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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet $ 14,693 $ 9,752
Interest rate swaps    
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets 7,529 5,930
Gross Amounts Offset in the Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet 7,529 5,930
Financial Instruments 0 0
Cash Collateral Received 1,860 5,070
Net Amount $ 5,669 $ 860