Income Taxes - Summary of Components of Income Before Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic									$ 96,543	$ 30,013	$ 66,202
Foreign									111,249	57,092	61,601
Income before income tax provision	$ 31,558	$ 64,297	$ 57,722	$ 54,215	$ 28,430	$ 41,411	$ (4,629)	$ 21,893	$ 207,792	$ 87,105	$ 127,803