Stock-based Compensation - Schedule of Non-Vested RSUs (Detail) shares in Thousands	3 Months Ended
Mar. 31, 2018 $ / shares shares
Nonvested Restricted Stock Units Activity [Line Items]
Non-vested, beginning balance \| shares	2,280
Shares, Granted \| shares	501
Shares, Vested \| shares	(39)
Shares, Forfeited \| shares	(606)
Non-vested, ending balance \| shares	2,136
Weighted average grant date fair value, Non-vested, beginning balance \| $ / shares	$ 39.16
Weighted average grant date fair value, Granted \| $ / shares	28.66
Weighted average grant date fair value, Vested \| $ / shares	38.28
Weighted average grant date fair value, Forfeited \| $ / shares	44.94
Weighted average grant date fair value, Non-vested, ending balance \| $ / shares	$ 35.07
Time-based RSUs [Member]
Nonvested Restricted Stock Units Activity [Line Items]
Non-vested, beginning balance \| shares	1,048
Shares, Granted \| shares	138
Shares, Vested \| shares	(27)
Shares, Forfeited \| shares	(44)
Non-vested, ending balance \| shares	1,115
Weighted average grant date fair value, Non-vested, beginning balance \| $ / shares	$ 35.76
Weighted average grant date fair value, Granted \| $ / shares	28.84
Weighted average grant date fair value, Vested \| $ / shares	35.75
Weighted average grant date fair value, Forfeited \| $ / shares	35.68
Weighted average grant date fair value, Non-vested, ending balance \| $ / shares	$ 34.90
Performance-based RSUs [Member]
Nonvested Restricted Stock Units Activity [Line Items]
Non-vested, beginning balance \| shares	1,209
Shares, Granted \| shares	363
Shares, Vested \| shares	(12)
Shares, Forfeited \| shares	(562)
Non-vested, ending balance \| shares	998
Weighted average grant date fair value, Non-vested, beginning balance \| $ / shares	$ 42.18
Weighted average grant date fair value, Granted \| $ / shares	28.59
Weighted average grant date fair value, Vested \| $ / shares	44.08
Weighted average grant date fair value, Forfeited \| $ / shares	45.72
Weighted average grant date fair value, Non-vested, ending balance \| $ / shares	$ 35.23
Market-based RSUs [Member]
Nonvested Restricted Stock Units Activity [Line Items]
Non-vested, beginning balance \| shares	23
Non-vested, ending balance \| shares	23
Weighted average grant date fair value, Non-vested, beginning balance \| $ / shares	$ 35.15
Weighted average grant date fair value, Non-vested, ending balance \| $ / shares	$ 35.15

Nonvested Restricted Stock Units Activity [Line Items]

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(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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