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Stockholders' Equity - Schedule of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 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 30
Number of Shares, Exercised | shares (19)
Number of Shares, Forfeited | shares (109)
Number of Shares, Outstanding at March 31, 2016 | shares 2,073
Number of Shares, Exercisable at March 31, 2016 | shares 1,110
Number of Shares, Vested and expected to vest at March 31, 2016 | shares 1,968
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 33.84
Weighted - Average Exercise Price Per Share, Granted | $ / shares 31.81
Weighted - Average Exercise Price Per Share, Exercised | $ / shares 26.34
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares 36.02
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 33.77
Weighted - Average Exercise Price Per Share, Exercisable at March 31, 2016 | $ / shares 32.44
Weighted Average Exercise Price Per Share, Vested and expected to vest at March 31, 2016 | $ / shares $ 33.70
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2016 6 years 4 months 24 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2016 4 years 7 months 10 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at March 31, 2016 6 years 3 months 7 days
Aggregate Intrinsic Value, Outstanding at March 31, 2016 | $ $ 3,148
Aggregate Intrinsic Value, Exercisable at March 31, 2016 | $ 2,763
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2016 | $ $ 3,102