Stockholders' Equity - Classification and Amount of Reclassifications from Accumulated Other Comprehensive Income to Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes									$ (55,224)	$ (116,196)	$ (553,334)
Other non-operating expense, net									(2,650)	(7,331)	(68,110)
(Loss) income before income taxes	$ 9,182	$ 101,955	$ (95,824)	$ (173,601)	$ 54,274	$ 72,592	$ (230,064)	$ (313,905)	(158,288)	(417,103)	(501,245)
Net Loss	$ 175	$ 70,596	$ (107,987)	$ (176,296)	$ 9,639	$ 6,278	$ (237,963)	$ (311,253)	(213,512)	(533,299)	(1,054,579)
Derivative Instruments | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales									18,046
Provision for income taxes									(652)
Net Loss									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)	(16,717)
Provision for income taxes										148	(93)
Net Loss										(8,427)	(16,810)
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									1,255	2,345	1,964
(Loss) income before income taxes									(5,319)	(10,177)	(8,643)
Net Loss									(4,064)	(7,832)	(6,679)
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									1,974	2,008	(29)
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									(7,201)	(8,198)	(8,511)
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									(92)	(739)	(103)
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	(3,248)	0
Currency Translation Adjustments | Reclassification Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes									0	0	0
Other non-operating expense, net									0	0	(58,973)
Net Loss									$ 0	$ 0	$ (58,973)