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Share Repurchases - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
	May 31, 2012	Apr. 30, 2011	Dec. 31, 2013
Equity [Abstract]
Authorized a share repurchase under a stock repurchase plan	$ 25,000,000	$ 50,000,000	$ 25,000,000
Share repurchase program period	2 years

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- Details

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

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No definition available.

+ Details

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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