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Share-Based Compensation Plans - Summary of Stock Option Activity (Detail) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, outstanding, beginning balance | shares	3,960,040
Number of shares, granted | shares	776,500
Number of shares, exercised | shares	(2,007,762)
Number of shares, expired | shares	(7,334)
Number of shares, forfeited | shares	(2,750)
Number of shares, outstanding, ending balance | shares	2,718,694
Exercisable at December 31, 2017 | shares	96,963
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding (usd per share), beginning balance | $ / shares	$ 15.25
Weighted-average exercise price, issued (usd per share) | $ / shares	26.92
Weighted-average exercise price, exercised (usd per share) | $ / shares	11.30
Weighted-average exercise price, expired (usd per share) | $ / shares	10.91
Weighted-average exercise price, forfeited (usd per share) | $ / shares	17.65
Weighted-average exercise price, outstanding (usd per share), ending balance | $ / shares	21.52
Weighted-average exercise price, exercisable (usd per share) | $ / shares	$ 12.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term in years, outstanding (years)	7 years 6 months 14 days
Weighted-average remaining contractual term in years, exercisable (years)	4 years 22 days
Aggregate intrinsic value, exercised | $	$ 32,029
Aggregate intrinsic value, outstanding | $	12,887
Aggregate intrinsic value, exercisable | $	$ 1,317

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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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 vested portions of options outstanding and currently 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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