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v3.19.3.a.u2

Commitments and Contingencies, Rent (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Rent [Abstract] |  |  |  |
Total rent expense | $ 11,382 | [1] | $ 12,605 | $ 11,954
Expenses related to non lease components | 2,400 |  |  |
Real Estate [Member] |  |  |  |
Rent [Abstract] |  |  |  |
Total rent expense | 7,909 | [1] | 9,272 | 8,983
Other [Member] |  |  |  |
Rent [Abstract] |  |  |  |
Total rent expense | $ 3,473 | [1] | $ 3,333 | $ 2,971
[1] | Includes expenses of approximately $2.4 million related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material.

X
- Definition Amount excludes expenses related to non-lease components such as maintenance, property taxes, etc, and operating lease expense for leases with an initial term of 12 months or less. + References No definition available. + Details
Name: | smp_OperatingLeaseExcludedExpensesOfNonLease
Namespace Prefix: | smp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OperatingLeasesRentExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=smp_OtherLeasedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |