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Share-Based Compensation - Schedule of Performance Stock Units Activity (Detail) - Performance Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares) | shares	252
Awards granted (in shares) | shares	91
Awards released (in shares) | shares	(29)
Awards forfeited (in shares) | shares	(39)
Unvested share awards outstanding, end of period (in shares) | shares	275
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) | $ / shares	$ 25.71
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	36.34
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	29.11
Awards forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	29.11
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) | $ / shares	$ 28.40
Unvested share awards outstanding, Intrinsic Value | $	$ 18,348

X

- Definition

The number of equity-based payment instruments, excluding stock options, that released during the reporting period.

+ References

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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 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

The intrinsic value of equity-based payment equity instruments, excluding stock options, as calculated by applying the disclosed pricing methodology.

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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://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.

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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

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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).

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X

- 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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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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