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Stockholders' Equity - Schedule of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 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 (496)
Number of Shares, Forfeited | shares (218)
Number of Shares, Outstanding at December 31, 2016 | shares 1,540
Number of Shares, Exercisable at December 31, 2016 | shares 883
Number of Shares, Vested and expected to vest at December 31, 2016 | shares 1,474
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 31.73
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares 35.68
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 34.35
Weighted - Average Exercise Price Per Share, Exercisable at December 31, 2016 | $ / shares 33.53
Weighted - Average Exercise Price Per Share, Vested and expected to vest at December 31, 2016 | $ / shares $ 34.32
Weighted - Average Remaining Contractual Term, Outstanding at December 31, 2016 6 years 5 months 9 days
Weighted - Average Remaining Contractual Term, Exercisable at December 31, 2016 5 years 2 months 19 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at December 31, 2016 6 years 4 months 10 days
Aggregate Intrinsic Value, Outstanding at December 31, 2016 | $ $ 13,235
Aggregate Intrinsic Value, Exercisable at December 31, 2016 | $ 8,315
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2016 | $ $ 12,727