Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018		$ (62,973)			$ (62,973)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					(2,189)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for New Accounting Standards, Net of Tax					668
Stockholders' Equity, Other		0		$ 1,077
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ 2,858		$ (24,881)		(804)	$ (13,903)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					(4,990)
Balance as of June 30, 2019	(70,820)				(70,820)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018		(60,504)			(60,504)
Balance as of June 30, 2019	(61,308)				(61,308)
Cash Flow Hedging | Foreign Exchange Contract
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018		423			423
Reclassification to the statement of income					(2,313)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					(4,186)
Balance as of June 30, 2019	(6,076)				(6,076)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018		(2,892)			(2,892)
Reclassification to the statement of income					124
Balance as of June 30, 2019	$ (3,436)				(3,436)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for New Accounting Standards, Net of Tax					$ 668
Stockholders' Equity, Other		$ 668