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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 13,606	$ 9,752
Interest Rate Swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets	11,716	5,930
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	11,716	5,930
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral received	9,240	5,070
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 2,476	$ 860

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