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SEGMENT INFORMATION - Revenue by product (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 133,339	$ 101,242	$ 92,239	$ 278,285	$ 276,088	$ 328,968	$ 323,887	$ 362,646	$ 605,105	$ 1,291,589	$ 1,528,930
Oilfield chemicals
Segment Reporting Information [Line Items]
Revenue									160,825	268,963	260,281
Water transfer
Segment Reporting Information [Line Items]
Revenue									146,728	355,535	443,650
Pipeline logistics and disposal
Segment Reporting Information [Line Items]
Revenue									91,971	101,145	100,172
Accommodations and rentals
Segment Reporting Information [Line Items]
Revenue									62,593	150,793	153,013
Accommodations and rentals | ASC 842
Segment Reporting Information [Line Items]
Revenue									28,400	69,000	67,200
Flowback and well testing
Segment Reporting Information [Line Items]
Revenue									61,839	208,572	223,828
Fluid hauling
Segment Reporting Information [Line Items]
Revenue									52,748	63,156	79,568
Water Sourcing
Segment Reporting Information [Line Items]
Revenue									33,739	120,517	129,958
Eliminations and other service lines
Segment Reporting Information [Line Items]
Revenue									$ (5,338)	$ 22,908	$ 138,460

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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