Equity-Based Compensation - Schedule of Employee Stock Performance Activity (Detail)	6 Months Ended
Jun. 30, 2018 $ / shares shares
Time-Vesting Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	1,852,512
Shares/Units, Granted \| shares	345,310
Shares/Units, Vested \| shares	(416,121)
Shares/Units, Forfeited \| shares	(538,345)
Shares/Units, Outstanding, Ending Balance \| shares	1,243,356
Weighted Average Grant Date Fair Value per Award, Outstanding, Beginning Balance \| $ / shares	$ 17.09
Weighted Average Grant Date Fair Value per Award, Granted \| $ / shares	17.35
Weighted Average Grant Date Fair Value per Award, Vested \| $ / shares	18.00
Weighted Average Grant Date Fair Value per Award, Forfeited \| $ / shares	17.79
Weighted Average Grant Date Fair Value per Award, Outstanding, Ending Balance \| $ / shares	$ 16.56
Bonus Performance Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	805,245
Shares/Units, Granted \| shares	707,981
Shares/Units, Vested \| shares	(69,221)
Shares/Units, Forfeited \| shares	(798,368)
Shares/Units, Outstanding, Ending Balance \| shares	645,637
Weighted Average Grant Date Fair Value per Award, Outstanding, Beginning Balance \| $ / shares	$ 18.09
Weighted Average Grant Date Fair Value per Award, Granted \| $ / shares	14.66
Weighted Average Grant Date Fair Value per Award, Vested \| $ / shares	18.07
Weighted Average Grant Date Fair Value per Award, Forfeited \| $ / shares	17.82
Weighted Average Grant Date Fair Value per Award, Outstanding, Ending Balance \| $ / shares	$ 14.66
Long-Term Incentive Performance Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	864,572
Shares/Units, Granted \| shares	1,171,733
Shares/Units, Vested \| shares	(9,010)
Shares/Units, Forfeited \| shares	(718,464)
Shares/Units, Outstanding, Ending Balance \| shares	1,308,831
Weighted Average Grant Date Fair Value per Award, Outstanding, Beginning Balance \| $ / shares	$ 18.50
Weighted Average Grant Date Fair Value per Award, Granted \| $ / shares	15.04
Weighted Average Grant Date Fair Value per Award, Vested \| $ / shares	18.79
Weighted Average Grant Date Fair Value per Award, Forfeited \| $ / shares	17.81
Weighted Average Grant Date Fair Value per Award, Outstanding, Ending Balance \| $ / shares	$ 15.78
2.75x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	616,793
Shares/Units, Forfeited \| shares	(616,793)
Weighted Average Grant Date Fair Value per Award, Outstanding, Beginning Balance \| $ / shares	$ 3.56
Weighted Average Grant Date Fair Value per Award, Forfeited \| $ / shares	$ 3.56

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=109197908&loc=d3e5070-113901

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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.

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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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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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-Publisher FASB
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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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