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Schedule of Dividends & Distributions Declared (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2022 | Dec. 08, 2022 | Oct. 11, 2022 | Sep. 23, 2022 | Jun. 30, 2022 | Jun. 02, 2022 | Mar. 31, 2022 | Mar. 03, 2022 | Dec. 31, 2021 | Dec. 04, 2021 | Sep. 30, 2021 | Sep. 11, 2021 | Jun. 30, 2021 | Jun. 05, 2021 | Mar. 31, 2021 | Feb. 14, 2021 | Dec. 31, 2020 | Dec. 06, 2020 | Sep. 30, 2020 | Sep. 13, 2020 | Jun. 30, 2020 | Jun. 07, 2020 | Mar. 31, 2020 | Feb. 09, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval Date |  | Dec. 08, 2022 |  | Sep. 23, 2022 |  | Jun. 02, 2022 |  | Mar. 03, 2022 |  | Dec. 04, 2021 |  | Sep. 11, 2021 |  | Jun. 05, 2021 |  | Feb. 14, 2021 |  | Dec. 06, 2020 | [1] |  | Sep. 13, 2020 | [1] |  | Jun. 07, 2020 | [2] |  | Feb. 09, 2020 | [2] |  |  |  |  |  |
Record Date |  | Dec. 23, 2022 |  | Oct. 04, 2022 |  | Jun. 20, 2022 |  | Mar. 21, 2022 |  | Dec. 20, 2021 |  | Sep. 23, 2021 |  | Jun. 21, 2021 |  | Mar. 22, 2021 |  | Dec. 24, 2020 |  |  | Sep. 25, 2020 |  |  | Jun. 23, 2020 |  |  | Mar. 24, 2020 |  |  |  |  |  |  |
Payment Date |  | Dec. 30, 2022 |  | Oct. 11, 2022 |  | Jun. 30, 2022 |  | Mar. 31, 2022 |  | Dec. 31, 2021 |  | Sep. 30, 2021 |  | Jun. 30, 2021 |  | Mar. 31, 2021 |  | Dec. 31, 2020 |  |  | Sep. 30, 2020 |  |  | Jun. 30, 2020 |  |  | Mar. 31, 2020 |  |  |  |  |  |  |
Payment of dividends | $ 3,389 |  | $ 3,616 |  | $ 3,602 |  | $ 3,597 |  | $ 3,587 |  | $ 3,583 |  | $ 3,579 |  | $ 3,570 |  | $ 3,558 |  |  | $ 3,552 |  |  | $ 3,545 |  |  | $ 3,539 |  |  | $ 14,543 |  | $ 14,578 |  | $ 14,645 |
Unvested Shares, Net of Forfeitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Various | [3] | Various | [4] | Various | [5]
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Various |  | Various |  | Various |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Various |  | Various |  | Various |
Payment of dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 339 |  | $ 259 |  | $ 451 |
[1] | Represents distribution / return of capital payments
[2] | Represents dividends payments
[3] | Represents distributions declared on unvested shares, net of forfeitures
[4] | Represents distributions declared on unvested shares, net of forfeitures
[5] | Represents dividends / distributions declared on unvested shares, net of forfeitures

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