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Basis of Presentation (Details) | 3 Months Ended
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Mar. 31, 2024 Segment
Basis of Presentation [Abstract] |
Number of reportable segments | 2
Equity ownership in entities included in consolidated financial statements, minimum | 50.00%

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- Definition The minimum threshold percentage of equity ownership for domestic and international companies accounted for as a consolidated basis and included on the financial statements. + References No definition available. + Details
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Namespace Prefix: | smp_
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Balance Type: | na
Period Type: | instant

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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