Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Customer	Dec. 31, 2011 Customer	Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]
Recorded remeasurement losses for foreign currency exchange rate	$ 700,000	$ 700,000	$ 1,000,000
Cash and cash equivalents maximum maturity	3 months	3 months	3 months
Max percentage of receivable from customer		10.00%
Number of customers accounted for greater than ten percent of accounts receivable balance	0	0
Revenue recognition period, associated with service and maintenance agreement	1 year
Percentage of revenue recognized upon completion contract method	100.00%
Depreciation and amortization expense	15,200,000	13,900,000	10,000,000
Advertising expense	500,000	800,000	400,000
Stock-based compensation	18,926,000	20,913,000	15,539,000
Forward exchange contracts maturity term description	The Company's forward exchange contracts generally have maturities of between one and three months
Tax benefit realized upon settlement	50.00%
Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	5 years
Machinery and equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	4 years
Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment leasehold improvements useful lives	Shorter of remaining lease term or remaining useful life of ten years
ILS [Member]
Summary Of Significant Accounting Policies [Line Items]
Forward exchange contract to buy	3,200,000
Forward exchange contracts to sell		4,300,000
Euros [Member]
Summary Of Significant Accounting Policies [Line Items]
Forward exchange contracts to sell	5,600,000	6,900,000
Pounds [Member]
Summary Of Significant Accounting Policies [Line Items]
Forward exchange contracts to sell	2,200,000	5,700,000
Yen [Member]
Summary Of Significant Accounting Policies [Line Items]
Forward exchange contracts to sell	3,300,000
Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Software Development [Member]
Summary Of Significant Accounting Policies [Line Items]
Internal use software development cost capitalized	$ 800,000	$ 1,100,000	$ 1,000,000
Comcast [Member]
Summary Of Significant Accounting Policies [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	12.00%	11.00%	17.00%