Borrowings by contractual maturities (Detail) (Long-term Debt [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Long-term Debt [Member]
Debt Disclosure [Line Items]
Debt Maturities Repayments Of Principal In Year One	$ 328,917
Debt Maturities Repayments Of Principal In Year Two	250,966
Debt Maturities Repayments Of Principal In Year Three	82,983
Debt Maturities Repayments Of Principal In Year Four	106,934
Debt Maturities Repayments Of Principal In Year Five	463,270
Later years	478,758
Debt With No Stated Maturity	0
Borrowed Funds	$ 1,711,828

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Amount of borrowings maturing in year five following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowings maturing in year four following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowings maturing in year one following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowings maturing in year three following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowins maturing in year two following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowings maturing after year five following the date of the latest balance sheet presented in the financial statements.

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Amount of borrowings with no stated maturities as of the date of the latest balance sheet presented in the financial statements.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations.

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