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Employee Share Plans - Stock Award Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Compensation And Retirement Disclosure [Abstract]  
Outstanding Beginning balance, Number of Options | shares 3,622
Exercised, Number of Options | shares (1,210)
Outstanding Ending balance, Number of Options | shares 2,412
Vested and exercisable Ending balance, Number of Options | shares 1,456
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares $ 11.97
Exercised, Weighted Average Exercise Price Per Share | $ / shares 8.77
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares 13.58
Vested and exercisable Ending balance, Weighted Average Exercise Price Per Share | $ / shares $ 11.54
Weighted Average Remaining Contractual Term, Outstanding 2 years 9 months
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2019 2 years 1 month 17 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $ $ 32.3
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2019 | $ $ 22.4