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Share-Based Compensation Plans - Summary of Non-Vested Options (Detail) | 12 Months Ended
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Dec. 31, 2017 $ / 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 | 2,865,962
Number of shares, granted | shares | 776,500
Number of shares, forfeited | shares | (2,750)
Number of shares, outstanding, ending balance | shares | 2,621,731
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 | $ 17.24
Weighted-average exercise price, granted (usd per share) | $ / shares | 26.92
Weighted-average exercise price, forfeited (usd per share) | $ / shares | 17.65
Weighted-average exercise price, outstanding (usd per share), ending balance | $ / shares | $ 21.85
Vested Options |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |
Number of shares, vested | shares | (1,017,981)
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 | $ 12.77

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- 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. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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