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Schedule of Dividends & Distributions Declared (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2020 | Jun. 30, 2020 | Jun. 07, 2020 | Mar. 31, 2020 | Feb. 09, 2020 | Oct. 02, 2019 | Sep. 15, 2019 | Jun. 28, 2019 | Jun. 02, 2019 | Mar. 29, 2019 | Feb. 10, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval Date |  | Sep. 13, 2020 |  | Jun. 07, 2020 |  | Feb. 09, 2020 |  | Sep. 15, 2019 |  | Jun. 02, 2019 |  | Feb. 10, 2019 |  |
Record Date |  | Sep. 25, 2020 |  | Jun. 23, 2020 |  | Mar. 24, 2020 |  | Sep. 26, 2019 |  | Jun. 21, 2019 |  | Mar. 22, 2019 |  |
Payment Date |  | Sep. 30, 2020 |  | Jun. 30, 2020 |  | Mar. 31, 2020 |  | Oct. 02, 2019 |  | Jun. 28, 2019 |  | Mar. 29, 2019 |  |
Payment of dividends |  | $ 3,552 | $ 3,545 |  | $ 3,539 |  | $ 3,528 |  | $ 3,525 |  | $ 3,521 |  | $ 10,973 | $ 10,765
Unvested Shares, Net of Forfeitures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval Date |  |  |  |  |  |  |  |  |  |  |  |  | Various | Various
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Various | Various
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Various | Various
Payment of dividends | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 337 | $ 191
[1] | Represents dividends declared on unvested shares, net of forfeitures.

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