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Goodwill and Other Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill by operating segment [Abstract]      
Goodwill gross, Beginning balance $ 64,612,000 $ 39,925,000  
Goodwill accumulated impairment loss, Beginning balance (38,488,000) (38,488,000)  
Goodwill net, Beginning balance 26,124,000 1,437,000  
Goodwill gross, Ending balance 74,315,000 64,612,000 39,925,000
Goodwill accumulated impairment loss, Ending balance (38,488,000) (38,488,000) (38,488,000)
Goodwill net, Ending balance 35,827,000 26,124,000 1,437,000
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 48,693,000 39,823,000  
Less accumulated amortization (14,210,000) [1] (9,467,000) [1]  
Net acquired intangible assets 34,483,000 30,356,000  
Amortization of acquired intangible assets [Abstract]      
Amortization expense 4,700,000 2,100,000 1,200,000
Estimated amortization expense in year 2013 4,700,000    
Estimated amortization expense in year 2014 4,100,000    
Estimated amortization expense in year 2015 3,900,000    
Estimated amortization expense in years 2016 through 2028 16,600,000    
Other intangible assets 17,300,000 16,100,000  
Accumulated computer software amortization 15,200,000 14,700,000  
Customer Relationships [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 40,100,000 32,100,000  
Trademarks and Trade Names [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 6,800,000 6,300,000  
Non-compete Agreements [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 910,000 700,000  
Patents and Supply Contracts [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 723,000 723,000  
Leaseholds [Member]
      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 160,000 0  
Computer Software [Member]
      
Amortization of acquired intangible assets [Abstract]      
Amortization of computer software 500,000 700,000 1,100,000
Computer Software [Member] | Minimum [Member]
      
Intangible assets acquired [Abstract]      
Estimated useful life of intangible assets 3 years    
Computer Software [Member] | Maximum [Member]
      
Intangible assets acquired [Abstract]      
Estimated useful life of intangible assets 10 years    
Dana Acquisition [Member] | Trademarks and Trade Names [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired indefinite-lived intangible assets 5,200,000    
BLD Products, Ltd [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   12,867,000  
Purchase price paid in cash 26,984,000 27,000,000  
BLD Products, Ltd [Member] | Customer Relationships [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets   7,200,000  
Estimated useful life of intangible assets 10 years 10 years  
Forecast Trading Corporation [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   11,820,000  
Purchase price paid in cash 44,250,000 44,300,000  
Forecast Trading Corporation [Member] | Customer Relationships [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets   13,800,000  
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Minimum [Member]
      
Intangible assets acquired [Abstract]      
Estimated useful life of intangible assets 7 years 7 years  
Forecast Trading Corporation [Member] | Customer Relationships [Member] | Maximum [Member]
      
Intangible assets acquired [Abstract]      
Estimated useful life of intangible assets 10 years 10 years  
Forecast Trading Corporation [Member] | Trademarks and Trade Names [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets   800,000  
Estimated useful life of intangible assets   10 years  
Forecast Trading Corporation [Member] | Non-compete Agreements [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets   700,000  
Estimated useful life of intangible assets 5 years 5 years  
CompressorWorks, Inc. [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period 9,703,000    
Purchase price paid in cash 38,594,000    
Purchase price excluding working capital adjustment 37,400,000    
Working capital adjustment 1,200,000    
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets 8,900,000    
CompressorWorks, Inc. [Member] | Customer Relationships [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets 8,000,000    
Estimated useful life of intangible assets 7 years    
CompressorWorks, Inc. [Member] | Trademarks and Trade Names [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets 500,000    
Estimated useful life of intangible assets 3 years    
CompressorWorks, Inc. [Member] | Non-compete Agreements [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets 200,000    
Estimated useful life of intangible assets 3 years    
CompressorWorks, Inc. [Member] | Leaseholds [Member]
      
Intangible assets acquired [Abstract]      
Amount of acquired intangible assets 200,000    
Estimated useful life of intangible assets 2 years 3 months 18 days    
Engine Management [Member]
      
Goodwill [Line Items]      
Percentage in excess of its carrying amount (in hundredths) 70.00%    
Goodwill by operating segment [Abstract]      
Goodwill gross, Ending balance 64,612,000 64,612,000 39,925,000
Goodwill accumulated impairment loss, Ending balance (38,488,000) (38,488,000) (38,488,000)
Goodwill net, Ending balance 26,124,000 26,124,000 1,437,000
Engine Management [Member] | BLD Products, Ltd [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   12,867,000  
Engine Management [Member] | Forecast Trading Corporation [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   11,820,000  
Engine Management [Member] | CompressorWorks, Inc. [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period 0    
Temperature Control [Member]
      
Goodwill [Line Items]      
Percentage in excess of its carrying amount (in hundredths) 60.00%    
Goodwill by operating segment [Abstract]      
Goodwill gross, Ending balance 9,703,000 0 0
Goodwill accumulated impairment loss, Ending balance 0 0 0
Goodwill net, Ending balance 9,703,000 0 0
Temperature Control [Member] | BLD Products, Ltd [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   0  
Temperature Control [Member] | Forecast Trading Corporation [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period   0  
Temperature Control [Member] | CompressorWorks, Inc. [Member]
      
Goodwill by operating segment [Abstract]      
Goodwill acquired during period $ 9,703,000    
[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.