Acquisitions and Dispositions (Details 1) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Aug. 04, 2014
Business Acquisition [Line Items]
Purchase price allocation, nondeductible goodwill	$ 290,960,000	$ 293,941,000
Accumulated amortization, intangible assets acquired	42,344,000	39,754,000
Compressor Systems, Inc. [Member]
Business Acquisition [Line Items]
Date of acquisition		Jul. 20, 2014
Purchase price allocation, current assets			100,928,000
Purchase price allocation, property, plant, and equipment			571,670,000
Purchase price allocation, intangible assets			68,000,000
Purchase price allocation, total assets acquired			900,634,000
Purchase price allocation, current liabilities			75,634,000
Purchase price allocation, total liabilities assumed			75,634,000
Purchase price allocation, net assets acquired			825,000,000
Purchase price allocation, deductible goodwill			160,036,000
Decrease in goodwill recorded during period	1,400,000
Revenues from acquired entitiy	71,300,000
Depreciation and amortization from acquired entity	15,800,000
Pretax earnings from acquired entity	5,800,000
Allocated interest expense excluded from results attributable to acquired entity	6,800,000
Deferred financing costs	16,600,000	9,300,000
Value of trademarks/tradenames			33,700,000
Value of customer relationships			21,400,000
Value of other intangible assets			12,900,000
Accumulated amortization, intangible assets acquired	6,200,000
CSI Compressco [Member]
Business Acquisition [Line Items]
Effective date of acquisition		Aug. 04, 2014
Purchase price		$ 825,000,000
Maximum [Member] | Finite-Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	15 years
Minimum [Member] | Finite-Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	2 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	30 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	15 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	16 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	2 years
Vehicles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	4 years
Vehicles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Acquired property, plant, and equipment, useful life	3 years