Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Employee and retiree benefits	$ 80,382	$ 87,400
Credit and net operating loss carryforwards	225,152	218,933
Intangible assets	12,489	13,622
Gain on foreign currency translation	0	10,885
Interest limitation	19,380	1,120
Inventory	13,308	4,428
Other, net	18,009	7,103
Gross deferred tax assets	368,720	343,491
Property, plant and equipment, net	(22,511)	(11,745)
Intangible assets	(616,333)	(73,979)
Loss on foreign currency translation	(7,717)	0
Deferred taxes on deemed repatriation	(88,759)	(1,610)
Gross deferred tax liabilities	(735,320)	(87,334)
Valuation allowance	(200,280)	(207,483)
Deferred Tax Liabilities, Net	(566,880)
Total net deferred tax (liabilities)/assets		48,674
Adjustment to foreign net operating loss carryforwards	$ 5,900	$ 58,800