Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income attributable to Cactus Inc.	$ 6,028	$ 21,408	$ 25,011	$ 48,215
Net income attributable to non-controlling interest	2,491	0	13,657	32,204
Net income attributable to Cactus Inc. - diluted	$ 8,519	$ 21,408	$ 38,668	$ 80,419
Denominator:
Effect of dilutive shares (in shares)	27,931	264	27,994	32,507
Weighted average Class A shares outstanding - diluted (in shares)	75,367	47,145	75,347	75,326
Earnings per Class A share - basic (in dollars per share)	$ 0.13	$ 0.46	$ 0.53	$ 1.13
Earnings per Class A share - diluted (in dollars per share)	$ 0.11	$ 0.45	$ 0.51	$ 1.07
Corporate effective interest rate, if-converted method	26.00%	24.00%	26.00%	24.00%
Class A Common Stock
Denominator:
Weighted average Class A Shares Outstanding - basic (in shares)	47,436	46,881	47,353	42,819
Weighted average Class A shares outstanding - diluted (in shares)	75,367	47,145	75,347	75,326
Earnings per Class A share - basic (in dollars per share)	$ 0.13	$ 0.46	$ 0.53	$ 1.13
Earnings per Class A share - diluted (in dollars per share)	$ 0.11	$ 0.45	$ 0.51	$ 1.07
Class B Common Stock
Denominator:
Effect of dilutive shares (in shares)	27,900		27,900	32,200
Antidilutive securities excluded from computation of earnings per share		28,200