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Summary of Significant Accounting Policies, Principles of Consolidation (Details)	Dec. 31, 2022
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