Summary of Company's Stock Option Activity and Related Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2012
Options
Beginning Balance	2,475,750
Grants	304,000
Exercises	(159,823)
Cancellations	(20,250)
Ending Balance	2,599,677
Options exercisable at End of Period	1,586,802
Weighted-average exercise price
Beginning Balance	$ 12.62
Grants	$ 11.64
Exercises	$ 5.61
Cancellations	$ 13.05
Ending Balance	$ 12.93
Options exercisable at End of Period	$ 14.38
Weighted Average Remaining Contractual Term
Options outstanding, September 30, 2012	6 years 3 months 26 days
Options exercisable, September 30, 2012	5 years 26 days
Aggregate Intrinsic Value
Options outstanding, September 30, 2012	$ 6,087,520
Options exercisable, September 30, 2012	$ 4,467,268

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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