Fair Value Measurements - Measured on Nonrecurring Basis (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Y $ / hp	Dec. 31, 2020 USD ($) $ / hp
Fair value
Goodwill impairment | $	$ 99,800	$ 99,830
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Minimum
Fair value
Measurement input			0	0
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Maximum
Fair value
Measurement input			621	289
Impaired Long-Lived Assets | Compressors | Measurement Input, Sale proceeds | Weighted average
Fair value
Measurement input			31	20
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Weighted average disposal period
Fair value
Measurement input | Y			4
Level 3 | Impaired Long-Lived Assets | Compressors | Measurement Input, Discount for market liquidity
Fair value
Measurement input			0.68	0.81
Nonrecurring Basis | Level 3 | Impaired Long-Lived Assets | Compressors
Fair value
Impaired assets | $			$ 3,896	$ 19,046