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Stockholders' Equity - Schedule of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2016 | shares 1,540
Number of Shares, Exercised | shares (127)
Number of Shares, Forfeited | shares (33)
Number of Shares, Outstanding at June 30, 2017 | shares 1,380
Number of Shares, Exercisable at June 30, 2017 | shares 859
Number of Shares, Vested and expected to vest at June 30, 2017 | shares 1,380
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 34.35
Weighted - Average Exercise Price Per Share, Exercised | $ / shares 31.70
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares 34.32
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 34.60
Weighted - Average Exercise Price Per Share, Exercisable at June 30, 2017 | $ / shares 34.03
Weighted - Average Exercise Price Per Share, Vested and expected to vest at June 30, 2017 | $ / shares $ 34.60
Weighted - Average Remaining Contractual Term, Outstanding at June 30, 2017 6 years 18 days
Weighted - Average Remaining Contractual Term, Exercisable at June 30, 2017 5 years
Weighted - Average Remaining Contractual Term, Vested and expected to vest at June 30, 2017 6 years 18 days
Aggregate Intrinsic Value, Outstanding at June 30, 2017 | $ $ 6,321
Aggregate Intrinsic Value, Exercisable at June 30, 2017 | $ 4,403
Aggregate Intrinsic Value, Vested and expected to vest at June 30, 2017 | $ $ 6,321