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Schedule II Financial Information of Registrant Parent Company Only Financial Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
transaction
Dec. 31, 2017
USD ($)
subsidiaries
Dec. 31, 2016
USD ($)
Jan. 31, 2017
USD ($)
Jan. 27, 2017
USD ($)
Condensed Financial Statements, Captions [Line Items]                  
Total Operating Expenses Allocated to Subsidiaries From Parent Company         $ 94,815 $ 72,764 $ 56,446    
Total Interest Expense Allocated to Subsidiaries From Parent Company         42,195 44,686 52,092    
Total investments $ 4,643,942       5,153,029 4,643,942      
Fixed-maturities available for sale—at fair value 3,458,719       4,021,575 3,458,719      
Short-term investments—at fair value (includes $11,699 and $19,357 of reinvested cash collateral held under securities lending agreements) 415,658       528,403 415,658      
Supplemental Notes [Abstract]                  
Loss on induced conversion and debt extinguishment (Note 12) 0 $ (45,766) $ (1,247) $ (4,456) 0 (51,469) (75,075)    
Repayments of Long-term Debt         0 593,527 445,072    
Issuance of common stock         1,385 7,132 717    
Reductions in Other Assets, Amount         107,100        
Available-for-sale Securities, Equity Securities 162,830         162,830      
Additions to Other Assets, Amount         $ 28,700        
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction         2        
Convertible Senior Notes Due 2017 | Convertible Debt                  
Supplemental Notes [Abstract]                  
Debt Instrument, Repurchased Face Amount 0   21,600     0 30,100    
Convertible Senior Notes Due 2019 | Convertible Debt                  
Supplemental Notes [Abstract]                  
Debt Instrument, Repurchased Face Amount 0         0 322,000   $ 68,000
Parent Company                  
Condensed Financial Statements, Captions [Line Items]                  
Total investments 94,141       $ 644,972 94,141      
Fixed-maturities available for sale—at fair value 10,785       321,401 10,785      
Short-term investments—at fair value (includes $11,699 and $19,357 of reinvested cash collateral held under securities lending agreements) 83,356       238,185 83,356      
Supplemental Notes [Abstract]                  
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company         137,010 117,450 108,538    
Dividends Received From Consolidated Subsidiaries           26,500      
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)         98,100 521,000      
Payments to Acquire Interest in Subsidiaries and Affiliates         30,338 21,643 1,500    
Proceeds from Contributions from Affiliates         0 924 15,000    
Tax Payments to Parent from Subsidiaries         229,600 50,700      
Loss on induced conversion and debt extinguishment (Note 12)         0 51,469 75,075    
Repayments of Long-term Debt         0 593,527 445,072    
Issuance of common stock         1,385 7,132 717    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months         158,623        
Long-term Debt, Maturities, Repayments of Principal in Year Two         234,126        
Long-term Debt, Maturities, Repayments of Principal in Year Three         197,661        
Long-term Debt, Maturities, Repayments of Principal after Year Five         450,000        
Long-term Debt, Gross         1,040,410        
Available-for-sale Securities, Equity Securities 0         0      
Parent Company | Convertible Senior Notes Due 2017 | Convertible Debt                  
Supplemental Notes [Abstract]                  
Debt Instrument, Repurchased Face Amount     $ 21,600            
Parent Company | Convertible Senior Notes Due 2019 | Convertible Debt                  
Supplemental Notes [Abstract]                  
Debt Instrument, Repurchased Face Amount               $ 68,000  
Radian Title Services Inc.                  
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries         30,300        
Enhance Financial Services Group, Inc.                  
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries         1,700        
Transfer from Investments           3,100      
Clayton Group Holdings Inc.                  
Condensed Financial Statements, Captions [Line Items]                  
Notes Receivable, Related Parties 300,000       300,000 300,000      
Interest Receivable 42,700         42,700      
Allowance for Doubtful Accounts Receivable 42,700       60,500 42,700      
Increase (Decrease) Due from Other Related Parties         13,000        
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries         66,100        
Transfer from Investments           342,700      
Radian Guaranty                  
Supplemental Notes [Abstract]                  
Dividends Received From Consolidated Subsidiaries         450,000 175,000      
Transfer from Investments           100,000      
Transfer to Investments         394,600 153,600      
Proceeds from Contributions from Affiliates         55,400        
Surplus Notes 100,000       100,000 100,000      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 1,201,000       814,100 $ 1,201,000 1,349,700    
Radian Mortgage Insurance Inc., Radian Mortgage Reinsurance Company and RDN Investments, Inc. [Member]                  
Supplemental Notes [Abstract]                  
Number of Subsidiaries | subsidiaries           3      
Radian Reinsurance                  
Supplemental Notes [Abstract]                  
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)           $ 175,000      
Payments for Capital Contributions to Wholly-Owned Subsidiaries           21,400      
Transfer from Investments           153,600      
Statutory Accounting Practices, Statutory Capital and Surplus Required         20,000        
Statutory Accounting Practices, Statutory Capital and Surplus, Balance $ 328,900       356,200 328,900 $ 147,600    
RDN Investments                  
Supplemental Notes [Abstract]                  
Dividends Received From Consolidated Subsidiaries           600      
Proceeds from Contributions from Affiliates           500      
Distribution of Deferred and Current Tax Recoverables           100      
Radian Mortgage Reinsurance                  
Supplemental Notes [Abstract]                  
Dividends Received From Consolidated Subsidiaries           1,000      
Proceeds from Contributions from Affiliates           600      
Distribution of Deferred and Current Tax Recoverables           400      
Radian Mortgage Assurance                  
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries           200      
Statutory Accounting Practices, Statutory Capital and Surplus Required         5,000        
Statutory Accounting Practices, Statutory Capital and Surplus, Balance         8,700        
Risk In Force         $ 0        
Radian Mortgage Insurance Inc                  
Supplemental Notes [Abstract]                  
Dividends Received From Consolidated Subsidiaries           24,900      
Proceeds from Contributions from Affiliates           2,700      
Distribution of Deferred and Current Tax Recoverables           $ 22,200      
Indirect Guarantee of Indebtedness                  
Supplemental Notes [Abstract]                  
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction         2        
Guarantor Obligations, Maximum Exposure, Undiscounted         $ 87,800        
Internal Revenue Service (IRS)                  
Supplemental Notes [Abstract]                  
Qualified Deposit With The U.S. Department Of Treasury Relating To Prior Examinations         88,600        
Five Bridges | Clayton Group Holdings Inc.                  
Condensed Financial Statements, Captions [Line Items]                  
Increase (Decrease) Due from Other Related Parties         8,500        
REMIC Residual | Internal Revenue Service (IRS)                  
Supplemental Notes [Abstract]                  
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Submitted         31,000        
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Refunded         58,000        
Impairment on Intercompany Interest Receivable | Clayton Group Holdings Inc.                  
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries         17,800        
Intercompany Receivable | Clayton Group Holdings Inc.                  
Supplemental Notes [Abstract]                  
Payments for Capital Contributions to Wholly-Owned Subsidiaries         48,300        
Allowance for Notes, Loans and Financing Receivable, Current         $ 48,300