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Financial Guarantees in Force - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
California [Member]
Dec. 31, 2012
New York [Member]
Dec. 31, 2012
Florida [Member]
Dec. 31, 2012
No other state [Member]
Maximum [Member]
Guarantor Obligations [Line Items]            
Gross par amount of financial guarantees outstanding $ 245,030,000 $ 296,463,000        
Net par amount of financial guarantees 223,633,000 272,504,000        
Gross financial guarantees in force 385,803,000 474,305,000        
Net financial guarantees in force $ 350,163,000 $ 433,484,000        
Aggregate net par amounts in force     14.40% 6.40% 5.00% 5.00%
Highest single insured risk of aggregate net par amount guaranteed 1.30%