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Credit agreement debt to EBITDA ratio that is required to be maintained step down.

No definition available.

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Represents the fixed charge coverage ratio that is required to be maintained by the entity under the credit agreement.

No definition available.

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Represents the fixed coverage ratio that is required to be maintained by the entity under the credit agreement.

No definition available.

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Represents the period of total debt to EBITDA ratio considered for calculation of interest rate of debt instrument under the credit agreement.

No definition available.

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Represents the total debt to EBITDA ratio that is required to be maintained by the entity under the credit agreement.

No definition available.

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Debt Instrument, Floor Interest Rate

No definition available.

Name:	sp_DebtInstrumentFloorInterestRate
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Represents the redemption price of debt instrument upon their stated maturity.

No definition available.

Name:	sp_DebtInstrumentRedemptionPriceUponStatedMaturity
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Element represents the debt instrument redemption amount.

No definition available.

Name:	sp_DebtInstrumentRedemptionsAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Element represents the debt redemption amount.

No definition available.

Name:	sp_DebtRedemptionAmountOutstanding
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Line of credit facility, decrease in maximum borrowing capacity.

No definition available.

Name:	sp_LineOfCreditFacilityDecreaseInMaximumBorrowingCapacity
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Line Of Credit Facility, Fees And Other Closing Cost

No definition available.

Name:	sp_LineOfCreditFacilityFeesAndOtherClosingCost
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Line Of Credit Facility, Liquidity Test Minimum

No definition available.

Name:	sp_LineOfCreditFacilityLiquidityTestMinimum
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Line Of Credit Facility, Percentage Of Scheduled Quarterly Amortization Of Principal Installments

No definition available.

Name:	sp_LineOfCreditFacilityPercentageOfScheduledQuarterlyAmortizationOfPrincipalInstallments
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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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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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

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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.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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End date of debt instrument redemption period, in CCYY-MM-DD format.

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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

No definition available.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Nominal or face amount used to calculate payment on derivative.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DerivativeTermOfContract
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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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Name:	us-gaap_InterestPaid
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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 effective interest rate at the end of the reporting period.

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Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
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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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Amount of long-term debt and lease obligation, including portion classified as current.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleSubordinatedDebtMember
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Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
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Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Name:	srt_RangeAxis=srt_MaximumMember
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Name:	srt_RangeAxis=srt_MinimumMember
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