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Subsequent Event (Details) - Subsequent Event [Member] $ in Millions | Oct. 31, 2016 USD ($)
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Subsequent Event [Line Items] |
Restructuring and integration expenses, expected cost of plant | $ 3.3
Minimum [Member] |
Subsequent Event [Line Items] |
Restructuring and integration expenses, period of plant | 12 months
Maximum [Member] |
Subsequent Event [Line Items] |
Restructuring and integration expenses, period of plant | 18 months
Capital Expenditures [Member] |
Subsequent Event [Line Items] |
Restructuring and integration expenses, expected cost of plant | $ 0.5
Employee Severance and Relocation of Certain Machinery and Equipment and Lease Termination Fees [Member] |
Subsequent Event [Line Items] |
Restructuring and integration expenses, expected cost of plant | $ 2.8

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- Definition Refers to period of completion for restructuring and related activities. + References No definition available. + Details
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Namespace Prefix: | smp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=smp_CapitalExpendituresOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |