Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) offering $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $	$ 15.2
Period of expense of unrecognized compensation cost, years	3 years 6 months
Common stock reserved for future issuance (in shares)	3,700,000
Shares available for future grant (in shares)	700,000
Maximum term of grants	10 years
Options vested and exercisable, period	5 years
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares	$ 8.52	$ 7.46
Aggregate intrinsic value of stock options exercised | $	$ 3.5	$ 1.7
Supplemental Employee Retirement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)	1,000,000
Remaining shares authorized for issuance (in shares)	400,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	0	44,000
Weighted average grant date fair value of restricted stock granted (in dollars per share) | $ / shares	$ 0.00	$ 34.14
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	81,000	0
Weighted average grant date fair value of restricted stock granted (in dollars per share) | $ / shares	$ 39.38
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in shares)	2,300,000
Number of additional offerings | offering	5
Requisite service period for plan participation eligibility	2 years
Stock options authorized to issue to employees (in shares)	4,100,000