Debt default, maximum period of failure to comply with obligations, covenants or agreements.

No definition available.

Name:	sup_DebtDefaultMaximumPeriodOfFailureToComplyWithObligationsCovenantsOrAgreements
Namespace Prefix:	sup_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument additional borrowing capacity.

+ References

No definition available.

+ Details

Name:	sup_DebtInstrumentAdditionalBorrowingCapacity
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument, additional default interest rate.

+ References

No definition available.

+ Details

Name:	sup_DebtInstrumentAdditionalDefaultInterestRate
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument amortization term.

+ References

No definition available.

+ Details

Name:	sup_DebtInstrumentAmortizationTerm
Namespace Prefix:	sup_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument debt covenants debt default holder percent to declare all notes due minimum.

+ References

No definition available.

+ Details

Name:	sup_DebtInstrumentDebtCovenantsDebtDefaultHolderPercentToDeclareAllNotesDueMinimum
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Decrease in unrestricted cash and cash equivalent covenants.

+ References

No definition available.

+ Details

Name:	sup_DecreaseInUnrestrictedCashAndCashEquivalentCovenants
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Failure to pay material plan withdrawal obligations.

+ References

No definition available.

+ Details

Name:	sup_FailureToPayMaterialPlanWithdrawalObligations
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase in commitment adjustments.

+ References

No definition available.

+ Details

Name:	sup_IncreaseInCommitmentAdjustments
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Increase in unrestricted cash and cash equivalent covenants.

+ References

No definition available.

+ Details

Name:	sup_IncreaseInUnrestrictedCashAndCashEquivalentCovenants
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Liquidity amount.

+ References

No definition available.

+ Details

Name:	sup_LiquidityAmount
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Net leverage ratio.

+ References

No definition available.

+ Details

Name:	sup_NetLeverageRatio
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Obligations under other debt agreements cross-default minimum amount.

+ References

No definition available.

+ Details

Name:	sup_ObligationsUnderOtherDebtAgreementsCrossDefaultMinimumAmount
Namespace Prefix:	sup_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of debt instrument prepayment premiums rate term loan year one.

+ References

No definition available.

+ Details

Name:	sup_PercentageOfDebtInstrumentPrepaymentPremiumsRateTermLoanYearOne
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of debt instrument prepayment premiums rate term loan year three.

+ References

No definition available.

+ Details

Name:	sup_PercentageOfDebtInstrumentPrepaymentPremiumsRateTermLoanYearThree
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of debt instrument prepayment premiums rate term loan year two.

+ References

No definition available.

+ Details

Name:	sup_PercentageOfDebtInstrumentPrepaymentPremiumsRateTermLoanYearTwo
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Secured net leverage ratio.

+ References

No definition available.

+ Details

Name:	sup_SecuredNetLeverageRatio
Namespace Prefix:	sup_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

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

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28567-108399

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to pay off borrowing used to receive debt funding on a regular basis with maturities ranging from 5-10 years.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfMediumTermNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sup_EuropeanOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sup_SeniorNotes600Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sup_SeniorSecuredTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sup_NewYorkFederalReserveBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sup_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sup_EquipmentLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sup_EuriborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail)			3 Months Ended	6 Months Ended
Debt - Additional Information (Detail)	Dec. 15, 2022 USD ($)	Jun. 15, 2017 EUR (€)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 15, 2022 EUR (€)	May 30, 2017 USD ($)
Debt Instrument [Line Items]
Debt default, maximum period of failure to comply with obligations, covenants or agreements				60 days
Debt default, holder percent to declare all notes due, minimum			30.00%	30.00%
Debt issuance costs and expenses			$ 23,549,000	$ 23,549,000	$ 25,425,000
Long-term debt			615,138,000	615,138,000	622,018,000
Term loan facility balance			$ 638,687,000	$ 638,687,000	$ 647,443,000
Long-term debt, term			5 years	5 years
Obligations under other debt agreements cross-default minimum amount				$ 20,000,000.0
Failure to pay material plan withdrawal obligations				20,000,000.0
European Operations [Member]
Debt Instrument [Line Items]
Long-term debt			$ 2,200,000	2,200,000			$ 70,700,000
Senior Notes, 6.00%, due 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €		€ 250,000,000
Debt instrument, interest rate stated, percentage		6.00%
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Prepayment premium during first year	2.00%
Prepayment premium during second year	2.00%
Prepayment premium during third year	1.00%
Debt instrument maturity date description	However, in the event the Company has not repaid, refinanced or otherwise extended the maturity date of the Notes beyond the maturity date of the Term Loan Facility by the date 91 days prior to June 15, 2025, the Term Loan Facility and Revolving Credit Facility would mature 91 days prior to June 15, 2025. Similarly, in the event the Company has not redeemed, refinanced or otherwise extended the unconditional redemption date of the redeemable preferred stock beyond the maturity date of the Term Loan Facility by the date 91 days prior to September 14, 2025, the Term Loan Facility and Revolving Credit Facility would mature 91 days prior to September 14, 2025.
Liquidity amount	$ 37,500,000
Increase in commitment adjustments				$ 50,000,000.0
Senior Secured Term Loan Facility [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Amount of term loan facility	$ 400,000,000.0
Line of credit facility maturity date	Dec. 15, 2028
Principal payment amount	$ 1,000,000.0
Issuance discount	12,000,000.0
Proceeds of borrowings under term loan facility	388,000,000.0
Debt issuance costs	$ 11,100,000
Debt instrument amortization term	6 years
Additional default interest rate				2.00%
Repayments under term loan facility	$ 349,200,000
Amount outstanding			$ 4,800,000	$ 4,800,000
Senior Secured Term Loan Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio				1.00%
Senior Secured Term Loan Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio				3.50%
Senior Secured Term Loan Facility [Member] \| NYFRB [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Senior Secured Term Loan Facility [Member] \| SOFR [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			7.75%
Senior Secured Term Loan Facility [Member] \| SOFR [Member] \| Minimum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%			7.50%
Senior Secured Term Loan Facility [Member] \| SOFR [Member] \| Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				8.00%
Senior Secured Term Loan Facility [Member] \| One Month SOFR [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Senior Secured Term Loan Facility [Member] \| Base Rate [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%		6.75%
Senior Secured Term Loan Facility [Member] \| Base Rate [Member] \| Minimum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				6.50%
Senior Secured Term Loan Facility [Member] \| Base Rate [Member] \| Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				7.00%
Equipment Loan [Member] \| European Operations [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate stated, percentage			2.20%	2.20%
Debt instrument, maturity date				Mar. 31, 2024
Debt Instrument Redemption Period Two [Member] \| Senior Notes, 6.00%, due 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Redemption percentage		100.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount of term loan facility	$ 107,500,000					€ 60,000,000.0
Maximum additional borrowing capacity	$ 50,000,000.0
Additional default interest rate				2.00%
Commitment fees percentage			0.50%
Liquidity amount			$ 37,500,000	$ 37,500,000
Increase in commitment adjustments				50,000,000.0
Increase in unrestricted cash and cash equivalent covenants				50,000,000.0
Decrease in unrestricted cash and cash equivalent covenants				$ 37,500,000
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fees percentage				0.50%
Net leverage ratio	1.00%			1.00%
Secured net leverage ratio				1.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fees percentage				0.625%
Net leverage ratio	2.00%			4.50%
Secured net leverage ratio				3.50%
Revolving Credit Facility [Member] \| NYFRB [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Revolving Credit Facility [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.10%
Revolving Credit Facility [Member] \| SOFR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.50%
Revolving Credit Facility [Member] \| SOFR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				4.50%
Revolving Credit Facility [Member] \| One Month SOFR [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%		2.50%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.50%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.50%
Revolving Credit Facility [Member] \| EURIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.00%		3.50%
Revolving Credit Facility [Member] \| EURIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.50%
Revolving Credit Facility [Member] \| EURIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				4.50%
Revolving Credit Facility [Member] \| Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Amount of term loan facility	$ 60,000,000.0
Line of credit facility maturity date	Dec. 15, 2027
Unamortized debt issuance costs to written off and charged to interest expense	$ 3,700,000
Debt issuance costs and expenses	$ 3,200,000
Debt instrument amortization term	5 years
Outstanding borrowings			$ 0	$ 0
Revolving Credit Facility [Member] \| Senior Secured Term Loan Facility [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Amount of availability			$ 55,200,000	$ 55,200,000