Name:	smp_AmortizationOfFinancingCostsNextTwelveMonths
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Amortization Of Financing Costs Year Five

No definition available.

Name:	smp_AmortizationOfFinancingCostsYearFive
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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for financing costs.

No definition available.

Name:	smp_AmortizationOfFinancingCostsYearFour
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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for financing costs.

No definition available.

Name:	smp_AmortizationOfFinancingCostsYearThree
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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for financing costs.

No definition available.

Name:	smp_AmortizationOfFinancingCostsYearTwo
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Amortization percentage for periodic payments in a debt agreement.

No definition available.

Name:	smp_DebtInstrumentAmortizationPercentageOfPeriodicPayment
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Consolidated Leverage Ratio as defined in the Credit Agreement.

No definition available.

Name:	smp_DebtInstrumentCovenantLeverageRatioMaximum
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'The maximum net debt to EBITDA ratio under debt agreement.

No definition available.

Name:	smp_DebtInstrumentCovenantMaximumDebtToEBITDARatio
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This element represents number of extensions of maturity date permitted under debt agreement.

No definition available.

Name:	smp_DebtInstrumentNumberOfExtensionsOfMaturityDate
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Period for extension of maturity date permitted under debt agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	smp_DebtInstrumentPeriodForExtensionOfMaturityDate
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Line of Credit Facility, Accordion Feature, Increase Limit

No definition available.

Name:	smp_LineOfCreditFacilityAccordionFeatureIncreaseLimit
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Data Type:	xbrli:monetaryItemType
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Period of time at which cancellation of the credit facility before renewal, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	smp_LineOfCreditFacilityCancellationPeriod
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Period of time at which borrowing available under credit facility automatically renew, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	smp_LineOfCreditFacilityRenewalPeriod
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Threshold borrowing capacity limit to Tigger debt terms,

No definition available.

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Threshold percentage of borrowing capacity to trigger different debt terms.

No definition available.

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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Weighted average interest rate of debt outstanding.

No definition available.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Nominal or face amount used to calculate payment on derivative.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Name:	us-gaap_InterestExpenseDebtExcludingAmortization
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Name:	us-gaap_LineOfCredit
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Average amount borrowed under the credit facility during the period.

No definition available.

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_LineOfCreditFacilityLineItems
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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