Components of Income before Income Tax Expense from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic (U.S.)	$ 44,110	$ 23,122	$ 19,614
Foreign (Non-U.S.)	285,535	278,632	229,976
Income before income tax expense	$ 329,645	$ 301,754	$ 249,590