Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ 1.5	$ 2.0
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	1.5	2.0
Effect of noncontrolling interest, net of tax	$ (1.3)	$ (1.6)
Weighted average shares (denominator):
Weighted average number of shares - basic (in shares)	8,617,781	8,448,719
Effect of share-based awards (in shares)	65,749	299,556
Effect of noncontrolling interest, net of tax (in shares)	6,866,154	6,866,154
Weighted average number of shares - diluted (in shares)	15,549,684	15,614,429
Basic income (loss) per share (in dollars per share)	$ 0.17	$ 0.24
Diluted income (loss) per share (in dollars per share)	$ 0.15	$ 0.19
Related party liability shares (in shares)		206,897
Class A Common Stock
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ 1.5	$ 2.0
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	1.5	2.0
Effect of noncontrolling interest, net of tax	0.9	0.9
Net income attributable to Class A Common Stock	$ 2.4	$ 2.9
Equity-Based awards
Weighted average shares (denominator):
Antidilutive securities (in shares)	700,000	1,000,000