Stockholders' Equity - Schedule of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding at December 31, 2014 | shares	1,954
Number of Shares, Granted | shares	462
Number of Shares, Exercised | shares	(67)
Number of Shares, Forfeited | shares	(178)
Number of Shares, Outstanding at December 31, 2015 | shares	2,171
Number of Shares, Exercisable at December 31, 2015 | shares	1,101
Number of Shares, Vested and expected to vest at December 31, 2015 | shares	2,059
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance | $ / shares	$ 33.81
Weighted - Average Exercise Price Per Share, Granted | $ / shares	33.70
Weighted - Average Exercise Price Per Share, Exercised | $ / shares	28.76
Weighted - Average Exercise Price Per Share, Forfeited | $ / shares	35.01
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance | $ / shares	33.84
Weighted - Average Exercise Price Per Share, Exercisable at December 31, 2015 | $ / shares	32.30
Weighted Average Exercise Price Per Share, Vested and expected to vest at December 31, 2015 | $ / shares	$ 33.76
Weighted - Average Remaining Contractual Term, Outstanding at December 31, 2015	6 years 9 months 11 days
Weighted - Average Remaining Contractual Term, Exercisable at December 31, 2015	4 years 11 months 27 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at December 31, 2015	6 years 7 months 28 days
Aggregate Intrinsic Value, Outstanding at December 31, 2014 | $	$ 701
Aggregate Intrinsic Value, Exercisable at December 31, 2015 | $	673
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2015 | $	$ 699