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Investment Securities - Summary of Transfers between Level 1 and Level 2 (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 17,746   
Corporate debt securities [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 16,745   
Foreign corporate debt securities [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 $ 1,001