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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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