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Stock Option Transactions (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of Shares  
Options Outstanding, Beginning Balance | shares 12,743,877
Granted | shares 7,867,683
Exercised | shares (1,442,411)
Cancelled/forfeited | shares (1,225,713)
Options Outstanding, Ending Balance | shares 17,943,436
Vested and expected to vest | shares 17,943,436
Exercisable | shares 6,464,292
Weighted Average Exercise Prices  
Weighted Average Exercise Prices, Beginning Balance | $ / shares $ 26.41
Weighted Average Exercise Prices, granted | $ / shares 34.73
Weighted Average Exercise Prices, exercised | $ / shares 18.49
Weighted Average Exercise Prices, Cancelled/forfeited | $ / shares 30.48
Weighted Average Exercise Prices, Ending Balance | $ / shares 30.42
Weighted Average Exercise Prices, Vested and expected to vest | $ / shares 30.42
Weighted Average Exercise Prices, Exercisable | $ / shares $ 26.07
Weighted average remaining contractual term, Outstanding 8 years 1 month 7 days
Weighted average remaining contractual term, Vested and expected to vest 8 years 1 month 7 days
Weighted average remaining contractual term, Exercisable 6 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding | $ $ 55,794
Aggregate Intrinsic Value, Vested and expected to vest | $ 55,794
Aggregate Intrinsic Value, Exercisable | $ $ 41,449