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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($) | Sep. 30, 2019 | May 09, 2019 | Dec. 31, 2018
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Derivative Instruments Gain Loss [Line Items] |  |  |
Fair Value of Assets | $ 982,000 |  | $ 8,307,000
Fair Value of Liabilities | 12,415,000 |  |
Cash Flow Hedge |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 400,000,000 |  | 400,000,000
Fair Value of Assets | 982,000 |  |
Fair Value of Liabilities | 12,415,000 |  |
Fair Value of Assets |  |  | 8,307,000
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 | 982,000 |  | 4,751,000
Cash Flow Hedge | Interest Rate Collar |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 250,000,000 |  | 250,000,000
Fair Value of Assets |  |  | $ 3,556,000
Fair Value of Liabilities | 6,617,000 |  |
Cash Flow Hedge | Forward Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount |  | $ 150,000,000 |
Fair Value of Liabilities | $ 5,798,000 |  |

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