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Acquired Intangible Assets (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | $ 57,126,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross |  |  | $ 57,299,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross |
Less accumulated amortization | (25,373,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | [1] |  | (24,120,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | [1]
Net acquired intangible assets | 31,753,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |  | 33,179,000 us-gaap_FiniteLivedIntangibleAssetsNet |
Amortization of acquired intangible assets [Abstract] |  |  |  |  |
Amortization expense | 1,300,000 us-gaap_AmortizationOfIntangibleAssets |  | 1,100,000 us-gaap_AmortizationOfIntangibleAssets |  |
Estimated amortization expense, remainder of current year | 3,700,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |  |  |
Estimated amortization expense in year 2016 | 4,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |
Estimated amortization expense in year 2017 | 4,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |
Estimated amortization expense in years 2018 through 2028 | 13,500,000 smp_FiniteLivedIntangibleAssetsAmortizationExpenseRemainingYears |  |  |  |
Customer Relationships [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | 48,473,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  | 48,646,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Trademarks and Trade Names [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | 6,800,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  | 6,800,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Intangible assets acquired [Abstract] |  |  |  |  |
Amount of acquired indefinite-lived intangible assets | 5,200,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |
Non-compete Agreements [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | 970,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  | 970,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Patents and Supply Contracts [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | 723,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = smp_PatentsAndSupplyContractsMember |  |  | 723,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = smp_PatentsAndSupplyContractsMember |
Leaseholds [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Total acquired intangible assets | $ 160,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |  |  | $ 160,000 smp_AcquiredFiniteLivedIntangibleAssetAmountGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
[1] | Applies to all intangible assets, except for 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 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 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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