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Stock-Based Compensation - Stock Options (Detail) - Stock Options
shares in Thousands
 9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares Under Option  
Outstanding at the beginning of the period (in shares) | shares 4,745
Granted (in shares) | shares 1,253
Exercised (in shares) | shares (1,110)
Cancelled (in shares) | shares (59)
Outstanding at the end of the period (in shares) | shares 4,829
Exercisable as of September 30, 2018 | shares 2,016
Weighted-Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 17.96
Granted (in dollars per share) | $ / shares 59.61
Exercised (in dollars per share) | $ / shares 6.46
Cancelled (in dollars per share) | $ / shares 44.31
Outstanding at the end of the period (in dollars per share) | $ / shares 31.09
Exercisable as of September 30, 2018 | $ / shares $ 12.36