Shareholders' Equity - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 290,311	$ 299,627	$ 295,863
Other comprehensive income (loss)	(2,830)	(7,053)
Income taxes	791	1,203
Other expense, net	(2,806)	(259)	(2,895)
Income taxes	15,527	10,849	16,200
Ending Balance	263,477	290,311	299,627
Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other expense, net	2,727
Income taxes	(1,036)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,389)	(482)
Other comprehensive income (loss)	(726)	(3,907)
Ending Balance	(5,115)	(4,389)	(482)
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	228	100
Other comprehensive income (loss)	(360)	202
Income taxes	132	(74)
Ending Balance		228	100
Debt Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,071)
Other comprehensive income (loss)	(1,744)	(3,348)
Income taxes	659	1,277
Ending Balance	(1,465)	(2,071)
Debt Securities [Member] | Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other expense, net	2,727
Income taxes	(1,036)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,232)	(382)	3,503
Ending Balance	$ (6,580)	$ (6,232)	$ (382)