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SEGMENT INFORMATION - Total Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Assets $ 1,377,177 $ 1,360,605
Operating segment | Water services    
Segment Reporting Information [Line Items]    
Assets 873,107 865,992
Operating segment | Water infrastructure    
Segment Reporting Information [Line Items]    
Assets 312,638 250,207
Operating segment | Oilfield chemicals    
Segment Reporting Information [Line Items]    
Assets 171,457 173,762
Operating segment | Other    
Segment Reporting Information [Line Items]    
Assets $ 19,975 $ 70,644