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Business Acquisitions (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets acquired and liabilities assumed [Abstract]                      
Revenues $ 192,355,000 $ 275,975,000 $ 268,875,000 $ 211,711,000 $ 174,170,000 $ 236,220,000 $ 244,005,000 $ 220,230,000 $ 948,916,000 $ 874,625,000 $ 810,910,000
Unaudited pro forma financial information [Abstract]                      
Revenues 192,355,000 275,975,000 268,875,000 211,711,000 174,170,000 236,220,000 244,005,000 220,230,000 948,916,000 874,625,000 810,910,000
Net earnings 5,915,000 16,840,000 13,404,000 5,194,000 29,311,000 [1] 13,045,000 [1] 13,338,000 [1] 6,707,000 [1] 41,353,000 62,401,000 21,960,000
Pro Forma Revenues                 968,658,000 963,751,000  
Pro Forma Net earnings                 43,262,000 64,331,000  
CompressorWorks, Inc. [Member]
                      
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                   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    
Intangible assets 8,870,000               8,870,000    
Revenues                 44,300,000    
Unaudited pro forma financial information [Abstract]                      
Revenues                 44,300,000    
CompressorWorks, Inc. [Member] | Customer Relationships [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 8,000,000               8,000,000    
Intangible assets 8,000,000               8,000,000    
Estimated useful life of intangible assets                 7 years    
CompressorWorks, Inc. [Member] | Trademarks And Trade Names [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 500,000               500,000    
Intangible assets 500,000               500,000    
Estimated useful life of intangible assets                 3 years    
CompressorWorks, Inc. [Member] | Non-compete Agreements [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 200,000               200,000    
Intangible assets 200,000               200,000    
Estimated useful life of intangible assets                 3 years    
CompressorWorks, Inc. [Member] | Leasehold [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 200,000               200,000    
Intangible assets 200,000               200,000    
Estimated useful life of intangible assets                 2 years 3 months 18 days    
BLD Products, Ltd [Member]
                      
Business Acquisition [Line Items]                      
Percentage of volume was sold to us (in hundredths)                 40.00%    
Revenues from the acquired business                     18,000,000
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                      
Purchase price: 26,984,000       27,000,000       26,984,000 27,000,000  
Assets acquired and liabilities assumed [Abstract]                      
Receivables 1,944,000               1,944,000    
Inventory 3,826,000               3,826,000    
Other current assets 3,000 [2]               3,000 [2]    
Property, plant and equipment, net 1,965,000               1,965,000    
Other assets 0               0    
Intangible assets 7,200,000               7,200,000    
Goodwill 12,867,000               12,867,000    
Current liabilities (821,000)               (821,000)    
Net assets acquired 26,984,000               26,984,000    
Intangible assets 7,200,000               7,200,000    
Revenues                 33,500,000    
Unaudited pro forma financial information [Abstract]                      
Revenues                 33,500,000    
BLD Products, Ltd [Member] | Customer Relationships [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 7,200,000               7,200,000    
Intangible assets 7,200,000               7,200,000    
Estimated useful life of intangible assets                 10 years 10 years  
Novo Products Inc. [Member]
                      
Business Acquisition [Line Items]                      
Percentage of entity (in hundredths) 100.00%               100.00%    
Forecast Trading Corporation [Member]
                      
Business Acquisition [Line Items]                      
Revenues from the acquired business                 28,000,000    
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                      
Purchase price: 44,250,000       44,300,000       44,250,000 44,300,000  
Assets acquired and liabilities assumed [Abstract]                      
Receivables 6,300,000               6,300,000    
Inventory 10,120,000               10,120,000    
Other current assets 700,000 [2]               700,000 [2]    
Property, plant and equipment, net 3,840,000               3,840,000    
Other assets 10,000               10,000    
Intangible assets 15,300,000               15,300,000    
Goodwill 11,820,000               11,820,000    
Current liabilities (3,840,000)               (3,840,000)    
Net assets acquired 44,250,000               44,250,000    
Intangible assets 15,300,000               15,300,000    
Revenues                 11,800,000    
Unaudited pro forma financial information [Abstract]                      
Revenues                 11,800,000    
Forecast Trading Corporation [Member] | Customer Relationships [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 13,800,000               13,800,000    
Intangible assets 13,800,000               13,800,000    
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Minimum [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Estimated useful life of intangible assets                 7 years 7 years  
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Maximum [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Estimated useful life of intangible assets                 10 years 10 years  
Forecast Trading Corporation [Member] | Trademarks And Trade Names [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 800,000               800,000    
Intangible assets 800,000               800,000    
Estimated useful life of intangible assets                 10 years    
Forecast Trading Corporation [Member] | Non-compete Agreements [Member]
                      
Assets acquired and liabilities assumed [Abstract]                      
Intangible assets 700,000               700,000    
Intangible assets $ 700,000               $ 700,000    
Estimated useful life of intangible assets                 5 years 5 years  
[1] In December 2011, we realized a non-recurring non-cash benefit of $21.5 million in our tax provision related to a reduction of a significant portion of our deferred tax valuation allowance on net U.S. deferred tax assets.
[2] The other current assets balance for Forecast Trading Corporation includes $0.7 million of cash acquired.