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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 |  |  |  |  |  |
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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.

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- Definition Gross aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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- Definition Aggregate amount of amortization expense expected to be recognized following the latest fiscal year and the amount represents a future range of certain years for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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