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Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 191.4	$ 150.2
Charge related to sale of receivables	$ 2.7	$ 2.8

X

- Definition

The amount of receivables sold during the period.

+ References

No definition available.

+ Details

Name:	smp_SaleOfReceivables
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of charges incurred relating to the sale of receivables during the reporting period.

+ References

No definition available.

+ Details

Name:	smp_SaleOfReceivablesRelatedCharges
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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