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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic									$ 30,013	$ 66,202	$ 59,408
Foreign									57,092	61,601	45,978
Income before income tax provision (benefit)	$ 28,430	$ 41,411	$ (4,629)	$ 21,893	$ 5,269	$ 31,983	$ 41,984	$ 48,567	$ 87,105	$ 127,803	$ 105,386