Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ (4.9)	$ 1.0	$ (3.4)	$ 3.0
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	(4.9)	1.0	(3.4)	3.0
Effect of noncontrolling interest, net of tax	$ 4.0	$ (0.8)	$ 2.7	$ (2.4)
Weighted average shares (denominator):
Weighted average number of shares - basic (in shares)	8,474,077	8,514,495	8,545,925	8,481,788
Effect of share-based awards (in shares)	0	31,782	0	13,220
Effect of noncontrolling interest, net of tax (in shares)	0	6,866,154	0	6,866,154
Weighted average number of shares - diluted (in shares)	8,474,077	15,412,431	8,545,925	15,361,162
Basic income (loss) per share (in dollars per share)	$ (0.58)	$ 0.12	$ (0.40)	$ 0.35
Diluted income (loss) per share (in dollars per share)	$ (0.58)	$ 0.10	$ (0.40)	$ 0.29
Equity-Based awards
Weighted average shares (denominator):
Antidilutive securities (in shares)	900,000		900,000
Convertible Common Stock
Weighted average shares (denominator):
Antidilutive securities (in shares)	6,900,000		6,900,000
Class A Common Stock
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ (4.9)	$ 1.0	$ (3.4)	$ 3.0
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	(4.9)	1.0	(3.4)	3.0
Effect of noncontrolling interest, net of tax	0.0	0.5	0.0	1.4
Net income (loss) attributable to Class A Common Stock	$ (4.9)	$ 1.5	$ (3.4)	$ 4.4