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Acquired Intangible Assets (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets $ 48,693,000   $ 48,693,000   $ 39,823,000
Less accumulated amortization (11,597,000) [1]   (11,597,000) [1]   (9,467,000) [1]
Net acquired intangible assets 37,096,000   37,096,000   30,356,000
Amortization of acquired intangible assets [Abstract]          
Amortization expense 1,200,000 400,000 2,100,000 800,000  
Estimated amortization expense, remainder of current year 2,600,000   2,600,000    
Estimated amortization expense in year 2013 4,700,000   4,700,000    
Estimated amortization expense in year 2014 4,100,000   4,100,000    
Estimated amortization expense in years 2015 through 2028 20,500,000   20,500,000    
Customer Relationships [Member]
          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 40,100,000   40,100,000   32,100,000
Intangible assets acquired [Abstract]          
Estimated useful life of intangible assets     7 years    
Customer Relationships [Member] | CompressorWorks, Inc. [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired intangible assets 8,000,000   8,000,000    
Estimated useful life of intangible assets     7 years    
Trademarks and Trade Names [Member]
          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 6,800,000   6,800,000   6,300,000
Trademarks and Trade Names [Member] | Dana Acquisition [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired indefinite-lived intangible assets 5,200,000   5,200,000    
Trademarks and Trade Names [Member] | CompressorWorks, Inc. [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired intangible assets 500,000   500,000    
Estimated useful life of intangible assets     3 years    
Non-compete Agreements [Member]
          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 910,000   910,000   700,000
Intangible assets acquired [Abstract]          
Estimated useful life of intangible assets     3 years    
Non-compete Agreements [Member] | CompressorWorks, Inc. [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired intangible assets 200,000   200,000    
Estimated useful life of intangible assets     3 years    
Patents and Supply Contracts [Member]
          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 723,000   723,000   723,000
Leaseholds [Member]
          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Total acquired intangible assets 160,000   160,000   0
Intangible assets acquired [Abstract]          
Estimated useful life of intangible assets     2 years 3 months 18 days    
Leaseholds [Member] | CompressorWorks, Inc. [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired intangible assets 200,000   200,000    
Estimated useful life of intangible assets     2 years 3 months 18 days    
CompressorWorks, Inc. [Member]
          
Intangible assets acquired [Abstract]          
Amount of acquired intangible assets $ 8,900,000   $ 8,900,000    
[1] Applies to all intangible assets, except for the Dana acquisition related trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.