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Organization and Nature of Operations - Secondary offering and ownership (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 21, 2019
Mar. 20, 2019
Feb. 12, 2018
Mar. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Feb. 11, 2018
Redemptions of CW Units              
CW Unit redemptions         (43,820) (7,068)  
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              
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         61.80% 50.30%  
Cactus LLC              
Redemptions of CW Units              
Increase to equity in non-controlling interest         $ 43,900    
March 2019 Secondary Offering              
Redemptions of CW Units              
CW Unit redemptions   8,473,913   (8,473,913)      
Offering expenses       $ 1,000 $ 1,000    
Class A Common Stock              
Ownership              
Common stock, shares outstanding       46,390,804 46,390,804 37,654,000 0
Voting power of shares outstanding as a percent of the total shares outstanding         61.80%    
Class A Common Stock | March 2019 Secondary Offering              
Redemptions of CW Units              
Number of shares issued 8,473,913            
Number of shares sold by certain other selling stockholders   26,087          
Class B Common Stock              
Redemptions of CW Units              
Common stock redeemed (in shares)   8,473,913          
Economic interest of shares       $ 0 $ 0    
Ownership              
Common stock, shares outstanding       28,718,409 28,718,409 37,236,000 0
Voting power of shares outstanding as a percent of the total shares outstanding         38.20%    
Class B Common Stock | March 2019 Secondary Offering              
Redemptions of CW Units              
Number of shares canceled 8,473,913