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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, 2015 USD ($) $ / shares shares
Compensation and Retirement Disclosure [Abstract] |
Outstanding Beginning balance, Number of Options | shares | 5,602
Granted, Number of Options | shares | 900
Exercised, Number of Options | shares | (1,548)
Expired or canceled, Number of Options | shares | (69)
Outstanding Ending balance, Number of Options | shares | 4,885
Vested and exercisable Ending balance, Number of Options | shares | 2,204
Outstanding beginning balance, Weighted Average Exercise Price Per Share | $ / shares | $ 7.06
Granted, Weighted Average Exercise Price Per Share | $ / shares | 9.25
Exercised, Weighted Average Exercise Price Per Share | $ / shares | 6.93
Expired or canceled, Weighted Average Exercise Price Per Share | $ / shares | 7.10
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares | 7.50
Vested and exercisable Ending balance, Weighted Average Exercise Price | $ / shares | $ 6.96
Weighted Average Remaining Contractual Term, Outstanding | 3 years 4 months 28 days
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2015 | 2 years 5 months 9 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $ | $ 11.5
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2015 | $ | $ 6.4

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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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