Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Asset-backed securities [Member] Asset-backed Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Amortized Cost, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized Cost, Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Amortized Cost, Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Amortized Cost, Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost, Total Investments Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Fair Value, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Fair Value, Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Fair Value, Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Fair Value Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Fair Value, Total Investments Available-for-sale Securities Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] FBR Capital Markets and Co. [Member] FBR Capital Markets and Co. [Member] FBR Capital Markets and Co. [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Line of Credit [Member] Line of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility, borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Exercise price of warrants Class of Warrant or Right, Exercise Price of Warrants or Rights Warrants issued Class of Warrant or Right, Number of Securities Called by Warrants or Rights Warrants value Warrants and Rights Outstanding Gain (Loss) from change in fair value of warrant liability Gain (Loss) on Change in Fair Value of Warrant Liability Gain (Loss) on Change in Fair Value of Warrant Liability Equity [Abstract] Common Stock Offering Stockholders' Equity Note Disclosure [Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Common Class B [Member] Common Class B [Member] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets [Abstract] Investments, available-for-sale, at fair value: Marketable Securities, Fixed Maturities [Abstract] Fixed maturities (amortized cost of $419,021,671 and $0 as of September 30, 2013 and December 31, 2012, respectively) Available-for-sale Securities, Debt Securities Short-term investments Short-term Investments Total investment portfolio Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accrued investment income Accrued Investment Income Receivable Prepaid expenses Prepaid Expense Restricted cash Restricted Cash and Cash Equivalents Deferred policy acquisition costs, net Deferred Policy Acquisition Costs Goodwill and other intangible assets Intangible Assets, Net (Including Goodwill) Software and equipment, net Property, Plant and Equipment, Net Other assets Other Assets Total Assets Assets Liabilities Liabilities [Abstract] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Placement fee payable Placement Fee Payable Placement Fee Payable Purchase consideration payable Business Combination, Contingent Consideration, Liability Warrant liability Warrant Liability Warrant Liability Deferred tax liability Other Liabilities Total Liabilities Liabilities Commitments and Contingencies Commitments and Contingencies Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock, shares outstanding Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax Deficit accumulated during the development phase Retained Earnings (Accumulated Deficit) Total Shareholders' Equity Stockholders' Equity Attributable to Parent Total Liabilities and Shareholders' Equity Liabilities and Equity Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] The 2012 Stock Incentive Plan [Member] The 2012 Stock Incentive Plan [Member] The 2012 Stock Incentive Plan [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock Options [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Projected forfeiture rates Share Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Share Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] MAC Financial Holding Corporation and Subsidiaries [Member] MAC Financial Holding Corporation and Subsidiaries [Member] MAC Financial Holding Corporation and Subsidiaries [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common stock offered and sold, (in shares) Stock Issued During Period, Shares, New Issues Underwriting fee and other offering expense Proceeds from Issuance Initial Public Offering, Net Proceeds from Issuance Initial Public Offering, Net Net stock issuance proceeds (percent) Stock Issued During Period, Net Proceeds Percentage Placed in Investment Accounts Stock Issued During Period, Net Proceeds Percentage Placed in Investment Accounts Proceeds from issuance of common stock, net of stock issuance costs Proceeds From Issuance of Common Stock, Net of Stock Issuance Costs Proceeds From Issuance of Common Stock, Net of Stock Issuance Costs Repayments of long-term debt Repayments of Long-term Debt Cash placed in operating account through time of GSE Approval Cash Reserved For Funding Company Operations Cash Reserved For Funding Company Operations Purchaser discounts and placement fees Stock Issuance Costs, Purchaser Discounts and Placement Fees Stock Issuance Costs, Purchaser Discounts and Placement Fees Purchase discount and placement fees paid in common stock Stock Issuance Costs, Purchaser Discounts and Placement Fees paid in Common Stock Stock Issuance Costs, Purchaser Discounts and Placement Fees paid in Common Stock Purchase discount and placement fees paid in cash Stock Issuance Costs, Purchaser Discounts and Placement Fees, Paid in Cash Stock Issuance Costs, Purchaser Discounts and Placement Fees, Paid in Cash Proceeds from sale of common stock placed in escrow Proceeds from Sale of Common Stock, Escrow Deposit Proceeds from Sale of Common Stock, Escrow Deposit Business Combinations [Abstract] Schedule of Assets Acquired and Liabilities Assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accounting Policies [Abstract] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Investments Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Revenue Recognition Insurance Premiums Revenue Recognition, Policy [Policy Text Block] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs, Policy [Policy Text Block] Business Combinations, Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Software and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Warrants Warrants Policy [Policy Text Block] Warrants Policy [Policy Text Block] Share-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Offering and Incorporation Expenses Offering and Incorporation Expenses Policy [Policy Text Block] Offering and Incorporation Expenses Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Nonpublic Entity Disclosure about Financial Instruments Nonpublic Fair Value of Financial Instruments, Policy [Policy Text Block] Nonpublic Fair Value of Financial Instruments, Policy [Policy Text Block] Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Property, Plant and Equipment [Abstract] Schedule of Equipment and Software Property, Plant and Equipment [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies [Table] Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies [Table] Jurisdiction [Axis] Jurisdiction [Axis] Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] Fannie Mae [Member] Fannie Mae [Member] Fannie Mae [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] NMI Re One [Member] NMI Re One [Member] NMI Re One [Member] NMI Re Two [Member] NMI Re Two [Member] NMI Re Two [Member] Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] Minimum capitalization requirement period Minimum Capitalization Requirement Period Minimum Capitalization Requirement Period Capital required to be capitalized Statutory Accounting Practices, Initial Statutory Capital and Surplus Required Statutory Accounting Practices, Initial Statutory Capital and Surplus Required Minimum capital required Statutory Accounting Practices, Statutory Capital and Surplus Required Risk-to-capital Risk To Capital Ratio Regulatory Maximum Risk To Capital Ratio Regulatory Maximum Statutory capital and surplus required, period Statutory Accounting Practices, Statutory Capital and Surplus Required, Period Statutory Accounting Practices, Statutory Capital and Surplus Required, Period Statutory capital and surplus required, no declaration or dividend payment period Statutory Accounting Practices, Statutory Capital and Surplus Required, No Declaration or Dividend Payment Period Statutory Accounting Practices, Statutory Capital and Surplus Required, No Declaration or Dividend Payment Period Statutory capital and surplus required, requirement to not enter in capital support agreement period Statutory Accounting Practices, Statutory Capital and Surplus Required, Requirement to Not Enter in Capital Support Agreement Period Statutory Accounting Practices, Statutory Capital and Surplus Required, Requirement to Not Enter in Capital Support Agreement Period Statutory capital and surplus required, agreement to not enter in to reinsurance risk period Statutory Accounting Practices, Statutory Capital and Surplus Required, Agreement to Not Enter in to Reinsurance Risk Period Statutory Accounting Practices, Statutory Capital and Surplus Required, Agreement to Not Enter in to Reinsurance Risk Period Shareholder percent provision regarding underwriting policies Shareholder Percent Provision Regarding Underwriting Policies Shareholder Percent Provision Regarding Underwriting Policies Mortgage insurance pool agreement, number of loans Mortgage Insurance Pool Agreement, Number of Loans Mortgage Insurance Pool Agreement, Number of Loans Mortgage insurance pool agreement, aggregate unpaid principal balance Mortgage Insurance Pool Agreement, Aggregate Principal Balance Amount Outstanding Mortgage Insurance Pool Agreement, Aggregate Principal Balance Amount Outstanding Mortgage insurance pool agreement, expected term Mortgage Insurance Pool Agreement, Expected Term Mortgage Insurance Pool Agreement, Expected Term Pool risk-in-force Mortgage Insurance Risk In Force, Pool This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) for insurance written on a pool basis. In a pool policy, where a group of loans (or pool) are insured under a single contract. Pool insurance may have a stated aggregate loss limit for a pool of loans and may also have a deductible under which no losses are paid by the insurer until losses on the pool of loans exceed the deductible. Office facility lease, term of contract Lessee Leasing Arrangements, Operating Leases, Term of Contract Rent expense Operating Leases, Rent Expense, Net Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] [Domain] for Sale of Stock [Axis] IPO [Member] IPO [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Additional square feet of furnished office space under amended lease terms Additional Square Feet of Furnished Office Space under Amended Lease Terms Additional Square Feet of Furnished Office Space under Amended Lease Terms Underwriting offering period Underwriting Offering Period Underwriting Offering Period Maximum number of additional common stock shares granted to Underwriters of IPO Maximum Number of Common Stock Shares Granted to Underwriters of IPO Maximum Number of Common Stock Shares Granted to Underwriters of IPO Maximum number of common stock shares granted to underwriters of IPO, exercise price Maximum number of Common Stock Shares Granted to Underwriters of IPO, Exercise Price Maximum number of Common Stock Shares Granted to Underwriters of IPO, Exercise Price Gross proceeds from issuance of initial public offering Proceeds from Issuance Initial Public Offering Underwriting fee and other offering expense (percent) Stock Issued During Period, Underwriting Fee and Other Offering Expense, Percentage Stock Issued During Period, Underwriting Fee and Other Offering Expense, Percentage Acquisition of MAC Business Combination Disclosure [Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Schedule of Fair Values and Gross Unrealized Gains and Losses Available-for-sale Securities [Table Text Block] Schedule of Investments by Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Realized Investment (Losses) Gains on Investments Gain (Loss) on Investments [Table Text Block] Schedule of Aging Unrealized Losses Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of Net Investment Income Investment Income [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Expiration Period [Axis] Expiration Period [Axis] Expiration Period [Axis] Expiration Period [Domain] Expiration Period [Domain] [Domain] for Expiration Period [Axis] Annual Limitation Through Year Three [Member] Annual Limitation Through Year Three [Member] Annual Limitation Through Year Three [Member] Annual Limitations After Year Three [Member] Annual Limitations After Year Three [Member] Annual Limitations After Year Three [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Deferred tax liabilities, gross Deferred Tax Assets, Net Taxes paid related to net share settlement of equity awards Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Loss carry forwards subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Less: valuation allowance Deferred Tax Assets, Valuation Allowance Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Insurance Management System [Member] Insurance Management System [Member] Insurance Management System [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Capitalized software Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Depreciation and amortization Depreciation, Depletion and Amortization Estimated useful life Property, Plant and Equipment, Useful Life Statement of Cash Flows [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Net Loss Net Income (Loss) Attributable to Parent Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Share-based compensation expense Share-based Compensation Warrants issued in connection with line of credit Proceeds from Issuance of Warrants Loss from change in fair value of warrant liability Net realized investment gains Available-for-sale Securities, Gross Realized Gain (Loss) Loss on impairment Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Depreciation and other amortization Depreciation, Amortization and Accretion, Net Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Prepaid expense Increase (Decrease) in Prepaid Expense Deferred policy acquisition costs, net Increase (Decrease) in Deferred Policy Acquisition Costs Other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Net Cash Used in Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of short-term investments Payments to Acquire Short-term Investments Purchase of fixed maturities, available-for-sale Payments to Acquire Available-for-sale Securities, Debt Proceeds from maturity of short-term investments Proceeds from Sale of Short-term Investments Proceeds from sale of fixed maturities, available-for-sale Proceeds from Sale of Available-for-sale Securities, Debt Purchase of software and equipment Payments to Acquire Property, Plant, and Equipment Acquisition of subsidiaries Payments to Acquire Businesses, Net of Cash Acquired Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Payments on line of credit Repayments of Lines of Credit Taxes paid related to net share settlement of equity awards Payments Related to Tax Withholding for Share-based Compensation Issuance of common stock Proceeds from Issuance of Common Stock Net Cash (Used in) Provided by Financing Activities Net Cash Provided by (Used in) Financing Activities Net (Decrease) Increase in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, beginning of period Cash and Cash Equivalents, end of period Noncash Financing Activities Supplemental Cash Flow Information [Abstract] Restricted Cash Increase (Decrease) in Restricted Cash Noncash Financing Activities Noncash Investing and Financing Items [Abstract] Conversion of Class B shares of common stock into Class A shares of common stock Conversion of Stock, Amount Issued Acquisition of subsidiaries Other Noncash Investing and Financing Items [Abstract] Warrants issued in connection with acquisition of subsidiaries, Shares Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued Common stock issued in connection with acquisition of subsidiaries, Shares Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Insurance [Abstract] Statutory Information Insurance Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash, common stock and warrants issued for acquisition Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Liabilities assumed in acquisition Business Combination, Consideration Transferred, Liabilities Incurred Tax liabilities assumed in acquisition Business Combination, Consideration Transferred, Tax Liabilities Incurred Business Combination, Consideration Transferred, Tax Liabilities Incurred Common stock issue price (usd per share) Share Price Payments of stock issuance costs Payments of Stock Issuance Costs Antidilutive securities excluded from computation of earnings per share (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Primary risk-in-force Risk in Force Primary This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) for insurance writtten on a primary basis. Primary insurance may be written on a flow basis, in which loans are insured in individual, loan-by-loan transactions, or may be written on a bulk basis, in which each loan in a portfolio of loans is individually insured in a single, bulk transaction. Total risk-in-force Mortgage Insurance Risk in Force This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time). Statutory policyholders' position Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory contingency reserve Contingency Reserve Funds separated from retained earnings and held to cover any unforseen future business losses. Statutory Accounting Practices Statutory Policyholders Surplus Plus Contingency Reserves Statutory Accounting Practices Statutory Policyholders Surplus Plus Contingency Reserves Statutory Accounting Practices Statutory Policyholders Surplus Plus Contingency Reserves Risk to capital ratio Risk To Capital Ratio Regulatory Actual Risk To Capital Ratio Regulatory Actual Stock Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] U.S. Treasury securities and obligations of U.S. government agencies [Member] US Treasury and Government [Member] Municipal bonds [Member] US States and Political Subdivisions Debt Securities [Member] Corporate debt securities [Member] Corporate Debt Securities [Member] Fair Value, Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Unrealized Losses, Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments Fair Value, 12 Months or Greater Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized Losses, 12 Months or Greater Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments Fair Value, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments Restricted Stock Units [Member] Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted Stock beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted Stock Units Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Less: Restricted Stock Units Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Less: Restricted Stock Units Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted Stock beginning balance (in shares) Weighted Average Grant Date Fair Value per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Restricted Stock beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted Stock Units Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Less: Restricted Stock Units Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Less: Restricted Stock Units Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Restricted Stock ending balance (in dollars per share) Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] WISCONSIN [Member] WISCONSIN Subsidiaries [Member] Subsidiaries [Member] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Number of states which require minimum amount of statutory capital relative to risk in force Number of States Which Require Minimum Amount of Statutory Capital Relative to Risk In Force Number of States Which Require Minimum Amount of Statutory Capital Relative to Risk In Force Potential risk In force to capital, ratio Potential Risk In Force to Capital, Ratio Potential Risk In Force to Capital, Ratio Statutory capital and surplus required Mortgage insurance, percentage of indebtedness on single loan Mortgage Insurance, Percentage of Indebtedness on Single Loan, Limit Mortgage Insurance, Percentage of Indebtedness on Single Loan, Limit Shareholders' equity Ordinary dividends, restriction with regards to capital surplus Ordinary Dividends, Restriction with Regards to Capital Surplus This concept represents the maximum percentage of surplus as of the prior year that an insurer may pay out in ordinary dividends without prior approval of the Wisconsin Office of the Commissioner of Insurance under Wisconsin law. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Warrant Liability [Member] Warrant Liability [Member] Warrant Liability [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Volatility Assumption Fair Value Assumptions, Expected Volatility Rate Share Price (in dollars per share) Risk free rate Fair Value Assumptions, Risk Free Interest Rate Expected term Fair Value Assumptions, Expected Term Expected dividend rate Fair Value Assumptions, Expected Dividend Rate Software [Member] Software and Software Development Costs [Member] Equipment [Member] Equipment [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Property plant and equipment Property, Plant and Equipment, Gross Less accumulated amortization and depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options begninning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Less: Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options ending balance (in shares) Weighted Average Grant Date Fair Value per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Less: Options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options beginning balance (in dollars per share) Income Taxes Income Tax Disclosure [Text Block] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Cash and investments Cash, Cash Equivalents, and Short-term Investments Unrealized losses Net realized investment gains (losses) Line of Credit and Related Warrants Line of Credit and Related Warrants [Text Block] Line of Credit and Related Warrants [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Initial fair value of warrant liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Initial Fair Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Initial Fair Value Change in fair value of warrant liability included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) Ending balance Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional paid-in capital [Member] Additional Paid-in Capital [Member] Accumulated other comprehensive income (loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Deficit Accumulated During the Development Phase [Member] Retained Earnings [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance, Shares Common Stock, Shares, Outstanding Beginning Balance Issuance of shares of common stock, Shares Issuance of shares of common stock Stock Issued During Period, Value, New Issues Conversion of Class B shares of common stock into Class A shares of common stock, Shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of Class B shares of common stock into Class A shares of common stock Stock Issued During Period, Value, Conversion of Convertible Securities Issuance of common stock related to acquisition of subsidiaries, Shares Stock Issued During Period, Shares, Acquisitions Issuance of common stock related to acquisition of subsidiaries Stock Issued During Period, Value, Acquisitions Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition Change in unrealized investment gains/losses Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net loss Ending Balance, Shares Ending Balance Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] State licenses [Member] State Licenses [Member] State Licenses [Member] GSE Approvals [Member] GSE Approvals [Member] GSE Approvals [Member] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Schedule of Risk to Capital Statutory Accounting Practices Disclosure [Table Text Block] Schedule of Future Minimum Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Summary of Accounting Principles Significant Accounting Policies [Text Block] Litigation Legal Matters and Contingencies [Text Block] Income Statement [Abstract] Revenues Revenues [Abstract] Direct premiums written Direct Premiums Written Increase (decrease) in unearned premiums (Increase) Decrease in Unearned Premiums, Net Net premiums earned Premiums Written, Net Net investment income Net Investment Income Gain (Loss) from change in fair value of warrant liability Total Revenues Revenues Expenses Costs and Expenses [Abstract] Payroll and related Labor and Related Expense Share-based compensation Professional fees Professional Fees Information technology Information Technology and Data Processing Travel and related costs Travel and Entertainment Expense Rent and office expenses Operating Leases, Rent Expense Financial fees and interest expense Interest Expense Other Other Expenses Total Expenses Costs and Expenses Net Loss Share Data Earnings Per Share, Basic and Diluted [Abstract] Basic and Diluted loss per share (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average common shares (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Other Comprehensive Income (Loss) (net of tax) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized holding gains (losses) for the period included in accumulated other comprehensive income (loss) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss) (net of tax) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Short-term investments [Member] Short-term Investments [Member] Amortized Cost Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments Gross Unrealized (Losses) Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments Fair Value Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Number of escrow accounts, funds released upon GSE approval Number of Escrow Accounts, Funds Released Upon GSE Approval Number of Escrow Accounts, Funds Released Upon GSE Approval Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill Goodwill Subtotal Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Current liabilities and deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Estimated fair value of net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 2013 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2014 Operating Leases, Future Minimum Payments, Due in Two Years Totals Operating Leases, Future Minimum Payments Due Subsequent Events Subsequent Events [Text Block] Organization and Basis of Presentation Business Description and Basis of Presentation [Text Block] Fixed maturity, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common stock, shares authorized Common Stock, Shares Authorized Schedule of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Grant Date Fair Values of Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Grant Date Fair Value of Restricted Stock Units, Valuation Assumptions Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Fixed maturities [Member] Fixed Maturities [Member] Cash equivalents [Member] Cash and Cash Equivalents [Member] Other [Member] Other Long-term Investments [Member] Investment income Investment Income Gross Investment Income Gross Investment expenses Investment Income, Investment Expense Net Investment Income Investment Income, Net Warrant [Member] Warrant [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Operational Manuals [Member] Operational Manuals [Member] Operational Manuals [Member] Consideration paid Business Combination, Consideration Transferred Cash paid in acquisition Payments to Acquire Businesses, Gross Common stock issued in connection with acquisition of subsidiaries (in shares) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Cash deposited in escrow Business Acquisition, Cash Deposited in Escrow Business Acquisition, Cash Deposited in Escrow Operating manuals acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Number of shares authorized to be reserved for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Restricted stock vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock options, number of shares exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average remaining contractual life of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Total unrecognized compensation cost related to non-vested stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Compensation related to non-vested awards, weighted-average period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Modification to vesting terms, number of restricted stock units affected (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Shares Outstanding and Unvested Affected Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Shares Outstanding and Unvested Affected Restricted stock units outstanding (in shares) Vesting percentage subject to both market and service conditions, annual vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subeject to Both Market and Service Conditions, Annual Vesting Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subeject to Both Market and Service Conditions, Annual Vesting Percentage Number of simulations Number of Simulations Number of Simulations Restricted stock units outstanding, number of shares subject to both market and service conditions (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subeject to Both Market and Service Conditions, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subeject to Both Market and Service Conditions, Number Restricted stock units outstanding, number of shares subject to only service conditions (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subject to Only Service Conditions, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subject to Only Service Conditions, Number Weighted average remaining contractual life of RSUs outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Total unrecognized compensation cost related to non-vested restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Restricted stock units, number of shares containing a market condition vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Containing a Market Condition, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Containing a Market Condition, Vested in Period Acceleration of compensation expense Allocated Share-based Compensation Expense Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Intangible Assets Intangible Assets Disclosure [Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Available-for-sale Securities Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total Assets Assets, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Software and Equipment Property, Plant and Equipment Disclosure [Text Block] Deferred Tax Asset, Gross [Abstract] Deferred Tax Asset, Gross [Abstract] Deferred Tax Asset, Gross [Abstract] Capitalized start-up costs Deferred Tax assets, Capitalized Start-up Costs, Gross Deferred Tax assets, Capitalized Start-up Costs, Gross Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Gross Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Gross Unrealized loss on investments Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross, Tax Effected Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross, Tax Effected Net operating loss carry forwards Deferred Tax Assets, Operating Loss Carryforwards, Gross Deferred Tax Assets, Operating Loss Carryforwards, Gross Other Deferred Tax Assets, Other, Gross Deferred Tax Assets, Other, Gross Total gross deferred tax assets Deferred Tax Assets, Gross, BeforeTax Effected Deferred Tax Assets, Gross, BeforeTax Effected Less: valuation allowance Deferred Tax Assets, Valuation Allowance, Before Tax Effected Deferred Tax Assets, Valuation Allowance, Before Tax Effected Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Before Tax Effected Deferred Tax Assets, Net of Valuation Allowance, Before Tax Effected Deferred tax asset: Deferred Tax Assets, Gross [Abstract] Capitalized start-up costs Deferred Tax assets, Capitalized Start-up Costs Deferred Tax assets, Capitalized Start-up Costs Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Unrealized loss on investments Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Net operating loss carry forwards Deferred Tax Assets, Operating Loss Carryforwards Other Deferred Tax Assets, Other Total gross deferred tax assets Deferred Tax Assets, Gross Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liability, Gross [Abstract] Deferred Tax Liability, Gross [Abstract] Deferred Tax Liability, Gross [Abstract] Capitalized Software Deferred Tax Liabilities, Property, Plant and Equipment, Tax Effected Deferred Tax Liabilities, Property, Plant and Equipment, Tax Effected Intangible Assets Deferred Tax Liabilities, Intangible Assets, Tax Effected Deferred Tax Liabilities, Intangible Assets, Tax Effected Other Deferred Tax Liabilities, Other, Tax Effected Deferred Tax Liabilities, Other, Tax Effected Total deferred tax liabilities Deferred Tax Liabilities, Gross, Tax Effected Deferred Tax Liabilities, Gross, Tax Effected Net deferred income tax liability Deferred Tax Assets, Net, Tax Effected Deferred Tax Assets, Net, Tax Effected Deferred tax liability: Deferred Tax Liabilities, Gross [Abstract] Capitalized Software Deferred Tax Liabilities, Property, Plant and Equipment Intangible Assets Deferred Tax Liabilities, Intangible Assets Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred income tax liability