Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Pre Tax Income [Line Items]
Pre-tax income from U.S. operations	$ 126,400	$ 112,500	$ 105,200
U.S. federal tax at statutory rate	35.00%	35.00%	35.00%
Stock compensation expense	$ 9,115	$ 7,266
Employee and non-employee awards	$ 56,900
Additional annual limitations	50% or greater change
Percentage of change in ownership	50.00%
Additional annual limitations period	3 years
Capital loss on the sale	$ 20,600
Capital loss carried back	1,200
Undistributed earnings of foreign subsidiaries	27,000
Undistributed earnings of foreign subsidiaries, deferred tax liability	3,300
Foreign Country [Member]
Schedule Of Pre Tax Income [Line Items]
Pre-tax income from foreign operations	21,500	$ 6,000	$ 2,100
US Country [Member]
Schedule Of Pre Tax Income [Line Items]
Net operating loss carryforwards	$ 6,700
Net operating loss carryforwards, expiration date	2021
State [Member]
Schedule Of Pre Tax Income [Line Items]
Net operating loss carryforwards	$ 4,400
Net operating loss carryforwards, expiration date	2017