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Share Repurchase Plan - Additional Information (Detail) - $ / shares	3 Months Ended		111 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	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
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			$ 3.37
Number of shares repurchased	0	0

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Description of share repurchase program, including accounting treatment.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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