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Property and Equipment and Identifiable Intangible Assets - Property and Equipment (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) item hp	Sep. 30, 2019 USD ($) item hp	Sep. 30, 2018 USD ($) item hp	Dec. 31, 2018 USD ($)
Property and Equipment
Property and equipment, gross	$ 3,459,936		$ 3,459,936		$ 3,343,024
Less accumulated depreciation and amortization	(962,480)		(962,480)		(821,536)
Property and equipment, net	2,497,456		2,497,456		2,521,488
Depreciation expense	50,200	$ 51,500	151,200	$ 136,000
(Loss) gain on disposition of assets	2,000	$ (1,300)	$ 400	$ (12,300)
Number of compressor units that are to be retired or sold or reutilized | item		18	14	18
Number of horsepower that are to be retired or sold or reutilized | hp		5,800	4,700	5,800
Impairment of long-lived assets		$ 2,292	$ 3,234	$ 2,292
Accounts payable and accrued liabilities
Property and Equipment
Purchases of property and equipment			11,700		7,900
Compression and treating equipment
Property and Equipment
Property and equipment, gross	3,355,314		3,355,314		3,239,831
Impairment of long-lived assets	0		$ 3,200
Newly acquired compression equipment
Property and Equipment
Estimated useful lives			25 years
Furniture and fixtures
Property and Equipment
Property and equipment, gross	1,325		$ 1,325		1,129
Automobiles and vehicles
Property and Equipment
Property and equipment, gross	31,869		31,869		32,490
Computer equipment
Property and Equipment
Property and equipment, gross	57,133		57,133		54,806
Buildings
Property and Equipment
Property and equipment, gross	8,639		$ 8,639		9,314
Estimated useful lives			5 years
Land
Property and Equipment
Property and equipment, gross	77		$ 77		77
Leasehold improvements
Property and Equipment
Property and equipment, gross	$ 5,579		$ 5,579		$ 5,377
Estimated useful lives			5 years
Minimum | Used compression equipment
Property and Equipment
Estimated useful lives			5 years
Minimum | Furniture and fixtures | Estimated useful lives
Property and Equipment
Estimated useful lives			3 years
Minimum | Vehicles and computer equipment
Property and Equipment
Estimated useful lives			1 year
Maximum | Used compression equipment
Property and Equipment
Estimated useful lives			25 years
Maximum | Furniture and fixtures | Estimated useful lives
Property and Equipment
Estimated useful lives			10 years
Maximum | Vehicles and computer equipment
Property and Equipment
Estimated useful lives			10 years

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