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Summary of Significant Accounting Policies, Allowance for Expected Credit Losses and Cash Discounts (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Allowance for Expected Credit Losses and Cash Discounts [Abstract]
Number of customers who filed a petition | Customer	1
Customer bankruptcy charge | $	$ 7,002	$ 0	$ 0

X

- References

No definition available.

+ Details

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Namespace Prefix:	smp_
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Balance Type:	na
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X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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X

- Definition

The aggregate number of claims filed with the bankruptcy court.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124433192&loc=d3e56015-112765

+ Details

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