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Stock Purchase - Additional Information (Detail) (USD $)	Feb. 28, 2013	Dec. 31, 2008
Stock Repurchase Program [Line Items]
Shares authorized to purchase		750,000
Cumulative number of shares repurchased	74,684
Cost of repurchased shares, including commissions	$ 923,000

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Stock repurchase program number of shares repurchased

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Stock repurchase program total cost of repurchased shares

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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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