Revenue from Contract with Customers - Disaggregate Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) hp	Jun. 30, 2021 USD ($) hp	Jun. 30, 2022 USD ($) hp	Jun. 30, 2021 USD ($) hp
Disaggregation of Revenue
Revenue	$ 215,828	$ 195,615	$ 413,029	$ 391,046
Contract Operations
Disaggregation of Revenue
Revenue	166,298	163,865	329,954	329,899
Contract Operations | Transferred at Point in Time
Disaggregation of Revenue
Revenue	900	1,400	1,100	2,400
Contract Operations | 0 - 1,000 horsepower per unit
Disaggregation of Revenue
Revenue	$ 40,489	$ 45,918	$ 82,331	$ 92,837
Contract Operations | 0 - 1,000 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor unit horsepower (horsepower) | hp	0	0	0	0
Contract Operations | 0 - 1,000 horsepower per unit | Maximum
Disaggregation of Revenue
Compressor unit horsepower (horsepower) | hp	1,000	1,000	1,000	1,000
Contract Operations | 1,001 - 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 68,697	$ 66,852	$ 135,698	$ 135,316
Contract Operations | 1,001 - 1,500 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor unit horsepower (horsepower) | hp	1,001	1,001	1,001	1,001
Contract Operations | 1,001 - 1,500 horsepower per unit | Maximum
Disaggregation of Revenue
Compressor unit horsepower (horsepower) | hp	1,500	1,500	1,500	1,500
Contract Operations | Over 1,500 horsepower per unit
Disaggregation of Revenue
Revenue	$ 56,885	$ 50,939	$ 111,479	$ 101,342
Contract Operations | Over 1,500 horsepower per unit | Minimum
Disaggregation of Revenue
Compressor unit horsepower (horsepower) | hp	1,500	1,500	1,500	1,500
Contract Operations | Other
Disaggregation of Revenue
Revenue	$ 227	$ 156	$ 446	$ 404
Aftermarket Services
Disaggregation of Revenue
Revenue	49,530	31,750	83,075	61,147
Aftermarket Services | Services
Disaggregation of Revenue
Revenue	26,001	17,008	43,138	33,900
Aftermarket Services | OTC parts and components sales
Disaggregation of Revenue
Revenue	$ 23,529	$ 14,742	$ 39,937	$ 27,247