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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 22, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Quarterly Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-11356    
Entity Registrant Name RADIAN GROUP INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-2691170    
Entity Address, Address Line One 550 East Swedesford Road    
Entity Address, Address Line Two Suite 350    
Entity Address, City or Town Wayne    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19087    
City Area Code 215    
Local Phone Number 231-1000    
Title of 12(b) Security Common Stock, $.001 par value per share    
Trading Symbol RDN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 3,243,257,456
Entity Common Stock, Shares Outstanding   157,192,928  
Documents Incorporated by Reference
 Form 10-K Reference Document
Definitive Proxy Statement for the Registrant’s 2023 Annual Meeting of StockholdersPart III (Items 10 through 14)
    
Entity Central Index Key 0000890926    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false