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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Liabilities and Derivative Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | $ 13,698 | $ 10,074
Interest Rate Swaps |  |
Offsetting Liabilities [Line Items] |  |
Gross Amount of Recognized Liabilities | 1,639 | 5,058
Gross Amounts Offset in the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet | 1,639 | 5,058
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 | 2 | 4,872
Gross amounts not offset in the consolidated balance sheet, Net amount | $ 1,637 | $ 186

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