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Share Repurchase Plan - Additional Information (Detail) - $ / shares |  | 6 Months Ended | 126 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2022 | May 31, 2022 | May 31, 2021 | May 31, 2022 | Nov. 30, 2021 | Oct. 06, 2016 | Apr. 08, 2015 | Jun. 06, 2012 | Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  |  | 8,000,000 | 6,000,000 | 3,000,000 | 1,000,000
Share repurchase plan |  | open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission |  |  |  |  |  |  |
Treasury stock, shares |  | 6,276,282 |  | 6,276,282 | 6,113,956 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock, shares |  | 6,276,282 |  | 6,276,282 |  |  |  |  |
Repurchase agreement, purchase price per share |  | $ 8.78 |  | $ 3.54 |  |  |  |  |
Number of shares repurchased |  | 162,326 | 0 |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Repurchase agreement, purchase price per share | $ 6.10 |  |  |  |  |  |  |  |
Number of shares repurchased | 18,700 |  |  |  |  |  |  |  |

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