Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Segment shares	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of operating segment | Segment	1
Debt and capital lease obligations	$ 45,000,000		$ 45,000,000
Long-term debt, fair value	46,000,000		$ 45,600,000
Operating lease, right-of-use asset	$ 67,800,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating lease, liability	$ 68,953,000
Accounting Standards Update 2016-02 [Member]
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset		$ 68,000,000
Operating lease, liability		$ 69,100,000
Repurchase Program [Member]
Significant Accounting Policies [Line Items]
Stock repurchased and retired during period, shares | shares	221,809
Stock repurchased and retired during period, value	$ 30,600,000
Stock repurchase program, remaining authorized repurchase amount	101,100,000
Repurchase Program [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Stock repurchase program, authorized amount	$ 250,000,000