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Summary of Significant Accounting Policies, Concentrations of Credit Risk and Foreign Cash Balances (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($)
Foreign Cash Balances [Abstract]
Foreign cash balance | $	$ 16.8	$ 16.4
Customer Concentration Risk [Member]
Concentration Risk [Abstract]
Number of largest individual customers | Customer	3

X

- Definition

Cash balances held in foreign currencies.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Represents the number of largest individual customers, including members of a marketing group.

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No definition available.

+ Details

Name:	smp_NumberOfLargestIndividualCustomers
Namespace Prefix:	smp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: