XML 13 R33.htm IDEA: XBRL DOCUMENT v2.4.0.6

Basis of Presentation (Details)	Jun. 30, 2012
Basis of Presentation [Abstract]
Equity ownership in entities included in consolidated financial statements, minimum (in hundredths)	50.00%

X

- Definition

Minimum equity ownership percentage in the entities included in the consolidated financial statements.

+ References

No definition available.

+ Details

Name:	smp_EquityOwnershipInEntitiesIncludedInConsolidatedFinancialStatementsMinimum
Namespace Prefix:	smp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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