Stock Repurchase Program - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
Jul. 31, 2010	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of stock repurchase plan	$ 10,000,000
Available cost of common stock		$ 1,400,000

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration