Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Acquisition Related Assets And Foreign Net Operating Loss Carryforwards [Member]	Dec. 31, 2012 Lapse In Statute Of Limitations [Member]	Dec. 31, 2012 Internal Revenue Service (IRS)	Dec. 31, 2012 Internal Revenue Service (IRS) Research	Dec. 31, 2012 State and Local Jurisdiction	Dec. 31, 2012 State and Local Jurisdiction Research	Dec. 31, 2012 Foreign Country	Dec. 31, 2012 Foreign Country Costa Rica	Dec. 31, 2011 Foreign Country Costa Rica	Dec. 31, 2010 Foreign Country Costa Rica	Jun. 30, 2009 Foreign Country Costa Rica	Dec. 31, 2012 Stock Options
Income Taxes [Line Items]
U.S Federal statutory income tax rate	35.00%	35.00%	35.00%
Undistributed earnings of foreign subsidiaries	$ 109,200,000
Tax incentives, period															12 years
Tax incentives, corporate income tax rate that would apply absent the incentives												30.00%
Tax incentives, reduction in income taxes												21,800,000	15,400,000	12,700,000
Tax benefit of tax holiday on net income per share (diluted) (usd per share)												$ 0.26	$ 0.19	$ 0.16
Deferred tax assets, valuation allowance	27,056,000	20,224,000
Change in valuation allowance	6,800,000				8,500,000	1,700,000
Net operating loss carryforwards							78,700,000		62,100,000		1,700,000					61,000,000
Research credit carryforward								5,000,000		3,400,000
Increase in unrecognized tax benefits	5,200,000
Unrecognized tax benefits	$ 20,639,000	$ 15,472,000	$ 10,961,000	$ 5,929,000