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Employee Share Plans - Stock Award Activity (Detail) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares shares
Compensation And Retirement Disclosure [Abstract] |
Outstanding Beginning balance, Number of Options | shares | 4,376
Granted, Number of Options | shares | 654
Exercised, Number of Options | shares | (1,176)
Expired or canceled, Number of Options | shares | (10)
Outstanding Ending balance, Number of Options | shares | 3,844
Vested and exercisable Ending balance, Number of Options | shares | 2,004
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares | $ 8.02
Granted, Weighted Average Exercise Price Per Share | $ / shares | 15.54
Exercised, Weighted Average Exercise Price Per Share | $ / shares | 6.81
Expired or canceled, Weighted Average Exercise Price Per Share | $ / shares | 7.79
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares | 9.67
Vested and exercisable Ending balance, Weighted Average Exercise Price | $ / shares | $ 7.85
Weighted Average Remaining Contractual Term, Outstanding | 3 years 1 month 24 days
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2017 | 2 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $ | $ 22.3
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2017 | $ | $ 15.2

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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