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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Net amounts of liabilities presented in the consolidated balance sheet	$ 9,716us-gaap_DerivativeLiabilities	$ 3,537us-gaap_DerivativeLiabilities
Interest Rate Swaps
Offsetting Assets [Line Items]
Gross amount of recognized liabilities	9,703	3,191
Gross amounts offset in the consolidated balance sheet	0	0
Net amounts of liabilities presented in the consolidated balance sheet	9,703	3,191
Gross amounts not offset in the consolidated balance sheet, Financial instruments	192	392
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	9,511	2,799
Net amount	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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