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Preparation of Interim Financial Statements and Other Items - Ownership interest (Details) - Cactus LLC | Sep. 30, 2018 | Jul. 16, 2018 | Feb. 12, 2018
--- | --- | --- | ---
Other Ownership Interests [Line Items] |  |  |
Ownership interest (as a percent) | 50.30% |  |
Cactus Inc | IPO |  |  |
Other Ownership Interests [Line Items] |  |  |
Ownership interest (as a percent) |  |  | 35.30%
Non-controlling interest owned (as a percentage) |  |  | 64.70%
Cactus Inc | Follow-on Offering |  |  |
Other Ownership Interests [Line Items] |  |  |
Ownership interest (as a percent) |  | 50.30% |
Non-controlling interest owned (as a percentage) |  | 49.70% |

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