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Stock-Based Compensation - Stock Option Activity Under Equity Incentive Plans (Detail) - Stock Options [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning balance | shares 19,413
Number of Shares, Options granted | shares 5,322
Number of Shares, Options exercised | shares (5,284)
Number of Shares, Options forfeited and canceled | shares (625)
Number of Shares, Outstanding, Ending balance | shares 18,826
Number of Shares, Exercisable | shares 10,504
Weighted-Average Exercise Price per Share, Outstanding, Beginning balance | $ / shares $ 12.01
Weighted-Average Exercise Price per Share, Options granted | $ / shares 40.56
Weighted-Average Exercise Price per Share, Options exercised | $ / shares 10.88
Weighted-Average Exercise Price per Share, Options forfeited and Canceled | $ / shares 13.69
Weighted-Average Exercise Price per Share, Outstanding, Ending balance | $ / shares 20.35
Weighted-Average Exercise Price per Share, Exercisable | $ / shares $ 11.95
Weighted-Average Remaining Contractual Life, Outstanding 5 years 1 month 24 days
Weighted-Average Remaining Contractual Life, Exercisable 3 years 6 months 25 days
Aggregate Intrinsic Value, Outstanding | $ $ 741,257
Aggregate Intrinsic Value, Exercisable | $ $ 501,818