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Stockholders' Equity - Schedule of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2016 1,540,000
Number of Shares, Granted 0
Number of Shares, Exercised (512,000)
Number of Shares, Forfeited (91,000)
Number of Shares, Outstanding at December 31, 2017 937,000
Number of Shares, Exercisable at December 31, 2017 650,000
Number of Shares, Vested and expected to vest at December 31, 2017 937,000
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares $ 34.35
Weighted - Average Exercise Price Per Share, Exercised | $ / shares 32.90
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares 34.87
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares 35.10
Weighted - Average Exercise Price Per Share, Exercisable at December 31, 2017 | $ / shares 34.98
Weighted - Average Exercise Price Per Share, Vested and expected to vest at December 31, 2017 | $ / shares $ 35.10
Weighted - Average Remaining Contractual Term, Outstanding at December 31, 2017 5 years 10 months 9 days
Weighted - Average Remaining Contractual Term, Exercisable at December 31, 2017 5 years 1 month 28 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at December 31, 2017 5 years 10 months 9 days
Aggregate Intrinsic Value, Outstanding at December 31, 2017 | $ $ 8,529
Aggregate Intrinsic Value, Exercisable at December 31, 2017 | $ 5,992
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2017 | $ $ 8,529