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CompressorWorks Acquisition (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Business Acquisition [Line Items]          
Purchase price excluding working capital adjustment $ 37,400,000   $ 37,400,000    
Working capital adjustment 1,200,000   1,200,000    
Revenues from the acquired business 268,875,000 244,005,000 480,586,000 464,235,000 60,000,000
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]          
Purchase price: 38,594,000   38,594,000    
Assets acquired and liabilities assumed [Abstract]          
Receivables 9,114,000   9,114,000    
Inventory 22,736,000   22,736,000    
Other current assets 60,000   60,000    
Property, plant and equipment, net 1,427,000   1,427,000    
Intangible assets 8,870,000   8,870,000    
Goodwill 9,703,000   9,703,000    
Current liabilities (13,316,000)   (13,316,000)    
Net assets acquired 38,594,000   38,594,000    
Revenues 268,875,000 244,005,000 480,586,000 464,235,000 60,000,000
Net earnings 13,404,000 13,338,000 18,598,000 20,045,000  
Pro Forma Revenues 275,613,000 274,278,000 500,328,000 515,924,000  
Pro Forma Net earnings 14,362,000 14,505,000 20,394,000 21,136,000  
Customer Relationships [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Intangible assets 8,000,000   8,000,000    
Estimated useful life of intangible assets     7 years    
Trademarks and Trade names [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Intangible assets 500,000   500,000    
Estimated useful life of intangible assets     3 years    
Non-compete Agreements [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Intangible assets 200,000   200,000    
Estimated useful life of intangible assets     3 years    
Leaseholds [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Intangible assets 200,000   200,000    
Estimated useful life of intangible assets     2 years 3 months 18 days    
CompressorWorks, Inc. [Member]
          
Business Acquisition [Line Items]          
Revenues from the acquired business     13,600,000    
Assets acquired and liabilities assumed [Abstract]          
Revenues     $ 13,600,000    
CompressorWorks, Inc. [Member] | Customer Relationships [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Estimated useful life of intangible assets     7 years    
CompressorWorks, Inc. [Member] | Non-compete Agreements [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Estimated useful life of intangible assets     3 years    
CompressorWorks, Inc. [Member] | Leaseholds [Member]
          
Assets acquired and liabilities assumed [Abstract]          
Estimated useful life of intangible assets     2 years 3 months 18 days