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Share-Based Compensation - Certain Information Related to Stock Options and Restricted Stock and PSUs (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Number of Options beginning balance	2,269
Stock Options Number of Options Granted	1,114
Stock Options Number of Options Exercised	(124)
Stock Options Number of Options Expired	(45)
Stock Options Number of Options ending balance	3,214	2,269
Stock Options Number of Options Exercisable	1,249
Stock Options Weighted Average Exercise Price per Share Outstanding beginning balance	$ 13.22
Stock Options Weighted Average Exercise Price per Share Granted	19.56
Stock Options Weighted Average Exercise Price per Share Exercised	7.29
Stock Options Weighted Average Exercise Price per Share Expired	4.70
Stock Options Weighted Average Exercise Price per Share Outstanding ending balance	15.77	$ 13.22
Stock Options Weighted Average Exercise Price per Share Exercisable	$ 11.23
Stock Options Aggregate Intrinsic Value Outstanding	$ 40,589
Stock Options Aggregate Intrinsic Value Exercisable	$ 21,438
Stock Options Weighted Average Remaining Term	5 years 18 days
Exercisable Stock Options Weighted Average Remaining Term	2 years 5 months 27 days
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares beginning balance	615
Number of Shares Vested	(615)
Number of Shares ending balance		615
Weighted Average Grant Date Fair Value per Share beginning balance	$ 26.04
Weighted Average Grant Date Fair Value per Share Granted		$ 26.04	$ 12.88
Weighted Average Grant Date Fair Value per Share Vested	$ 26.04
Weighted Average Grant Date Fair Value per Share ending balance		$ 26.04
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Granted	173
Number of Shares ending balance	173
Weighted Average Grant Date Fair Value per Share Granted	$ 23.18
Weighted Average Grant Date Fair Value per Share ending balance	$ 23.18

X

- 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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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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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.

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

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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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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