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Share Repurchase Plan - Additional Information (Detail) (USD $)
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3 Months Ended | 3 Months Ended | ||||||
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Feb. 28, 2014
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Nov. 30, 2013
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Jun. 06, 2012
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Dec. 31, 2011
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Feb. 28, 2014
Common Stock [Member]
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Feb. 28, 2013
Common Stock [Member]
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Feb. 28, 2014
Saneron [Member]
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Nov. 30, 2013
Saneron [Member]
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| Schedule of Share Repurchase Plan [Line Items] | ||||||||
| Number of shares authorized to repurchase | (3,000,000) | (1,000,000) | ||||||
| Number of shares repurchased | 1,344,566 | 217,751 | 107,128 | |||||
| Average price per share (repurchased) | $ 2.15 | $ 2.08 | $ 2.31 | |||||
| Treasury stock, shares | 1,494,666 | 1,276,915 | 150,100 | 150,100 | ||||
| Shares repurchase plan | Open market purchases, Privately negotiated block trades, Unsolicited negotiated transactions, and/or trading plan in accordance with Rule 10b5-1 of the Securities and Exchange Commission | |||||||
| Common stock additional share repurchased | 280,518 | |||||||
| Average price per share additional repurchased | $ 2.24 | |||||||