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Schedule II Financial Information of Registrant Parent Company Only Financial Information (Details) $ in Thousands	1 Months Ended		3 Months Ended									12 Months Ended
	Jun. 30, 2015 USD ($)	May 31, 2014 USD ($)	Dec. 31, 2017 USD ($) transaction	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) transaction subsidiaries	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jan. 27, 2017 USD ($)	Aug. 12, 2016 USD ($)
Condensed Financial Statements, Captions [Line Items]
Total Operating Expenses Allocated to Subsidiaries From Parent Company												$ 72,764	$ 56,446	$ 53,738
Total Interest Expense Allocated to Subsidiaries From Parent Company												44,686	52,092	35,300
Investments			$ 4,643,942				$ 4,462,430					4,643,942	4,462,430
Fixed-maturities available for sale—at fair value			3,458,719				2,838,512					3,458,719	2,838,512
Short-term investments—at fair value (includes $19,357 and $0 of reinvested cash collateral held under securities lending agreements)			415,658				741,531					415,658	741,531
Supplemental Notes [Abstract]
Loss on induced conversion and debt extinguishment (Note 12)			0	$ (45,766)	$ (1,247)	$ (4,456)	0		$ (17,397)	$ (2,108)	$ (55,570)	(51,469)	(75,075)	(94,207)
Repayments of Long-term Debt												593,527	445,072	156,172
Issuance of common stock												7,132	717	1,285
Available-for-sale Securities, Equity Securities			162,830				1,330					162,830	1,330
Qualified Deposit With The U.S. Department Of Treasury Relating To Prior Examinations			$ 88,557									$ 88,557
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction			2									2
Convertible Debt [Member]
Supplemental Notes [Abstract]
Loss on induced conversion and debt extinguishment (Note 12)													(17,200)
Senior Notes Due 2020 [Member]
Supplemental Notes [Abstract]
Debt Instrument, Face Amount	$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Proceeds/payments related to issuance or exchange of debt, net	$ 343,300
Senior Notes Due 2017
Supplemental Notes [Abstract]
Loss on induced conversion and debt extinguishment (Note 12)								$ (15,000)
Debt Instrument, Repurchased Face Amount																$ 195,500
Convertible Senior Notes Due 2017 [Member]
Supplemental Notes [Abstract]
Redemption of long-term debt	$ 389,100
Debt Instrument, Interest Rate, Stated Percentage			3.00%									3.00%
Convertible Senior Notes Due 2017 [Member] | Convertible Debt [Member]
Supplemental Notes [Abstract]
Long-term Debt, Gross			$ 0				22,233					$ 0	22,233
Debt Instrument, Repurchased Face Amount					$ 21,600		30,100						30,100
Convertible Senior Notes Due 2019 [Member]
Supplemental Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			2.25%									2.25%
Debt Instrument, Repurchased Face Amount															$ 68,000
Convertible Senior Notes Due 2019 [Member] | Convertible Debt [Member]
Supplemental Notes [Abstract]
Long-term Debt, Gross			$ 0				68,024					$ 0	68,024
Debt Instrument, Repurchased Face Amount							322,000						322,000
Senior Notes Due 2019 [Member]
Supplemental Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage		5.50%
Proceeds/payments related to issuance or exchange of debt, net		$ 293,800
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Restricted Cash Held As Collateral For Insurance Trust Agreement			0				100					0	100
Investments			94,141				390,754					94,141	390,754
Fixed-maturities available for sale—at fair value			10,785				79,336					10,785	79,336
Short-term investments—at fair value (includes $19,357 and $0 of reinvested cash collateral held under securities lending agreements)			83,356				311,418					83,356	311,418
Supplemental Notes [Abstract]
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company												117,450	108,538	89,038
Dividends Received From Consolidated Subsidiaries												26,500	40,400	446,200
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)												521,000	2,500	398,300
Payments to Acquire Interest in Subsidiaries and Affiliates												21,643	1,500	182,307
Proceeds from Contributions from Affiliates												924	15,000	113,784
Tax Payments to Parent from Subsidiaries												50,700	51,200	16,000
Loss on induced conversion and debt extinguishment (Note 12)												51,469	75,075	94,207
Repayments of Long-term Debt												593,527	445,072	156,172
Issuance of common stock												7,132	717	$ 1,285
Long-term Debt, Maturities, Repayments of Principal in Year Two			158,623									158,623
Long-term Debt, Maturities, Repayments of Principal after Year Five			450,000									450,000
Long-term Debt, Maturities, Repayments of Principal in Year Three			234,126									234,126
Long-term Debt, Maturities, Repayments of Principal in Year Four			197,661									197,661
Long-term Debt, Gross			1,040,410									$ 1,040,410
Related Party Transaction, Rate												0.00%		0.00%
Qualified Deposit With The U.S. Department Of Treasury Relating To Prior Examinations			88,600									$ 88,600
Parent Company [Member] | Convertible Senior Notes Due 2017 [Member]
Supplemental Notes [Abstract]
Debt Instrument, Repurchased Face Amount			21,600									21,600
Parent Company [Member] | Convertible Senior Notes Due 2019 [Member]
Supplemental Notes [Abstract]
Debt Instrument, Repurchased Face Amount			68,000									68,000
Clayton Group Holdings Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Notes Receivable, Related Parties			300,000				300,000					300,000	300,000
Interest Receivable			42,700									42,700
Allowance for Doubtful Accounts Receivable			42,700									42,700
Increase (Decrease) Due from Other Related Parties												39,900
Supplemental Notes [Abstract]
Payments for Capital Contributions to Wholly-Owned Subsidiaries												342,700
Transfer from Investments													1,000
Radian Guaranty [Member]
Supplemental Notes [Abstract]
Dividends Received From Consolidated Subsidiaries												175,000
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)												100,000
Payments for Capital Contributions to Wholly-Owned Subsidiaries														$ 100,000
Transfer from Investments												100,000
Transfer to Investments												153,600
Proceeds from Contributions from Affiliates												21,400
Surplus Notes			100,000				0					100,000	0	325,000
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance			1,201,000				1,349,700					$ 1,201,000	1,349,700	1,686,500
Radian Mortgage Insurance Inc., Radian Mortgage Reinsurance Company and RDN Investments, Inc. [Member]
Supplemental Notes [Abstract]
Number of Subsidiaries | subsidiaries												3
Radian Reinsurance [Member]
Supplemental Notes [Abstract]
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)												$ 175,000		266,000
Payments for Capital Contributions to Wholly-Owned Subsidiaries												21,400		50,000
Transfer from Investments												153,600		216,000
Statutory Accounting Practices, Statutory Capital and Surplus Required			20,000									20,000
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance			328,900				$ 147,600					328,900	147,600	138,700
Radian Mortgage Guaranty Inc. [Member]
Supplemental Notes [Abstract]
Payments for Capital Contributions to Wholly-Owned Subsidiaries														20,000
RDN Investments [Member]
Supplemental Notes [Abstract]
Dividends Received From Consolidated Subsidiaries												600		215,200
Payments for Capital Contributions to Wholly-Owned Subsidiaries													1,500
Transfer from Investments														116,500
Transfer to Investments													25,400
Proceeds from Contributions from Affiliates												500		98,700
Distribution of Deferred and Current Tax Recoverables												100
Radian MI Services Inc. [Member]
Supplemental Notes [Abstract]
Dividends Received From Consolidated Subsidiaries													5,000
Proceeds from Contributions from Affiliates														15,000
Radian Clayton Holdings Inc. [Member]
Supplemental Notes [Abstract]
Payments for Capital Contributions to Wholly-Owned Subsidiaries														12,100
Radian Insurance [Member]
Supplemental Notes [Abstract]
Payments to Acquire Interest in Subsidiaries and Affiliates													19,000
Radian Mortgage Reinsurance [Member]
Supplemental Notes [Abstract]
Dividends Received From Consolidated Subsidiaries												1,000
Payments for Capital Contributions to Wholly-Owned Subsidiaries														200
Proceeds from Contributions from Affiliates												600
Distribution of Deferred and Current Tax Recoverables												400
Enhance Financial Services Group, Inc. [Member]
Supplemental Notes [Abstract]
Payments for Capital Contributions to Wholly-Owned Subsidiaries												3,100
Transfer from Investments														$ 216,000
Proceeds from Contributions from Affiliates													15,000
Radian Mortgage Assurance [Member]
Supplemental Notes [Abstract]
Payments to Acquire Interest in Subsidiaries and Affiliates													8,600
Payments for Capital Contributions to Wholly-Owned Subsidiaries												200
Statutory Accounting Practices, Statutory Capital and Surplus Required			5,000									5,000
Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance			8,700									8,700
Risk In Force			$ 0									0
Radian Mortgage Insurance Inc [Member]
Supplemental Notes [Abstract]
Dividends Received From Consolidated Subsidiaries												24,900
Payments to Acquire Interest in Subsidiaries and Affiliates													$ 2,800
Proceeds from Contributions from Affiliates												2,700
Distribution of Deferred and Current Tax Recoverables												$ 22,200

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