Schedule I - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 350,697	$ 205,142	$ 203,324	$ 253,700
Other receivable	56,518	55,345
Due from related parties	1,871	2,625
Other current assets	11,817	20,941
Total current assets	691,348	750,413
Deferred tax asset, net	72,296	9,057
Total assets	1,534,387	1,508,298
Liabilities and Shareholders'/Members’ Equity (Deficit)
Accounts payable	48,935	61,149
Accrued expenses	112,281	89,601
Tax receivable agreement obligations, inclusive of related party liability of $40.7 million and zero at December 31, 2018 and 2017, respectively	47,221
Due to related parties	385	675
Total liabilities	1,386,976	1,526,563
Shareholders'/members' deficit:
Additional paid-in capital	178,176
Accumulated deficit attributable to Class A common stock	(223,799)
Accumulated other comprehensive loss	(2,993)	(67,679)
Total shareholders'/members' equity (deficit)	(48,608)	(169,843)
Total liabilities and deficit	1,534,387	1,508,298
Class A Common Stock
Shareholders'/members' deficit:
Common stock	3
Class B Common Stock
Shareholders'/members' deficit:
Common stock	4
Class C Common Stock
Shareholders'/members' deficit:
Common stock
Class D Common Stock
Shareholders'/members' deficit:
Common stock	1
Reportable Legal Entities | Parent Company
Assets
Cash and cash equivalents		127	$ 180	$ 149
Other receivable		42
Due from related parties		59
Other current assets		23
Total current assets		251
Deferred tax asset, net	68,941
Total assets	68,941	251
Liabilities and Shareholders'/Members’ Equity (Deficit)
Accounts payable		25
Accrued expenses		615
Tax receivable agreement obligations, inclusive of related party liability of $40.7 million and zero at December 31, 2018 and 2017, respectively	47,221
Net deficit in investment in a subsidiary	70,328	158,112
Due to related parties		11,342
Total liabilities	117,549	170,094
Shareholders'/members' deficit:
Additional paid-in capital	178,176
Accumulated other comprehensive loss	(2,993)	(67,679)
Total shareholders'/members' equity (deficit)	(48,608)	(169,843)
Total liabilities and deficit	68,941	251
Reportable Legal Entities | Parent Company | Class A Common Stock
Shareholders'/members' deficit:
Common stock	3
Accumulated deficit attributable to Class A common stock	(223,799)	(237,330)
Reportable Legal Entities | Parent Company | Class B Common Stock
Shareholders'/members' deficit:
Common stock	4
Reportable Legal Entities | Parent Company | Class D Common Stock
Shareholders'/members' deficit:
Common stock	1
Class A Units
Shareholders'/members' deficit:
Capital units		54,453
Class A Units | Reportable Legal Entities | Parent Company
Shareholders'/members' deficit:
Capital units		54,453
Class B Units
Shareholders'/members' deficit:
Capital units
Class C Units
Shareholders'/members' deficit:
Capital units		9,463
Class C Units | Reportable Legal Entities | Parent Company
Shareholders'/members' deficit:
Capital units		9,463
Class D Units
Shareholders'/members' deficit:
Capital units
Class E Units
Shareholders'/members' deficit:
Capital units		71,250
Class E Units | Reportable Legal Entities | Parent Company
Shareholders'/members' deficit:
Capital units		$ 71,250