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Derivative financial instruments - Information About Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives $ 851 $ 4,189 $ 925 $ 4,374
Interest rate contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives 777 2,425 3,996 3,901
Foreign exchange and other option and futures contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives 74 1,764 (3,071) 473
Interest rate swap agreements [Member] | Fixed rate long-term borrowings [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives in fair value hedging relationships, derivatives 3,273 42,587 5,918 52,127
Derivatives in fair value hedging relationships, hedged item $ (3,252) $ (40,355) $ (5,876) $ (49,452)