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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 12,092	$ 14,172
Interest Rate Swaps
Offsetting Liabilities [Line Items]
Gross Amount of Recognized Liabilities	8,400	9,825
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	8,400	9,825
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	8,262	4,472
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 138	$ 5,353

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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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