Equity-Based Compensation - Schedule of Employee Stock Performance Activity (Detail)	3 Months Ended
Mar. 31, 2019 $ / shares shares
Time-Vesting Restricted Shares/Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	901,704
Shares/Units, Granted \| shares	47,772
Shares/Units, Vested \| shares	(87,079)
Shares/Units, Forfeited \| shares	(121,518)
Shares/Units, Outstanding, Ending Balance \| shares	740,879
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Beginning Balance \| $ / shares	$ 17.34
Weighted Average Grant Date Fair Value per Shares/Units, Granted \| $ / shares	25.70
Weighted Average Grant Date Fair Value per Shares/Units, Vested \| $ / shares	17.12
Weighted Average Grant Date Fair Value per Shares/Units, Forfeited \| $ / shares	16.33
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Ending Balance \| $ / shares	$ 18.07
Bonus Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	560,710
Shares/Units, Granted \| shares	224,928
Shares/Units, Vested \| shares	(319,868)
Shares/Units, Forfeited \| shares	(246,678)
Shares/Units, Outstanding, Ending Balance \| shares	219,092
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Beginning Balance \| $ / shares	$ 15.06
Weighted Average Grant Date Fair Value per Shares/Units, Granted \| $ / shares	25.70
Weighted Average Grant Date Fair Value per Shares/Units, Vested \| $ / shares	15.06
Weighted Average Grant Date Fair Value per Shares/Units, Forfeited \| $ / shares	15.32
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Ending Balance \| $ / shares	$ 25.70
Long-Term Incentive Performance Restricted Shares/Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares/Units, Outstanding, Beginning Balance \| shares	1,155,486
Shares/Units, Granted \| shares	1,233,742
Shares/Units, Vested \| shares	(27,877)
Shares/Units, Forfeited \| shares	(285,428)
Shares/Units, Outstanding, Ending Balance \| shares	2,075,923
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Beginning Balance \| $ / shares	$ 15.82
Weighted Average Grant Date Fair Value per Shares/Units, Granted \| $ / shares	25.70
Weighted Average Grant Date Fair Value per Shares/Units, Vested \| $ / shares	15.24
Weighted Average Grant Date Fair Value per Shares/Units, Forfeited \| $ / shares	18.11
Weighted Average Grant Date Fair Value per Shares/Units, Outstanding, Ending Balance \| $ / shares	$ 21.39

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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- 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

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)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

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.

+ References

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-Publisher FASB
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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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No definition available.

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