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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 12,673	$ 10,074
Interest Rate Swaps
Offsetting Liabilities [Line Items]
Gross Amount of Recognized Liabilities	2,405	5,058
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	2,405	5,058
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral pledged	352	4,872
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 2,053	$ 186

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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