Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
(Losses) gains on derivatives qualifying as hedges, net of tax		$ (4,955)	$ 1,890
Prior service cost	[1]	3,543	3,512
Actuarial losses	[1]	(10,206)	(12,982)
(Losses) gains on pension and postretirement liability adjustments		(5,333)	(7,323)
Cost of goods sold [Member] | Foreign currency contracts [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
(Losses) gains on derivatives qualifying as hedges		(5,169)	2,568
Interest expense | Interest rate swaps
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
(Losses) gains on derivatives qualifying as hedges		(432)	(357)
Provision for income taxes [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Provision for income taxes for (Losses) gains on derivatives qualifying as hedges		646	(321)
Provision for income taxes for gains (Losses) on pension and postretirement liability adjustments		$ 1,330	$ 2,147

[1] of our 2017 Form 10-K for additional information regarding net periodic benefit cost.