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Retirement of Long-Lived Assets (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
compressor
Dec. 31, 2015
USD ($)
compressor
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Loss on retirement of rental equipment $ 0 $ 545 $ 4,370
Rental Compressor Unit      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Estimated fair value of long-lived assets   $ 242 $ 967
Rental Compressor Unit      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Number of rental compressors that are not of demanded type, configuration, make or model | compressor   63 258
Rental Compressor Unit | Loss on Retirement of Rental Equipment      
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]      
Loss on retirement of rental equipment   $ 545 $ 4,400