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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, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning balance | shares 18,782
Number of Shares, Options granted | shares 3,368
Number of Shares, Options exercised | shares (2,337)
Number of Shares, Options forfeited and canceled | shares (400)
Number of Shares, Outstanding, Ending balance | shares 19,413
Number of Shares, Vested and Expected to Vest | shares 18,970
Number of Shares, Exercisable | shares 12,783
Weighted-Average Exercise Price per Share, Outstanding, Beginning balance | $ / shares $ 11.22
Weighted-Average Exercise Price per Share, Options granted | $ / shares 13.92
Weighted-Average Exercise Price per Share, Options exercised | $ / shares 8.03
Weighted-Average Exercise Price per Share, Options forfeited and Canceled | $ / shares 13.97
Weighted-Average Exercise Price per Share, Outstanding, Ending balance | $ / shares 12.01
Weighted-Average Exercise Price per Share, Vested and expected to vest | $ / shares 11.97
Weighted-Average Exercise Price per Share, Exercisable | $ / shares $ 10.94
Weighted-Average Remaining Contractual Life, Outstanding 4 years 7 months 10 days
Weighted-Average Remaining Contractual Life, Vested and expected to Vest 4 years 6 months 18 days
Weighted-Average Remaining Contractual Life, Exercisable 3 years 5 months 27 days
Aggregate Intrinsic Value, Outstanding | $ $ 26,513
Aggregate Intrinsic Value, Vested and expected to Vest | $ 26,485
Aggregate Intrinsic Value, Exercisable | $ $ 25,684