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Financial Guarantees in Force - Summary of International Finance Guaranteed Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding $ 223,633,000 $ 272,504,000
International Finance [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 38,256,000 40,542,000
International Finance [Member] | United Kingdom [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 22,585,000 22,317,000
International Finance [Member] | Australia [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 4,820,000 5,176,000
International Finance [Member] | Italy [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 3,068,000 3,346,000
International Finance [Member] | Austria [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 943,000 956,000
International Finance [Member] | Germany [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 598,000 619,000
International Finance [Member] | Internationally diversified [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding 3,968,000 5,318,000
International Finance [Member] | Other international [Member]
    
Guarantor Obligations [Line Items]    
Net Par Amount Outstanding $ 2,274,000 $ 2,810,000