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Stockholders' Equity - Schedule of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2015 | shares 2,171
Number of Shares, Granted | shares 83
Number of Shares, Exercised | shares (294)
Number of Shares, Forfeited | shares (198)
Number of Shares, Outstanding at September 30, 2016 | shares 1,762
Number of Shares, Exercisable at September 30, 2016 | shares 1,073
Number of Shares, Vested and expected to vest at September 30, 2016 | shares 1,683
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 33.84
Weighted - Average Exercise Price Per Share, Granted | $ / shares 35.61
Weighted - Average Exercise Price Per Share, Exercised | $ / shares 32.52
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares 35.76
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 33.93
Weighted - Average Exercise Price Per Share, Exercisable at September 30, 2016 | $ / shares 33.00
Weighted - Average Exercise Price Per Share, Vested and expected to vest at September 30, 2016 | $ / shares $ 33.87
Weighted - Average Remaining Contractual Term, Outstanding at September 30, 2016 6 years 3 months 18 days
Weighted - Average Remaining Contractual Term, Exercisable at September 30, 2016 5 years 11 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at September 30, 2016 6 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding at September 30, 2016 | $ $ 8,811
Aggregate Intrinsic Value, Exercisable at September 30, 2016 | $ 6,331
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2016 | $ $ 8,514