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Business Acquisitions and Investments (Details)
 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Dec. 31, 2012
USD ($)
Jun. 30, 2013
Orange Electronic Co., Ltd [Member]
USD ($)
Jan. 31, 2013
Orange Electronic Co., Ltd [Member]
Feb. 28, 2013
Standard Motor Products Holdings Ltd [Member]
USD ($)
Jun. 30, 2013
Standard Motor Products Holdings Ltd [Member]
USD ($)
Jun. 30, 2013
Standard Motor Products Holdings Ltd [Member]
GBP (£)
Jun. 30, 2013
Standard Motor Products Holdings Ltd [Member]
Minimum [Member]
USD ($)
Jun. 30, 2013
Standard Motor Products Holdings Ltd [Member]
Maximum [Member]
USD ($)
Feb. 28, 2013
Standard Motor Products Holdings Ltd [Member]
Customer Relationships [Member]
USD ($)
Jun. 30, 2013
Standard Motor Products Holdings Ltd [Member]
Customer Relationships [Member]
USD ($)
Jun. 30, 2013
CompressorWorks, Inc. [Member]
USD ($)
Apr. 30, 2012
CompressorWorks, Inc. [Member]
USD ($)
Apr. 30, 2012
CompressorWorks, Inc. [Member]
Customer Relationships [Member]
USD ($)
Apr. 30, 2012
CompressorWorks, Inc. [Member]
Trademarks And Trade Names [Member]
USD ($)
Apr. 30, 2012
CompressorWorks, Inc. [Member]
Non-compete Agreements [Member]
USD ($)
Apr. 30, 2012
CompressorWorks, Inc. [Member]
Leasehold [Member]
USD ($)
Business Acquisition [Line Items]                                        
Percentage of minority interest acquired (in hundredths)             25.00%                          
Purchase price of business           $ 6,300,000     $ 6,500,000 £ 4,200,000                    
Incremental annual revenue from acquired business                     1,000,000 2,000,000                
Intangible assets acquired in business acquisition                         3,800,000 3,800,000            
Estimated useful life of intangible assets                           10 years     7 years 3 years 3 years 2 years 3 months 18 days
Goodwill acquired in business acquisition               2,000,000                        
Purchase price excluding working capital adjustment                               37,400,000        
Working capital adjustment                               1,200,000        
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                                        
Purchase price                             38,594,000          
Assets acquired and liabilities assumed [Abstract]                                        
Receivables                               9,114,000        
Inventory                               22,736,000        
Other current assets                               60,000        
Property, plant and equipment                               1,427,000        
Intangible assets                               8,870,000 8,000,000 500,000 200,000 200,000
Goodwill 37,836,000   37,836,000   35,827,000                     9,703,000        
Current liabilities                               (13,316,000)        
Net assets acquired                               38,594,000        
Unaudited pro forma financial information [Abstract]                                        
Net sales 270,126,000 268,875,000 500,834,000 480,586,000                                
Net earnings 16,043,000 13,404,000 25,217,000 18,598,000                                
Pro Forma Net sales 270,126,000 276,040,000 501,149,000 501,254,000                                
Pro Forma Net earnings $ 16,074,000 $ 14,517,000 $ 25,365,000 $ 20,281,000