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Schedule II Financial Information of Registrant Parent Company Only Supplemental Notes (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) transaction | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Total Operating Expenses Allocated to Subsidiaries From Parent Company | $ 124,412 | $ 94,815 | $ 72,764
Total Interest Expense Allocated to Subsidiaries From Parent Company | 53,692 | 42,195 | 44,686
Parent Company |  |  |
Supplemental Notes [Abstract] |  |  |
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company | 178,104 | 137,010 | 117,450
Deferred Income Tax Liabilities, Net | 253,739 | 243,341 |
Radian Mortgage Assurance |  |  |
Supplemental Notes [Abstract] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required | 5,000 |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 8,800 |  |
Risk In Force | 0 |  |
Radian Guaranty |  |  |
Supplemental Notes [Abstract] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 637,700 | 814,100 | $ 1,201,000
Clayton Group Holdings Inc. |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  | 66,100 |
Indirect Guarantee of Indebtedness | Radian Guaranty |  |  |
Supplemental Notes [Abstract] |  |  |
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction | 2 |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 79,300 |  |
Impairment on Intercompany Interest Receivable | Clayton Group Holdings Inc. |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  | 17,800 |
Intercompany Receivable | Clayton Group Holdings Inc. |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments for Capital Contributions to Wholly-Owned Subsidiaries |  | $ 48,300 |

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