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BUSINESS AND BASIS OF PRESENTATION (Details)						6 Months Ended	12 Months Ended
	Nov. 01, 2017 USD ($)	Sep. 15, 2017 USD ($)	Apr. 26, 2017 shares	Mar. 10, 2017 USD ($)	Dec. 20, 2016 $ / shares shares	Jun. 30, 2019 USD ($) item segment $ / shares shares	Dec. 31, 2017 item	Dec. 31, 2018 $ / shares shares	Dec. 31, 2016 shares
Common units issued					16,100,000
Financial Designation, Predecessor and Successor [Fixed List]					Predecessor
Number of tax receivable agreements | $						$ 2
Number of business combinations | item							3
Number of cost-method investee | item						1
Number of operating segments | segment						3
Number of reportable segments | segment						3
Class A-1 Common Stock
Par value | $ / shares					$ 0.01
Class A-1 Common Stock | Private Placement
Shares issued					16,100,000
Conversion rate per share									1
Class A Common Stock
Par value | $ / shares					$ 0.01	$ 0.01		$ 0.01
Common stock issued						80,176,078		78,956,555
Class A Common Stock | IPO
Shares issued			8,700,000
Class B Common Stock
Par value | $ / shares					$ 0.01	$ 0.01		$ 0.01
Common stock issued					38,462,541	26,026,843		26,026,843
GRR Acquisition
Total consideration transferred | $				$ 59,600,000
Resource Water Acquisition
Total consideration transferred | $		$ 9,000,000.0
Rockwater Merger
Total consideration transferred | $	$ 620,200,000

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