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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, 2016 USD ($) $ / shares shares
Compensation And Retirement Disclosure [Abstract] |
Outstanding Beginning balance, Number of Options | shares | 4,885
Granted, Number of Options | shares | 654
Exercised, Number of Options | shares | (1,127)
Expired or canceled, Number of Options | shares | (36)
Outstanding Ending balance, Number of Options | shares | 4,376
Vested and exercisable Ending balance, Number of Options | shares | 2,215
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares | $ 7.50
Granted, Weighted Average Exercise Price Per Share | $ / shares | 10.35
Exercised, Weighted Average Exercise Price Per Share | $ / shares | 7.16
Expired or canceled, Weighted Average Exercise Price Per Share | $ / shares | 7.56
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares | 8.02
Vested and exercisable Ending balance, Weighted Average Exercise Price | $ / shares | $ 7.08
Weighted Average Remaining Contractual Term, Outstanding | 3 years 2 months 1 day
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2015 | 2 years 3 months
Aggregate Intrinsic Value, Outstanding Ending Balance | $ | $ 24.9
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2015 | $ | $ 14.7

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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=6415400&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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