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Segment Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Number of reportable segments 2  
Financial guarantee [Member]
   
Segment Reporting Information [Line Items]    
Net investment income $ 83,829 $ 105,261
Interest expense 22,176 32,049
Financial Services [Member]
   
Segment Reporting Information [Line Items]    
Net investment income 1,211 6,799
Interest expense 989 1,790
Corporate and Other [Member]
   
Segment Reporting Information [Line Items]    
Net investment income 29 57
Interest expense $ 0 $ 0