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Share-Based Compensation Plans - Summary of Non-Vested Options (Detail)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Non-Vested Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, outstanding, beginning balance | shares	2,621,731
Number of shares, granted | shares	10,000
Number of shares, forfeited | shares	(10,250)
Number of shares, outstanding, ending balance | shares	1,671,223
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average exercise price, outstanding (usd per share), beginning balance | $ / shares	$ 21.85
Weighted-average exercise price, granted (usd per share) | $ / shares	29.48
Weighted-average exercise price, forfeited (usd per share) | $ / shares	21.96
Weighted-average exercise price, outstanding (usd per share), ending balance | $ / shares	$ 25.10
Vested Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, vested | shares	(950,258)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average exercise price, vested (usd per share) | $ / shares	$ 16.22

X

- Definition

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

+ References

No definition available.

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- Definition

Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested, Weighted Average Exercise Price

+ References

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- Definition

Weighted average price of options that were either forfeited or expired.

+ 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)-(4)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

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- Definition

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

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- Definition

Number of non-vested options outstanding.

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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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- Definition

Number of non-vested options forfeited.

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Number of options vested.

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