Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018	$ (62,973)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,166)
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	(3,662)	$ 10,978
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4,903)
Balance as of March 31, 2019	(69,710)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018	(60,504)
Balance as of March 31, 2019	(64,166)
Cash Flow Hedging | Foreign Exchange Contract
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2018	423
Reclassification to the statement of income	(1,228)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,241)
Balance as of March 31, 2019	(2,046)
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)
Reclassification to the statement of income	62
Balance as of March 31, 2019	(3,498)
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