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Remaining Maturities of Short Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Short-term debt $ 1,718,430 $ 862,763
Within 30 Days
    
Short-term Debt [Line Items]    
Short-term debt 1,069,160 659,262
31 to 90 Days
    
Short-term Debt [Line Items]    
Short-term debt 186,227 54,434
Over 90 Days
    
Short-term Debt [Line Items]    
Short-term debt $ 463,043 $ 149,067