Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income attributable to Cactus Inc.	$ 10,393	$ 6,028	$ 21,952	$ 25,011
Net income attributable to non-controlling interest	3,332	2,491	6,091	13,657
Net income attributable to Cactus Inc. - diluted	$ 13,725	$ 8,519	$ 28,043	$ 38,668
Denominator:
Effect of dilutive shares (in shares)	20,949	27,931	23,831	27,994
Corporate effective income tax rate, if-converted method	28.00%	26.00%	28.00%	26.00%
Class A Common Stock
Denominator:
Weighted average Class A Shares Outstanding - basic (in shares)	55,048	47,436	52,124	47,353
Weighted average Class A shares outstanding - diluted (in shares)	75,997	75,367	75,955	75,347
Earnings per Class A share - basic (in dollars per share)	$ 0.19	$ 0.13	$ 0.42	$ 0.53
Earnings per Class A share - diluted (in dollars per share)	$ 0.18	$ 0.11	$ 0.37	$ 0.51
Class B Common Stock
Denominator:
Effect of dilutive shares (in shares)	20,700	27,900	23,500	27,900