Stock and Incentive Programs for Employees and Directors - Schedule of Nonvested Performance Share Units Activity (Detail) shares in Thousands	12 Months Ended
Dec. 31, 2020 $ / shares shares
Performance share units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested at beginning of period, Shares \| shares	1,546
Granted, Shares \| shares	815
Vested, Shares \| shares	(144)
Forfeited, Shares \| shares	(141)
Nonvested at end of period, Shares \| shares	2,076
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value \| $ / shares	$ 7.21
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	1.61
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	16.30
Forfeited, Weighted-Average Grant Date Fair Value \| $ / shares	13.64
Nonvested at end of period, Weighted-Average Grant Date Fair Value \| $ / shares	$ 3.94
Phantom Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested at beginning of period, Shares \| shares	2,313
Granted, Shares \| shares	3,440
Vested, Shares \| shares	(665)
Forfeited, Shares \| shares	(485)
Nonvested at end of period, Shares \| shares	4,603
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value \| $ / shares	$ 5.87
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	2.36
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	5.77
Forfeited, Weighted-Average Grant Date Fair Value \| $ / shares	3.96
Nonvested at end of period, Weighted-Average Grant Date Fair Value \| $ / shares	$ 3.25

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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