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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (1,401)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (1,220)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net 65,704us-gaap_ReceivablesNetCurrent 64,082us-gaap_ReceivablesNetCurrent
Receivables from affiliates 33,511us-gaap_DueFromRelatedPartiesCurrent 36,716us-gaap_DueFromRelatedPartiesCurrent
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 56,987us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
56,006us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Credit Card Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 3,814us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CreditCardReceivablesMember
3,681us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CreditCardReceivablesMember
Vendor receivables for rebates, branding and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 3,157us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sun_VendorreceivablesforrebatesbrandingandotherMember
2,820us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sun_VendorreceivablesforrebatesbrandingandotherMember
Other Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 3,147us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sun_OtherReceivablesMember
2,795us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sun_OtherReceivablesMember
Affiliated Entity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables from affiliates $ 28,500us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
$ 32,700us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember