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