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Acquired Intangible Assets (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Apr. 30, 2012
Customer Relationships [Member]
Sep. 30, 2013
Customer Relationships [Member]
Dec. 31, 2012
Customer Relationships [Member]
Feb. 28, 2013
Customer Relationships [Member]
SMP Europe [Member]
Sep. 30, 2013
Customer Relationships [Member]
SMP Europe [Member]
Sep. 30, 2013
Trademarks and Trade Names [Member]
Dec. 31, 2012
Trademarks and Trade Names [Member]
Apr. 30, 2012
Non-compete Agreements [Member]
Sep. 30, 2013
Non-compete Agreements [Member]
Dec. 31, 2012
Non-compete Agreements [Member]
Sep. 30, 2013
Patents and Supply Contracts [Member]
Dec. 31, 2012
Patents and Supply Contracts [Member]
Sep. 30, 2013
Leaseholds [Member]
Dec. 31, 2012
Leaseholds [Member]
Acquired Finite-lived and Indefinite-lived Intangible Assets [Line Items]                                      
Total acquired intangible assets $ 52,682,000   $ 52,682,000   $ 48,693,000   $ 44,089,000 $ 40,100,000     $ 6,800,000 $ 6,800,000   $ 910,000 $ 910,000 $ 723,000 $ 723,000 $ 160,000 $ 160,000
Less accumulated amortization (18,072,000) [1]   (18,072,000) [1]   (14,210,000) [1]                            
Net acquired intangible assets 34,610,000   34,610,000   34,483,000                            
Intangible assets acquired [Abstract]                                      
Amount of acquired indefinite-lived intangible assets                     5,200,000                
Amount of acquired intangible assets                 3,800,000 3,800,000                  
Estimated useful life of intangible assets           7 years     10 years 10 years     3 years            
Amortization of acquired intangible assets [Abstract]                                      
Amortization expense 1,100,000 1,300,000 3,900,000 3,400,000                              
Estimated amortization expense, remainder of current year 1,100,000   1,100,000                                
Estimated amortization expense in year 2014 4,500,000   4,500,000                                
Estimated amortization expense in year 2015 4,300,000   4,300,000                                
Estimated amortization expense in years 2016 through 2028 $ 19,300,000   $ 19,300,000                                
[1] Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.