Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		3 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2019 USD ($) plan shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Stock split ratio (in shares)		2
Adjustments to Equity, Reclassification of Taxes, Effects of New Accounting Standards Update, Retained Earnings					$ (22,085)
Number of stock-based compensation plans | plan			1
Retained Earnings (Accumulated Deficit)			$ 2,141,302	$ 1,997,785
Cost of Goods Sold	[1]		3,776,183	3,759,112	3,455,306
Selling, general and administrative expenses (a)	[1]		315,703	308,376	305,173
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	[1]		(17,796)	(36,966)	$ (33,441)
Operating Lease, Liability			$ 195,200
Building
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life (in years)			35 years
Machinery and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life (in years)			3 years
Machinery and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life (in years)			20 years
Customer Relationships [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life			20 years
Other Intangible Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Restricted stock units
Summary Of Significant Accounting Policies [Line Items]
Number of common shares issuable per restricted stock unit (in shares) | shares			1
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained Earnings (Accumulated Deficit)							$ 9,100
Accounting Standards Update 2017-07 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cost of Goods Sold				26,600
Selling, general and administrative expenses (a)				6,800
Pension and Other Postretirement Benefits Cost (Reversal of Cost)				$ (33,400)
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Retained Earnings (Accumulated Deficit)						$ (600)
Assets, Noncurrent						160,800
Operating Lease, Liability						$ 161,400

[1] Cost of goods sold, selling, general and administrative expenses and other pension and postretirement income include the impact of the Accounting Standards Update issued by the Financial Accounting Standards Board which amended the presentation of net periodic pension and postretirement benefit costs to report certain components, including interest cost, expected return on the plan assets, amortization of prior service cost or credits and actuarial gains and losses, separately. For 2017 these items have been reclassified from cost of goods sold and selling, general and administrative expenses to other pension and postretirement income.