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Summary of Significant Accounting Policies, Principles of Consolidation (Details) | Dec. 31, 2022
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Principles of Consolidation [Abstract] |
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
Name: | smp_MinimumEquityOwnershipPercentageThresholdForConsolidationInFinancialStatements
Namespace Prefix: | smp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | smp_PrinciplesOfConsolidationAbstract
Namespace Prefix: | smp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration