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Offsetting of Derivative Assets (Detail) (Foreign exchange contract, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Foreign exchange contract
   
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 7,131 $ 4,158
Gross Amounts Offset in the Statements of Financial Position      
Net Amounts Of Assets Presented In the Statements of Financial Position 7,131 4,158
Gross Amounts Not Offset in the Statements of Financial Position, Financial Instruments (4,731) (3,227)
Gross Amounts Not Offset in the Statements of Financial Position, Cash Collateral Pledged      
Net Amount $ 2,400 $ 931