Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 1,899,000	$ 3,977,000	$ (18,540,000)	$ 2,813,000
Unrecognized tax benefits	5,100,000		5,100,000		4,800,000
Unrecognized tax benefits that affect effective tax rate	3,500,000		3,500,000		3,600,000
Possible decrease in unrecognized tax benefits due to lapse in foreign statute of limitation, lower bound	2,300,000		2,300,000
Possible decrease in unrecognized tax benefits due to lapse in foreign statute of limitation, upper bound	2,400,000		2,400,000
Interest and penalties accrued related to unrecognized tax benefits	$ 500,000		$ 500,000		$ 500,000