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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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