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Significant Accounting Policies - Fair Value (Details) - Solaris Midstream Holdings, LLC and Subsidiaries - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying Amount | Level 2 | Sustainability-Linked Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 400,000  
Carrying Amount | Level 3 | Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt   $ 297,000
Fair Value | Level 2 | Sustainability-Linked Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 429,500  
Fair Value | Level 3 | Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt   $ 297,000