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Financial Guarantees in Force - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
California [Member]
Dec. 31, 2013
New York [Member]
Dec. 31, 2013
No other state [Member]
Maximum [Member]
Guarantor Obligations [Line Items]          
Gross par amount of financial guarantees outstanding $ 197,691,000 $ 245,030,000      
Net par amount of financial guarantees 179,092,000 223,633,000      
Gross financial guarantees in force 312,710,000 385,803,000      
Net financial guarantees in force $ 282,210,000 $ 350,163,000      
Aggregate net par amounts in force     14.30% 6.50% 5.00%
Highest single insured risk of aggregate net par amount guaranteed 1.50%