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Share Repurchase Plan - Additional Information (Detail) - $ / shares |  | 12 Months Ended | 108 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | 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 |  | 6,093,535 | 6,093,535 | 6,093,535 |  |  |  |
2012 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased | 292,449 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares |  | 6,093,535 |  | 6,093,535 |  |  |  |
Repurchase agreement, purchase price per share |  | $ 0.00 | $ 3.39 | $ 3.37 |  |  |  |
Number of shares repurchased |  | 0 | 292,449 |  |  |  |  |

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