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Share Repurchase Plan - Additional Information (Detail) - $ / shares | 6 Months Ended | 138 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2023 | May 31, 2022 | May 31, 2023 | Nov. 30, 2022 | 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 | 6,560,832 |  | 6,560,832 | 6,347,490 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares | 6,560,832 |  | 6,560,832 |  |  |  |  |
Repurchase agreement, purchase price per share | $ 3.71 | $ 8.78 | $ 3.57 |  |  |  |  |
Number of shares repurchased | 213,342 | 162,326 |  |  |  |  |  |

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