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Related Party Transactions (Details) $ in Millions			3 Months Ended		6 Months Ended
Related Party Transactions (Details) $ in Millions	Feb. 12, 2018	Feb. 11, 2018 USD ($) item	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Tax savings payable to TRA Holders (as a percent)	85.00%
Cactus LLC
Related Party Transaction [Line Items]
Distribution received from subsidiary			$ 2.3
Certain direct and indirect holders of CW Units
Related Party Transaction [Line Items]
Tax savings payable to TRA Holders (as a percent)	85.00%
Management service agreement \| Cactus LLC
Related Party Transaction [Line Items]
Number of LLC members \| item		2
Annual management services fee total		$ 0.3
Number of installments \| item		4
Expenses under related party agreements						$ 0.2
Accounts payable to related party			0.0		$ 0.0		$ 0.0
Management service agreement \| Maximum \| Cactus LLC
Related Party Transaction [Line Items]
Expenses under related party agreements					0.1
Short-term rental agreement \| Cactus LLC
Related Party Transaction [Line Items]
Expenses under related party agreements			0.1	$ 0.1	0.1	$ 0.2
Short-term rental agreement \| Maximum \| Cactus LLC
Related Party Transaction [Line Items]
Accounts payable to related party			0.1		$ 0.1		$ 0.1
Cactus LLC
Related Party Transaction [Line Items]
Distributions to LLC members made by subsidiary			$ 4.2