IMPAIRMENTS AND OTHER COSTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			$ 276,016	$ 4,396
Impairment and abandonment of property and equipment	$ 4,726	$ 374	7,910	893
Severance Costs	3,666		7,168	1,680
Yard closure costs	1,011		2,961
Lease Abandonment Costs	868	183	1,821	1,256
Accrued severance	1,800		1,800
Water Services
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			186,468
Impairment and abandonment of property and equipment	1,396		3,894
Severance Costs	2,746		4,569
Yard closure costs	695		2,645
Lease Abandonment Costs	848	218	1,783	447
Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			80,466
Impairment and abandonment of property and equipment	3,330		4,016
Severance Costs	212		500
Lease Abandonment Costs			51
Oilfield Chemicals
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			9,082
Severance Costs	693		813
Yard closure costs	316		316
Lease Abandonment Costs	42	7	42	7
Other
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name				4,396
Impairment and abandonment of property and equipment		374		893
Severance Costs	15		1,286	1,680
Lease Abandonment Costs	(22)	$ (42)	(55)	802
Costs of revenue
Restructuring Cost and Reserve [Line Items]
Severance Costs	2,200		4,000
Yard closure costs	1,000		3,000
Lease Abandonment Costs			1,800
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1,500		$ 3,200	$ 1,700