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Employee Share Plans - Stock Award Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
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