Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	$ (4,576)	$ 14,369	$ (26,397)	$ 52,303
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	(2,300)		(4,400)
Benefit for Income Taxes	600		1,100
Amortization of net actuarial (losses), before tax	(1,700)		(5,000)
Amortization of net prior service (cost) credit, before tax	(600)		600
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	(7,500)		(36,900)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Related to Net Investment Hedges, before Reclassification and Tax	2,400		12,000
Foreign currency translation, tax (provision) related to net investment hedges	(600)		(2,800)
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	$ 1,100		$ 1,300