Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Contingencies And Commitments [Line Items]
Operating leases, rent expense	$ 7,500,000	$ 7,500,000	$ 7,300,000
Future lease payments	900,000
Maximum amount of potential future payments under the company's financial guarantees	200,000
Non-cancelable purchase commitments	27,600,000
Israel [Member]
Contingencies And Commitments [Line Items]
Guarantees which major related to rent	500,000
Royalty expenses	3,000,000	2,400,000	3,300,000
Indemnification [Member]
Contingencies And Commitments [Line Items]
Accrual for indemnification provisions	$ 0