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Investment Securities - Summary of Transfers between Level 1 and Level 2 (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 12,067 7,135
Corporate Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 11,299 4,598
Foreign Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers from Level 1 to Level 2      
Transfers from Level 2 to Level 1 $ 768 $ 2,537