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Schedule II Financial Information of Registrant Parent Company Only Financial Information (Details) $ in Thousands | 1 Months Ended | 2 Months Ended | 7 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2015 USD ($) transaction basispoint | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) transaction basispoint | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | May. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Nov. 30, 2010 | Nov. 15, 2010 USD ($) | Jun. 01, 2005 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  | $ 4,298,686 | $ 3,629,299 |  | $ 4,298,686 | $ 3,629,299 |  |  |  |  |  |
Fixed-maturities available for sale—at fair value (amortized cost $1,893,356 and $528,660) |  |  | 1,865,461 | 536,890 |  | 1,865,461 | 536,890 |  |  |  |  |  |
Short-term investments—at fair value |  |  | $ 1,076,944 | 1,300,872 |  | 1,076,944 | 1,300,872 |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  | 156,172 | 57,223 | $ 79,372 |  |  |  |  |
Issuance of common stock |  |  |  |  |  | 1,285 | 247,188 | 299,410 |  |  |  |  |
Payments to Acquire Notes Receivable |  |  |  |  |  | $ 208,500 |  |  |  |  |  |  |
Surplus Note, Redemption Percentage |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |  |
Surplus Note, Amount Used in Calculation of Additional Redemption Allowed |  |  | $ 150,000 |  |  | $ 150,000 |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  |  | $ 75,430 | 143,368 |  | $ 75,430 | 143,368 |  |  |  |  |  |
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction |  |  | 2 |  |  | 2 |  |  |  |  |  |  |
Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 350,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25% |  |  | 5.25% |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Proceeds/payments related to issuance or exchange of debt, net |  |  | $ 343,300 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 350,000 |  |  | $ 350,000 |  |  |  |  |  |  |
Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.00% |  |  | 9.00% |  |  |  |  |  |  |
Senior Notes Due 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  | (2,800) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  | 57,200 |  |  |  |  |  |
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of long-term debt | 389,100 |  |  |  |  | $ 389,100 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.00% |  |  | 3.00% |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | $ (52,300) |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2017 | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 450,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.00% |  |
Proceeds/payments related to issuance or exchange of debt, net |  | $ 391,300 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  | 9.75% |  |
Long-term Debt, Gross |  |  | $ 52,370 | 450,000 |  | $ 52,370 | 450,000 |  |  |  |  |  |
Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.25% |  |  | 2.25% |  |  |  |  |  |  |
Convertible Senior Notes Due 2019 | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 2.25% |  |  |
Proceeds/payments related to issuance or exchange of debt, net |  |  |  |  | $ 389,800 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 6.25% |  |  |
Long-term Debt, Gross |  |  | $ 389,992 | $ 400,000 |  | $ 389,992 | 400,000 |  |  |  |  |  |
Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.50% |  |  | 5.50% |  |  | 5.50% |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Number of Basis Points Added to Treasury Rate Used in Calculating Redemption Price of Debt | basispoint |  |  | 50 |  |  | 50 |  |  |  |  |  |  |
Proceeds/payments related to issuance or exchange of debt, net |  |  |  | $ 293,800 |  |  |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  | $ 230,826 | 637,381 |  | $ 230,826 | 637,381 |  |  |  |  |  |
Fixed-maturities available for sale—at fair value (amortized cost $1,893,356 and $528,660) |  |  | 41,176 | 0 |  | 41,176 | 0 |  |  |  |  |  |
Short-term investments—at fair value |  |  | 158,658 | 631,934 |  | 158,658 | 631,934 |  |  |  |  |  |
Interest Income, Related Party |  |  |  |  |  | 17,700 | 8,900 |  |  |  |  |  |
Notes Receivable, Related Parties |  |  | 300,000 | 300,000 |  | 300,000 | 300,000 |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Funds Included In Short Term Investments |  |  |  | 45,100 |  |  | 45,100 |  |  |  |  |  |
Restricted Cash Held As Collateral For Insurance Trust Agreement |  |  | 100 | 100 |  | 100 | 100 |  |  |  |  |  |
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company |  |  |  |  |  | 84,700 | 92,500 | 140,000 |  |  |  |  |
Dividends Received From Consolidated Subsidiaries |  |  |  |  |  | 446,200 |  | 7,600 |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) |  |  |  |  |  | 398,300 | 139,100 | 313,900 |  |  |  |  |
Proceeds from Contributions from Affiliates |  |  |  |  |  | 113,784 | 0 | 0 |  |  |  |  |
Tax Payments to Parent from Subsidiaries |  |  |  |  |  | 16,000 | 8,800 | 500 |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  | 156,172 | 57,223 | 79,372 |  |  |  |  |
Issuance of common stock |  |  |  |  |  | 1,285 | 247,188 | 299,410 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 247,871 |  |  | 247,871 |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  | 350,000 |  |  | 350,000 |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 689,992 |  |  | 689,992 |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 1,287,863 |  |  | $ 1,287,863 |  |  |  |  |  |  |
Related Party Transaction, Rate |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  |  | 25,510 | 0 |  | $ 25,510 | 0 |  |  |  |  |  |
Qualified Deposit With The U.S. Department Of Treasury Relating To Prior Examinations |  |  | 89,000 |  |  | 89,000 |  |  |  |  |  |  |
Radian Guaranty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer from Investments |  |  |  |  |  | 116,500 |  |  |  |  |  |  |
Surplus Notes |  |  | 325,000 |  |  | 325,000 |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance |  |  | 1,686,500 | $ 1,325,200 | $ 1,317,800 | 1,686,500 | $ 1,325,200 | 1,317,800 |  |  |  |  |
Radian Reinsurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance |  |  | 138,700 |  |  | 138,700 |  |  |  |  |  |  |
Radian Mortgage Guaranty Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required |  |  | 20,000 |  |  | 20,000 |  |  |  |  |  |  |
Radian Mortgage Assurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required |  |  | 5,000 |  |  | 5,000 |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance |  |  | 8,100 |  |  | 8,100 |  |  |  |  |  |  |
Risk In Force |  |  | 0 |  |  | 0 |  |  |  |  |  |  |
Radian Mortgage Insurance Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance |  |  | $ 2,800 |  |  | $ 2,800 |  |  |  |  |  |  |
Debt Due 2015 Exchange | Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.00% |  |  | 9.00% |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  | (4,000) |  |  |  |  |
Debt Due 2015 Exchange | Senior Notes Due 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of long-term debt |  |  |  |  |  |  |  | 195,500 |  |  |  |  |
Guaranteed Structured Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction |  |  | 2 |  |  | 2 |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  | $ 119,200 |  |  | $ 119,200 |  |  |  |  |  |  |
Enhance Financial Services Group, Inc. [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer to Investments |  |  |  |  |  | 216,000 |  |  |  |  |  |  |
Radian MI Services Inc. [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  |  | $ 20,000 | 2,900 |  |  |  |  |
Proceeds from Contributions from Affiliates |  |  |  |  |  | 15,000 |  |  |  |  |  |  |
Radian Mortgage Reinsurance [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  | 200 | 100 | 100 |  |  |  |  |
Radian Clayton Holdings Inc. [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  | 12,100 | 19,000 |  |  |  |  |  |
Radian Mortgage Guaranty Inc. [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  | 20,000 |  |  |  |  |  |  |
Radian Reinsurance [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) |  |  |  |  |  | 266,000 |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Transfer from Investments |  |  |  |  |  | 216,000 |  |  |  |  |  |  |
Radian Guaranty [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  |  |  |  |  | 100,000 | $ 100,000 | 230,400 |  |  |  |  |
Cash Distributed From Parent to Consolidated Subsidiary |  |  |  |  |  |  |  | 400 |  |  |  |  |
RDN Investments [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Received From Consolidated Subsidiaries |  |  |  |  |  | 215,200 |  |  |  |  |  |  |
Transfer from Investments |  |  |  |  |  |  |  | $ 80,500 |  |  |  |  |
Transfer to Investments |  |  |  |  |  | 116,500 |  |  |  |  |  |  |
Proceeds from Contributions from Affiliates |  |  |  |  |  | $ 98,700 |  |  |  |  |  |  |

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