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v3.23.1

Fair Value Measurements (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) Party | Dec. 31, 2022 USD ($)
Fair Value, Net Asset (Liability) [Abstract] |  |
Number of independent third parties | Party | 2 |
Fair Value [Member] | LEVEL 1 [Member] |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Cash and cash equivalents | $ 24,196 | $ 21,150
Deferred compensation | 22,410 | 20,190
Short term borrowings | 57,614 | 55,031
Long-term debt | 215,487 | 184,589
Fair Value [Member] | LEVEL 2 [Member] |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Cash flow interest rate swap | 3,311 | 5,174
Carrying Amount [Member] | LEVEL 1 [Member] |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Cash and cash equivalents | 24,196 | 21,150
Deferred compensation | 22,410 | 20,190
Short term borrowings | 57,614 | 55,031
Long-term debt | 215,487 | 184,589
Carrying Amount [Member] | LEVEL 2 [Member] |  |
Fair Value, Net Asset (Liability) [Abstract] |  |
Cash flow interest rate swap | $ 3,311 | $ 5,174

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- Definition Fair value portion of currency related to deferred compensation. + References No definition available. + Details
Name: | smp_DeferredCompensationFairValue
Namespace Prefix: | smp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of independent third parties from whom cash flow interest rate swap agreement obtained. + References No definition available. + Details
Name: | smp_NumberOfIndependentThirdParties
Namespace Prefix: | smp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateCashFlowHedgeAssetAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_ShorttermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |