Incentive Stock Rights - Additional Information (Detail) (Incentive Stock Rights, USD $)	1 Months Ended
	Jun. 30, 2010	Jun. 24, 2010
Incentive Stock Rights
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Dividend distribution of rights declared for each outstanding share of common stock		1
Record date for distribution of rights	Jul. 06, 2010
Number of series B junior participating shares that can be purchased for each right that may be exercised		0.0001
Right issuable with each new share of common stock		1
Incentive Stock purchase price		$ 50
Description of the stock purchase rights plan	As long as the Rights are attached to our common stock, we will issue one Right with each new share of common stock so that all such shares will have attached Rights. Under certain conditions, each Right may be exercised to purchase 1/10,000 of a share of Series B Junior Participating Incentive Stock (Incentive Stock) at a purchase price of fifty dollars, subject to adjustment. The Rights are not presently exercisable and will only become exercisable if a person or group acquires or commences a tender offer to acquire 15% or more of our common stock. If a person or group acquires 15% or more of the common stock, each Right will be adjusted to entitle its holder to receive, upon exercise, common stock (or, in certain circumstances, other assets of ours) having a value equal to two times the exercise price of the Right or each Right will be adjusted to entitle its holder to receive, upon exercise, common stock of the acquiring company having a value equal to two times the exercise price of the Right, depending on the circumstances. The Rights expire on December 31, 2011 and may be redeemed by us for $0.001 per Right.
Date on which rights expire	2011-12-31
Rights redemption price		$ 0.001