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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 14,665	$ 14,693
Interest Rate Swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets	3,816	7,529
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	3,816	7,529
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	0	1,860
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 3,816	$ 5,669

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