Additional collateral for debt

No definition available.

Name:	sun_DebtInstrumentAdditionalCollateralForDebt
Namespace Prefix:	sun_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum the facility can be increased, subject to certain conditions.

+ References

No definition available.

+ Details

Name:	sun_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	sun_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The adjusted maximum leverage ratio in the event of an acquisition period.

+ References

No definition available.

+ Details

Name:	sun_LineOfCreditFacilityCovenantAdjustedLeverageRatioDuringAcquisition
Namespace Prefix:	sun_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility covenant consolidated leverage ratio.

+ References

No definition available.

+ Details

Name:	sun_LineOfCreditFacilityCovenantConsolidatedLeverageRatio
Namespace Prefix:	sun_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum amount of a purchase price during an acquisition period that can upwardly adjust the required maximum Leverage Ratio

+ References

No definition available.

+ Details

Name:	sun_MinimumPurchasePriceThresholdForLeverageRatioAdjustment
Namespace Prefix:	sun_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of dealer operated sites.

+ References

No definition available.

+ Details

Name:	sun_NumberOfDealerOperatedSites
Namespace Prefix:	sun_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- 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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- 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

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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

+ Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_ExternalCreditRatingByGroupingAxis=us-gaap_ExternalCreditRatingInvestmentGradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sun_TwoThousandTwelveRevolverMember
Namespace Prefix:
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Long-Term Debt (Revolving Credit Agreement) (Details)		9 Months Ended
Long-Term Debt (Revolving Credit Agreement) (Details)	Sep. 25, 2014 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 02, 2015	Apr. 10, 2015 USD ($)	Apr. 04, 2013 dealer
Debt Instrument [Line Items]
Revolving line of credit		$ 958,236,000	$ 450,000,000
Number Of Dealer Operated Sites \| dealer						50
Minimum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Minimum [Member] \| Applicable Margin on Base Rate Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Maximum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
Maximum [Member] \| Applicable Margin on Base Rate Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
2014 Revolver [Member]
Debt Instrument [Line Items]
Revolving line of credit		$ 958,236,000	$ 450,000,000
Revolving Credit Agreement [Member] \| 2014 Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,250,000,000.00				$ 1,500,000,000.0
Line of Credit Facility, Additional Borrowing Capacity	$ 250,000,000				$ 250,000,000
Consolidated total leverage ratio	550.00%
Line of Credit Facility, Covenant, Adjusted Leverage Ratio During Acquisition Period	600.00%			625.00%
Minimum Purchase Price Threshold For Leverage Ratio Adjustment	$ 50,000,000
Debt Instrument, Additional Collateral For Debt	66.00%
Revolving line of credit		958,200,000
Letters of Credit Outstanding, Amount		23,600,000
Current borrowing capacity		$ 518,200,000
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Incremental Addition to One Month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Incremental Addition to Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.25%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Minimum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Minimum [Member] \| Applicable Margin on Base Rate Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.35%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Maximum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| Maximum [Member] \| Applicable Margin on Base Rate Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| External Credit Rating, Investment Grade [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.125%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| External Credit Rating, Investment Grade [Member] \| Minimum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| External Credit Rating, Investment Grade [Member] \| Minimum [Member] \| Applicable Margin on Base Rate Loan [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.125%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| External Credit Rating, Investment Grade [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Commitment fee percentage	0.275%
Revolving Credit Agreement [Member] \| 2014 Revolver [Member] \| External Credit Rating, Investment Grade [Member] \| Maximum [Member] \| Applicable Margin on LIBOR Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Revolving Credit Agreement [Member] \| Predecessor [Member] \| 2012 Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000,000