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Organization and Nature of Operations - IPO and TRA (Details) $ / shares in Units, $ in Millions |  |  |  | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 16, 2018 shares | Feb. 14, 2018 USD ($) shares | Feb. 12, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2018 Center $ / shares | Dec. 31, 2017 USD ($)
Organization and Nature of Operations |  |  |  |  |  |
Number of U.S. service centers | Center |  |  |  |  | 15 |
Number of service centers in Eastern Australia | Center |  |  |  |  | 1 |
Initial Public Offering |  |  |  |  |  |
Offering costs | $ |  |  |  | $ 2.8 |  | $ 2.2
Tax Receivable Agreement |  |  |  |  |  |
Tax savings payable to TRA Holders (as a percent) | 85.00% |  | 85.00% |  |  |
Tax savings benefit recorded as APIC (as a percent) |  |  | 15.00% |  |  |
Cactus LLC |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Net proceeds from IPO | $ |  |  | $ 469.6 |  |  |
Cactus LLC | Term loan facility |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Repayments of debt | $ |  |  | 251.0 |  |  |
Cactus LLC |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Ownership interest |  |  |  | 50.30% | 50.30% |
Members' Equity (Deficit) | Cactus LLC |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Redeem CW Units from certain direct and indirect owners | $ |  |  | $ 216.4 |  |  |
Redeem CW Units from certain direct and indirect owners (in units) | shares |  |  | 8,667,841 |  |  |
Class A Common Stock |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Class B Common Stock |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Number of shares issued | shares |  |  | 51,889,772 |  |  |
Common stock, par value | $ / shares |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Redeem CW Units from certain direct and indirect owners (in units) | shares | 11,196,562 |  |  |  |  |
Class B Common Stock | Cactus LLC |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Redeem CW Units from certain direct and indirect owners (in units) | shares |  | 3,450,000 |  |  |  |
IPO | Class A Common Stock |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Number of shares issued | shares |  |  | 23,000,000 |  |  |
Common stock, par value | $ / shares |  |  | $ 0.01 |  |  |
Price per share | $ / shares |  |  | $ 19.00 |  |  |
Net proceeds from IPO | $ |  |  | $ 408.0 |  |  |
Underwriter's option | Class A Common Stock |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |
Number of shares issued | shares | 1,196,562 | 3,450,000 |  |  |  |
Net proceeds from IPO | $ |  | $ 61.6 |  |  |  |

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