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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Values of Derivative Instruments (Detail) - Cash Flow Hedge - USD ($) | Sep. 30, 2020 | Mar. 02, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional | $ 400,000,000 |  | $ 400,000,000
Fair Value of Assets |  |  | 953,000
Fair Value of Liabilities | 33,453,000 |  | 7,769,000
Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional | 150,000,000 |  | 150,000,000
Fair Value of Assets |  |  | 953,000
Fair Value of Liabilities | 1,056,000 |  |
Interest Rate Collar |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional | 250,000,000 |  | 250,000,000
Fair Value of Liabilities | 14,701,000 |  | 4,330,000
Forward Interest Rate Swap |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional |  | $ 150,000,000 |
Fair Value of Liabilities | $ 17,696,000 |  | $ 3,439,000

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