Components of Income Before Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Domestic									$ 59,408	$ 60,315	$ 32,498
Foreign									45,978	41,096	(687)
Income before income tax provision	$ 17,926	$ 16,486	$ 35,631	$ 35,343	$ 10,623	$ 34,851	$ 27,472	$ 28,465	$ 105,386	$ 101,411	$ 31,811