Stock-based Compensation - Schedule of Non-Vested RSUs (Detail)	6 Months Ended
Jun. 30, 2018 $ / shares shares
Shares
Beginning balance (in shares) \| shares	2,280,000
Granted (in shares) \| shares	969,000
Vested (in shares) \| shares	(126,000)
Forfeited (in shares) \| shares	(646,000)
Ending balance (in shares) \| shares	2,477,000
Weighted average grant date fair value
Beginning balance (in USD per share) \| $ / shares	$ 39.16
Granted (in USD per share) \| $ / shares	28.14
Vested (in USD per share) \| $ / shares	34.42
Forfeited (in USD per share) \| $ / shares	44.34
Ending balance (in USD per share) \| $ / shares	$ 33.73
Time-based
Shares
Beginning balance (in shares) \| shares	1,048,000
Granted (in shares) \| shares	491,000
Vested (in shares) \| shares	(106,000)
Forfeited (in shares) \| shares	(67,000)
Ending balance (in shares) \| shares	1,366,000
Weighted average grant date fair value
Beginning balance (in USD per share) \| $ / shares	$ 35.76
Granted (in USD per share) \| $ / shares	28.03
Vested (in USD per share) \| $ / shares	32.44
Forfeited (in USD per share) \| $ / shares	35.67
Ending balance (in USD per share) \| $ / shares	$ 33.24
Performance-based
Shares
Beginning balance (in shares) \| shares	1,209,000
Granted (in shares) \| shares	478,000
Vested (in shares) \| shares	(20,000)
Forfeited (in shares) \| shares	(579,000)
Ending balance (in shares) \| shares	1,088,000
Weighted average grant date fair value
Beginning balance (in USD per share) \| $ / shares	$ 42.18
Granted (in USD per share) \| $ / shares	28.26
Vested (in USD per share) \| $ / shares	44.83
Forfeited (in USD per share) \| $ / shares	45.35
Ending balance (in USD per share) \| $ / shares	$ 34.32
Market-based
Shares
Beginning balance (in shares) \| shares	23,000
Granted (in shares) \| shares	0
Vested (in shares) \| shares	0
Forfeited (in shares) \| shares	0
Ending balance (in shares) \| shares	23,000
Weighted average grant date fair value
Beginning balance (in USD per share) \| $ / shares	$ 35.15
Granted (in USD per share) \| $ / shares	0.00
Vested (in USD per share) \| $ / shares	0.00
Forfeited (in USD per share) \| $ / shares	0.00
Ending balance (in USD per share) \| $ / shares	$ 35.15

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

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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).

+ References

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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

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-Paragraph 2
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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-Publisher FASB
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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
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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.

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