Basis of Presentation and Nature of Operations - Schedule of Impact to Consolidated Balance Sheets Before and After the Adoption (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets	$ 127,587
Operating lease liabilities - current	30,324
Accrued expenses and other current liabilities	27,902		$ 39,072
Operating lease liabilities - non-current	$ 112,676
Deferred rent			$ 13,938
Accounting Standards Update 2016-02
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets		$ 137,152
Operating lease liabilities - current		30,951
Operating lease liabilities - non-current		121,982
Accounting Standards Update 2016-02 | Before Adoption
Basis of Presentation and Nature of Operations [Line Items]
Accrued expenses and other current liabilities		1,843
Deferred rent		13,938
Accounting Standards Update 2016-02 | Adoption Adjustments
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets		137,152
Operating lease liabilities - current		30,951
Accrued expenses and other current liabilities		(1,843)
Operating lease liabilities - non-current		121,982
Deferred rent		$ (13,938)