Equity-Based Compensation - Schedule of Employee Stock Performance Activity (Detail)	12 Months Ended
Dec. 31, 2017 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding, Ending Balance	4,240,991
Time-Vesting Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding, Beginning Balance	1,323,025
Shares, Granted	1,290,057
Shares, Vested	(449,904)
Shares, Forfeited	(310,666)
Shares, Outstanding, Ending Balance	1,852,512
Weighted Average Grant Date Fair Value per Share, Outstanding, Beginning Balance \| $ / shares	$ 17.47
Weighted Average Grant Date Fair Value per Share, Granted \| $ / shares	16.91
Weighted Average Grant Date Fair Value per Share, Vested \| $ / shares	17.18
Weighted Average Grant Date Fair Value per Share, Forfeited \| $ / shares	17.80
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending Balance \| $ / shares	$ 17.09
Bonus Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding, Beginning Balance	451,289
Shares, Granted	923,678
Shares, Forfeited	(569,722)
Shares, Outstanding, Ending Balance	805,245
Weighted Average Grant Date Fair Value per Share, Outstanding, Beginning Balance \| $ / shares	$ 17.88
Weighted Average Grant Date Fair Value per Share, Granted \| $ / shares	18.10
Weighted Average Grant Date Fair Value per Share, Forfeited \| $ / shares	17.95
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending Balance \| $ / shares	$ 18.09
Long-Term Incentive Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding, Beginning Balance	212,369
Shares, Granted	791,108
Shares, Forfeited	(138,905)
Shares, Outstanding, Ending Balance	864,572
Weighted Average Grant Date Fair Value per Share, Outstanding, Beginning Balance \| $ / shares	$ 18.43
Weighted Average Grant Date Fair Value per Share, Granted \| $ / shares	18.57
Weighted Average Grant Date Fair Value per Share, Forfeited \| $ / shares	18.75
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending Balance \| $ / shares	$ 18.50
2.75x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding, Beginning Balance	1,310,726
Shares, Vested	(455,148)
Shares, Forfeited	(238,785)
Shares, Outstanding, Ending Balance	616,793
Weighted Average Grant Date Fair Value per Share, Outstanding, Beginning Balance \| $ / shares	$ 8.19
Weighted Average Grant Date Fair Value per Share, Vested \| $ / shares	13.24
Weighted Average Grant Date Fair Value per Share, Forfeited \| $ / shares	13.11
Weighted Average Grant Date Fair Value per Share, Outstanding, Ending Balance \| $ / 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://www.xbrl.org/2003/role/presentationRef
-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=96867065&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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

No definition available.

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