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Organization and Nature of Operations - Redemptions and ownership (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 21, 2019
Mar. 20, 2019
Feb. 12, 2018
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Feb. 11, 2018
Redemptions of CW Units                
CW Unit redemptions         700 (742) (7)  
Reduction of non-controlling interest for correction of follow-on offering reclassification           $ 14,500    
Increase to equity from reclassification adjustment to follow-on offering           14,000    
Increase to AOCL from reclassification adjustment to follow-on offering           $ 500    
Tax Receivable Agreement (TRA)                
Tax savings payable to TRA Holders (as a percent)     85.00%          
Portion of net cash savings per tax agreement retained by entity     15.00%          
Cactus LLC                
Ownership                
Ownership percentage           62.70% 50.30%  
Cactus LLC                
Redemptions of CW Units                
Increase to equity in non-controlling interest           $ 48,300    
March 2019 Secondary Offering                
Redemptions of CW Units                
CW Unit redemptions   8,500   (8,474)        
March 2019 Secondary Offering | Other income (expense)                
Redemptions of CW Units                
Offering expenses       $ 1,000        
Class A Common Stock                
Redemptions of CW Units                
Number of shares issued         700      
Ownership                
Common stock, shares outstanding         47,093 47,093 37,654 0
Voting power of shares outstanding as a percent of the total shares outstanding           62.70%    
Class A Common Stock | March 2019 Secondary Offering                
Redemptions of CW Units                
Number of shares issued 8,500              
Number of shares sold by certain other selling stockholders   26            
Class B Common Stock                
Redemptions of CW Units                
Common stock redeemed (in shares)   8,500     700      
Number of shares canceled         700      
Economic interest of shares         $ 0 $ 0    
Ownership                
Common stock, shares outstanding         28,020 28,020 37,236 0
Voting power of shares outstanding as a percent of the total shares outstanding           37.30%    
Class B Common Stock | March 2019 Secondary Offering                
Redemptions of CW Units                
Number of shares canceled 8,500