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Stock Option and Inducement Grant Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Time-based stock options  
Number of Options  
Outstanding, December 31, 2016 | shares 9,913
Granted | shares 1,664
Exercised | shares (1,796)
Cancelled | shares (680)
Outstanding, December 31, 2017 | shares 9,101
Exercisable at December 31, 2017 | shares 5,294
Vested or expected to vest at December 31, 2017 | shares 8,670
Weighted-average Exercise Price  
Outstanding, December 31, 2016 | $ / shares $ 56.05
Granted | $ / shares 75.66
Exercised | $ / shares 42.81
Cancelled | $ / shares 83.70
Outstanding, December 31, 2017 | $ / shares 60.18
Exercisable at December 31, 2017 | $ / shares 51.54
Vested or expected to vest at December 31, 2017 | $ / shares $ 59.64
Weighted-average Remaining Contractual Term (in years)  
Outstanding, December 31, 2017 6 years 11 months 1 day
Exercisable at December 31, 2017 5 years 7 months 2 days
Vested or expected to vest at December 31, 2017 6 years 9 months 25 days
Aggregate Intrinsic Value  
Outstanding, December 31, 2017 | $ $ 609,620
Exercisable at December 31, 2017 | $ 400,390
Vested or expected to vest at December 31, 2017 | $ $ 587,480
Performance-based stock options  
Number of Options  
Outstanding, December 31, 2016 | shares 2,357
Granted | shares 25
Exercised | shares (54)
Cancelled | shares (190)
Outstanding, December 31, 2017 | shares 2,138
Exercisable at December 31, 2017 | shares 813
Weighted-average Exercise Price  
Outstanding, December 31, 2016 | $ / shares $ 69.61
Granted | $ / shares 52.61
Exercised | $ / shares 80.46
Cancelled | $ / shares 69.59
Outstanding, December 31, 2017 | $ / shares 69.14
Exercisable at December 31, 2017 | $ / shares $ 73.66
Weighted-average Remaining Contractual Term (in years)  
Outstanding, December 31, 2017 7 years 9 months 14 days
Exercisable at December 31, 2017 7 years 2 months 23 days
Aggregate Intrinsic Value  
Outstanding, December 31, 2017 | $ $ 123,795
Exercisable at December 31, 2017 | $ $ 43,416