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SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
lease
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]                      
Balance at beginning of Current Period       $ 1,527       $ 1,898 $ 1,527 $ 1,898  
Accretion expense, included in depreciation and amortization expense                 121 115  
Disposals                 (272)    
Payments                 (377) (486)  
Balance at end of Current Period $ 999       $ 1,527       $ 999 1,527 $ 1,898
Lessor Income                      
Number of owned operating leases | lease                 388    
Number of subleases | lease                 14    
Sublease income                 $ 1,463 1,544  
Defined Contribution Plan                      
401(k) match expense                 0    
Payroll Tax Deferral 6,000               6,000    
PROPERTY AND EQUIPMENT                      
Depreciation and amortization                 2,872 3,860 3,176
Depreciation                 89,848 107,738 119,114
Net (loss) income attributable to Select Energy Services, Inc. $ (17,983) $ (30,541) $ (44,298) $ (245,862) $ (9,930) $ 5,379 $ 6,200 $ 1,135 $ (338,684) 2,784 36,512
Goodwill and Intangible Asset Impairment                      
Impaired asset carrying value                     2,300
Buildings and leasehold improvements                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 30 years    
Vehicles and equipment | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 4 years    
Vehicles and equipment | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 7 years    
Machinery and equipment                      
PROPERTY AND EQUIPMENT                      
Depreciation and amortization                 $ 90,200 $ 108,700 $ 120,400
Machinery and equipment | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 2 years    
Machinery and equipment | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 15 years    
Computer equipment and software | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 3 years    
Computer equipment and software | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 4 years    
Office furniture and equipment                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 7 years    
Disposal wells | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 7 years    
Disposal wells | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 10 years    
Change in useful life estimate and increased salvage value                      
PROPERTY AND EQUIPMENT                      
Earnings Per Share, Basic and Diluted | $ / shares                     $ 0.15
Depreciation                     $ 12,600
Net (loss) income attributable to Select Energy Services, Inc.                     10,900
Change in useful life estimate and increased salvage value | Vehicles and equipment                      
PROPERTY AND EQUIPMENT                      
Depreciation                     $ 3,900
Change in useful life estimate and increased salvage value | Vehicles and equipment | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 6 years    
Change in useful life estimate and increased salvage value | Vehicles and equipment | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 8 years 1 month 6 days    
Change in useful life estimate and increased salvage value | Machinery and equipment | Minimum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 5 years 6 months    
Change in useful life estimate and increased salvage value | Machinery and equipment | Maximum                      
PROPERTY AND EQUIPMENT                      
Estimated useful lives of the assets                 6 years 10 months 24 days