Stockholders' Equity - Schedule of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 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	(63)
Number of Shares, Forfeited | shares	(21)
Number of Shares, Outstanding at March 31, 2017 | shares	1,456
Number of Shares, Exercisable at March 31, 2017 | shares	856
Number of Shares, Vested and expected to vest at March 31, 2017 | shares	1,456
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares	$ 34.35
Weighted - Average Exercise Price Per Share, Exercised | $ / shares	30.15
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares	33.86
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares	34.54
Weighted - Average Exercise Price Per Share, Exercisable at March 31, 2017 | $ / shares	33.80
Weighted - Average Exercise Price Per Share, Vested and expected to vest at March 31, 2017 | $ / shares	$ 34.54
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2017	6 years 3 months 15 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2017	5 years 2 months 5 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at March 31, 2017	6 years 3 months 15 days
Aggregate Intrinsic Value, Outstanding at March 31, 2017 | $	$ 7,605
Aggregate Intrinsic Value, Exercisable at March 31, 2017 | $	5,094
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2017 | $	$ 7,605