Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During the Period Related to Translation of Foreign Subsidiaries Utlizing a Functional Currency Other Than the US Dollar	$ (35,621)	$ 30,477	$ (21,821)	$ 37,934
Unrecognized Net Defined Benefit Plan Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Loss) Reclassification Adjustment from AOCI, Pension and other Postretirement Benefit Plans, before tax	(1,000)		(2,100)
Benefit for Income Taxes	300		500
Amortization of net actuarial (losses), before tax	(1,600)		(3,300)
Amortization of net prior service credit, before tax	600		1,200
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During the Period Related to Translation of Foreign Subsidiaries Utlizing a Functional Currency Other Than the US Dollar	(49,900)		(29,400)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Related to Net Investment Hedges, before Reclassification and Tax	19,200		9,600
Foreign currency translation, tax (provision) related to net investment hedges	(4,500)		(2,300)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period Related to Intra-Entity Transactions of a Long-Term Investment Nature, Net of Tax	$ (400)		$ 200