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Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 1.5	$ 1.6
Deferred Finance Costs, Amortization [Abstract]
Remainder of 2024	0.4
2025	0.5
2026	0.5
2027	$ 0.1

X

- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	smp_DebtIssuanceCostsAmortizationAbstract
Namespace Prefix:	smp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

+ Details

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- References

No definition available.

+ Details

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