Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 17,066	$ 9,773	$ 24,388	$ 5,135
Effective tax rate (as a percent)	44.00%	45.00%	45.00%	42.00%
Increase (Decrease) in deferred tax assets associated with changes in unrealized gain (loss) on marketable securities			77
Increase (Decrease) in deferred tax assets associated with changes in foreign currency translation adjustment gain (loss)			1,152
Unrecognized tax benefits	526		526
Unrecognized tax benefits that would affect the effective tax rate	474		474
Unrecognized tax benefits interest and penalties	17		115
Unrecognized tax benefits accrued interest and penalties	132		132
Pan [Member]
Income Taxes [Line Items]
Deferred tax assets	$ 1,360		$ 1,360
Deferred tax assets, valuation allowance (as a percent)	100.00%		100.00%