Summary of Company's Stock Option Activity and Related Information (Detail) (USD $)	6 Months Ended
Jun. 30, 2012
Options
Beginning Balance	2,475,750
Grants	304,000
Exercises	(120,000)
Cancellations	(4,750)
Ending Balance	2,655,000
Options exercisable at End of Period	1,612,875
Weighted-average exercise price
Beginning Balance	$ 12.62
Grants	$ 11.64
Exercises	$ 6.08
Cancellations	$ 15.20
Ending Balance	$ 12.80
Options exercisable at End of Period	$ 14.07
Weighted Average Remaining Contractual Term
Options outstanding, June 30, 2012	6 years 7 months 2 days
Options exercisable, June 30, 2012	5 years 4 months 10 days
Aggregate Intrinsic Value
Options outstanding, June 30, 2012	$ 7,231,883
Options exercisable, June 30, 2012	$ 5,184,715

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