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Income Per Share - Additional Information (Detail) - Common Stock [Member] - shares |  | 12 Months Ended
--- | --- | ---
Mar. 24, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Shares issued |  | 4,059,000 | 3,097,200 | 2,500,000
Subsequent Event [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Shares issued | 3,125,000 |  |  |
Over-Allotment Option [Member] | Subsequent Event [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Shares issued | 468,750 |  |  |

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