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Goodwill and Other Intangible Assets (Details) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Customer Relationships [Member] USD ($) | Dec. 31, 2012 Customer Relationships [Member] USD ($) | Dec. 31, 2013 Trademarks and Trade Names [Member] USD ($) | Dec. 31, 2012 Trademarks and Trade Names [Member] USD ($) | Dec. 31, 2013 Non-compete Agreements [Member] USD ($) | Dec. 31, 2012 Non-compete Agreements [Member] USD ($) | Dec. 31, 2013 Patents and Supply Contracts [Member] USD ($) | Dec. 31, 2012 Patents and Supply Contracts [Member] USD ($) | Dec. 31, 2013 Leaseholds [Member] USD ($) | Dec. 31, 2012 Leaseholds [Member] USD ($) | Dec. 31, 2013 Computer Software [Member] USD ($) | Dec. 31, 2012 Computer Software [Member] USD ($) | Dec. 31, 2011 Computer Software [Member] USD ($) | Dec. 31, 2013 Computer Software [Member] Minimum [Member] | Dec. 31, 2013 Computer Software [Member] Maximum [Member] | Dec. 31, 2013 Dana Acquisition [Member] Trademarks and Trade Names [Member] USD ($) | Dec. 31, 2013 CompressorWorks, Inc. [Member] USD ($) | Dec. 31, 2012 CompressorWorks, Inc. [Member] USD ($) | Dec. 31, 2012 CompressorWorks, Inc. [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2012 CompressorWorks, Inc. [Member] Trademarks and Trade Names [Member] USD ($) | Dec. 31, 2012 CompressorWorks, Inc. [Member] Non-compete Agreements [Member] USD ($) | Dec. 31, 2012 CompressorWorks, Inc. [Member] Leaseholds [Member] USD ($) | Feb. 28, 2013 SMP Europe [Member] USD ($) | Feb. 28, 2013 SMP Europe [Member] GBP (£) | Dec. 31, 2013 SMP Europe [Member] USD ($) | Feb. 28, 2013 SMP Europe [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2013 SMP Europe [Member] Customer Relationships [Member] USD ($) | Dec. 31, 2013 Engine Management [Member] USD ($) | Dec. 31, 2011 Engine Management [Member] USD ($) | Dec. 31, 2012 Engine Management [Member] CompressorWorks, Inc. [Member] USD ($) | Dec. 31, 2013 Engine Management [Member] SMP Europe [Member] USD ($) | Dec. 31, 2013 Temperature Control [Member] USD ($) | Dec. 31, 2011 Temperature Control [Member] USD ($) | Dec. 31, 2012 Temperature Control [Member] CompressorWorks, Inc. [Member] USD ($) | Dec. 31, 2013 Temperature Control [Member] SMP Europe [Member] USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of its carrying amount (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  | 60.00% |  |  |
Goodwill by operating segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill gross, Beginning balance | $ 74,315,000 |  | $ 64,612,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,612,000 | $ 64,612,000 |  |  | $ 9,703,000 | $ 0 |  |
Goodwill accumulated impairment loss, Beginning balance | (38,488,000) |  | (38,488,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38,488,000) | (38,488,000) |  |  | 0 | 0 |  |
Goodwill net, Beginning balance | 35,827,000 |  | 26,124,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,124,000 | 26,124,000 |  |  | 9,703,000 | 0 |  |
Goodwill acquired during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,703,000 |  |  |  |  | 2,000,000 |  | 2,027,000 |  |  |  |  | 0 | 2,027,000 |  |  | 9,703,000 | 0
Goodwill foreign currency exchange rate change | 151,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151,000 |  |  |  | 0 |  |  |
Goodwill gross, Ending balance | 76,493,000 |  | 74,315,000 |  | 64,612,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,790,000 | 64,612,000 |  |  | 9,703,000 | 0 |  |
Goodwill accumulated impairment loss, Ending balance | (38,488,000) |  | (38,488,000) |  | (38,488,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38,488,000) | (38,488,000) |  |  | 0 | 0 |  |
Goodwill net, Ending balance | 38,005,000 |  | 35,827,000 |  | 26,124,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,703,000 |  |  |  |  |  |  |  |  |  |  | 28,302,000 | 26,124,000 |  |  | 9,703,000 | 0 |  |
Purchase price paid in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,594,000 | 38,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding working capital adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 | 4,200,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired in business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,703,000 |  |  |  |  | 2,000,000 |  | 2,027,000 |  |  |  |  | 0 | 2,027,000 |  |  | 9,703,000 | 0
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquired intangible assets | 52,772,000 |  | 48,693,000 |  |  | 44,179,000 | 40,100,000 | 6,800,000 | 6,800,000 | 910,000 | 910,000 | 723,000 | 723,000 | 160,000 | 160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less accumulated amortization | (19,202,000) | [1] | (14,210,000) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net acquired intangible assets | 33,570,000 |  | 34,483,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of acquired indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 | 8,000,000 | 500,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired in business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 | 3,800,000 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 10 years |  |  |  | 7 years | 3 years | 3 years | 2 years 3 months 18 days |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |
Amortization of acquired intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense | 5,000,000 |  | 4,700,000 |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in year 2014 | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in year 2015 | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in year 2016 | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense in years 2017 through 2028 | 15,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets | 16,800,000 |  | 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated computer software amortization | 15,500,000 |  | 15,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of computer software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 500,000 | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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