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Derivative Financial Instruments - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 09, 2019 | Oct. 17, 2018 | Nov. 17, 2017 | Jun. 24, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2018 | Jan. 04, 2018 | Nov. 20, 2017 | Apr. 17, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, strike rate for the interest rate swap contract |  |  |  | 1.145% |  |  |  |  |  |  |  | 1.1325%
Realized gains (losses) on interest rate hedges reclassified to earnings |  |  |  |  |  | $ 1,139,000 | $ 1,372,000 | $ (107,000) |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Secured credit facility borrowing capacity |  |  | $ 100,000,000 |  |  |  |  |  |  |  | $ 100,000,000 |
Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 400,000,000 | 400,000,000 |  |  |  |  |
Derivative, strike rate for the forward interest rate swap contract | 2.176% |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge | Other Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognition of hedge ineffectiveness |  |  |  |  |  |  |  | $ 94,000 |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
Derivative, maturity date |  |  |  | Jun. 17, 2021 |  |  |  |  |  |  |  |
Recognition of hedge ineffectiveness |  |  |  |  |  | 0 |  |  |  |  |  |
Interest Rate Swap | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 150,000,000 | 150,000,000 |  |  |  |  |
Interest Rate Collar | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 100,000,000 | $ 100,000,000 |  |  | $ 250,000,000 | $ 250,000,000 |  | $ 150,000,000 |  |  |
Derivative, maturity date |  | Jan. 17, 2024 | Nov. 17, 2024 |  |  |  |  |  |  |  |  |
Interest rate cap strike rate |  | 2.50% | 2.00% |  |  |  |  |  |  |  |  |
Floor interest rate |  | 2.25% | 1.25% |  |  |  |  |  |  |  |  |
Interest Rate Collar | Cash Flow Hedge | Designated |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Interest Rate Collar | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Interest Rate Collar | Cash Flow Hedge | Designated |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Forward Interest Rate Swap | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, maturity date | Jun. 17, 2026 |  |  |  |  |  |  |  |  |  |  |
Derivative, effective date | Jun. 17, 2021 |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps and Caps | Cash Flow Hedge | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassified out of accumulated other comprehensive income to earnings, amount |  |  |  |  | $ 1,478,000 |  |  |  |  |  |  |

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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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