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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016 | Jun. 24, 2016
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Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | $ 350,000,000 | $ 350,000,000 |
Derivative assets, Estimated Fair Value | 3,581,000 | 3,867,000 |
Fair Value of Assets | 3,581,000 | 3,867,000 |
Fair Value of Assets |  | 3,867,000 |
Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 150,000,000 |  | $ 150,000
Cash Flow Hedge | Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 150,000,000 | 150,000,000 |
Fair Value of Assets | 3,581,000 | 3,867,000 |
Freestanding Derivatives | Interest Rate Cap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | $ 200,000,000 | $ 200,000,000 |

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