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Borrowings by contractual maturities (Detail) (Long-term Debt [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Long-term Debt [Member]
 
Debt Disclosure [Line Items]  
2013 $ 98,831
2014 189,440
2015 41,107
2016 311,500
2017 103,139
Later years 534,234
Debt With No Stated Maturity 936,000
Subtotal 2,214,251
Less: Discount 436,530
Borrowed Funds $ 1,777,721