DEI Information Document	9 Months Ended
	Sep. 30, 2013	Nov. 06, 2013
Document Information [Line Items]
Entity Registrant Name	Radian Group Inc.
Entity Central Index Key	0000890926
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		173,099,515
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes