Income Taxes - Components of Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
United States											$ 134,740	$ 52,563	$ 47,963
Foreign											50,841	60,810	50,806
Income before income taxes	$ 109,862	$ (16,252)	$ (34,143)		$ 126,114		$ 62,623	$ 18,566	$ 32,876	$ (692)	$ 185,581	$ 113,373	$ 98,769

[1] As previously discussed in Note 1, Nature of Business and Summary of Significant Accounting Policies, the Company adopted ASU 2016-09 during the year ended December 31, 2016. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the adoption to the Company's previously reported quarterly results for the quarters ended March 31 and June 30, 2016 are reflected in the table above.