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Commitments and Contingencies, Rent (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Rent [Abstract] |  |  |  |  |
Total rent expense | $ 12,065 | [1] | $ 11,669 | [1] | $ 11,382
Expenses related to non lease components | 2,000 |  | 2,500 |  |
Real Estate [Member] |  |  |  |  |
Rent [Abstract] |  |  |  |  |
Total rent expense | 9,500 | [1] | 8,290 | [1] | 7,909
Other [Member] |  |  |  |  |
Rent [Abstract] |  |  |  |  |
Total rent expense | $ 2,565 | [1] | $ 3,379 | [1] | $ 3,473
[1] | Includes expenses of approximately $2 million and $2.5 million for the years ended December 31, 2021 and 2020, respectively, 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.

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- Definition Amount of non-lease expense 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
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Namespace Prefix: | smp_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |