Stockholders' Equity - Reclassifications from AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes	$ (68,649)	$ (55,224)	$ (116,196)
Other non-operating expense, net	(2,692)	(1,879)	(5,107)
Net Income (Loss)	126,628	(213,512)	(533,299)
Derivative Instruments | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	12,293	18,046
Provision for income taxes	80	(652)
Net Income (Loss)	12,373	17,394
Derivative Instruments | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales			(8,575)
Provision for income taxes			148
Net Income (Loss)			(8,427)
Employee Benefit Plans | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes	1,881	1,255	2,345
Other non-operating expense, net	(7,825)	(5,319)	(10,177)
Net Income (Loss)	(5,944)	(4,064)	(7,832)
Amortization of prior service credit (cost) | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating expense, net	1,735	1,974	2,008
Recognized actuarial loss | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating expense, net	(9,510)	(7,201)	(8,198)
Curtailment loss | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating expense, net	(50)	(92)	(739)
Settlement loss | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating expense, net	$ 0	$ 0	$ (3,248)