Condensed Consolidated Statement Stockholders' Deficit - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Additional Paid-in Capital	Retained Earnings	Non-controlling Interest	Class A common stock	Class B common stock	Class C common stock	Total
Balance at Dec. 31, 2016	$ (30,006)	$ 71	$ (114,397)	$ 189	$ 6		$ (144,137)
Balance (in shares) at Dec. 31, 2016				18,935,916	62,002,729	1
Increase (Decrease) in Members' Equity (Deficit)
Issuance of Class A common stock sold in a public offering, net of underwriting discounts, commissions and offering costs	121,399			$ 46			121,445
Issuance of Class A common stock sold in a public offering, net of underwriting discounts, commissions and offering costs (in shares)				4,600,000
Non-controlling interest adjustment for purchase of common units from CWGS, LLC with proceeds from a public offering	(87,203)		87,203
Issuance of Class A common stock for an acquisition by a subsidiary	5,719			$ 1			5,720
Issuance of Class A common stock for an acquisition by a subsidiary (in shares)				164,000
Non-controlling interest adjustment for capital contribution of Class A common stock for an acquisition by a subsidiary	(3,678)		3,678
Equity-based compensation	2,792						2,792
Redemption of LLC common units for Class A common stock	67,471		5,191	$ 66			72,728
Redemption of LLC common units for Class A common stock (in shares)				6,526,000	(4,972,000)
Distributions to holders of LLC Units			(124,996)				(124,996)
Dividends		(11,874)					(11,874)
Establishment of liabilities under the Tax Receivable Agreement and related changes to deferred tax assets associated with that liability	(55,858)						(55,858)
Non-controlling interest adjustment	(6,714)		6,714
Net income		46,455	192,013	$ 238,468			238,468
Balance at Sep. 30, 2017	$ 13,922	$ 34,652	$ 55,406	$ 302	$ 6		$ 104,288
Balance (in shares) at Sep. 30, 2017				30,227,061	57,031,184	1