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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, 2018 USD ($) $ / shares shares
Compensation And Retirement Disclosure [Abstract] |
Outstanding Beginning balance, Number of Options | 3,844
Granted, Number of Options | 642
Exercised, Number of Options | (864)
Expired or canceled, Number of Options | 0
Outstanding Ending balance, Number of Options | 3,622
Vested and exercisable Ending balance, Number of Options | 2,011
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares | $ 9.67
Granted, Weighted Average Exercise Price Per Share | $ / shares | 19.45
Exercised, Weighted Average Exercise Price Per Share | $ / shares | 7.29
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares | 11.97
Vested and exercisable Ending balance, Weighted Average Exercise Price Per Share | $ / shares | $ 9.21
Weighted Average Remaining Contractual Term, Outstanding | 3 years 25 days
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2018 | 2 years 18 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $ | $ 28.0
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2018 | $ | $ 21.1

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