Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details)

v2.4.1.9
Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
sqft
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Square Feet 982,000us-gaap_AreaOfRealEstateProperty  
Carrying Value of Investment $ 208.0us-gaap_EquityMethodInvestments $ 140.2us-gaap_EquityMethodInvestments
Carrying Value of Investment (2.2)skt_EquityMethodInvestmentReportedInLiabilities  
Total Joint Venture Debt 268.2skt_JointVentureDebtOutstanding 202.7skt_JointVentureDebtOutstanding
Partnership Interest [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment 208.0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PartnershipInterestMember 		140.2us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_PartnershipInterestMember
Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember 		[1] 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember
Square Feet 398,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember 		[1] 0us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember
Carrying Value of Investment   11.6us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember
Carrying Value of Investment (2.2)skt_EquityMethodInvestmentReportedInLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember 		[1]  
Total Joint Venture Debt 90.0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember 		[1] 0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_CharlotteMember
Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember 		50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember
Square Feet 353,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember 		353,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember
Carrying Value of Investment 1.3us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember 		7.4us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember
Total Joint Venture Debt 65.0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember 		65.0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_GalvestonHoustonMember
National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember 		50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember
Square Feet 339,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember 		336,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember
Carrying Value of Investment 9.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember 		16.7us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember
Total Joint Venture Debt 83.7skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember 		52.4skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_NationalHarborMember
RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember 		50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember
Square Feet 870,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember 		433,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember
Carrying Value of Investment 132.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember 		85.7us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember
Total Joint Venture Debt 15.7skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember 		17.9skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_RiocanCandaMember
Savannah [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_SavannahMember 		[2]  
Square Feet 0us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_SavannahMember 		[2]  
Carrying Value of Investment 46.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_SavannahMember 		[2]  
Westgate [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 58.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember 		58.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember
Square Feet 381,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember 		332,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember
Carrying Value of Investment 14.3us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember 		16.1us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember
Total Joint Venture Debt 54.0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember 		43.1skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WestgateMember
Wisconsin Dells [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember 		50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember
Square Feet 265,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember 		265,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember
Carrying Value of Investment 2.4us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember 		2.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember
Total Joint Venture Debt   24.3skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= skt_WisconsinDellsMember
Other [Member]    
Schedule of Equity Method Investments [Line Items]    
Square Feet 0us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember 		0us-gaap_AreaOfRealEstateProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
Carrying Value of Investment 1.5us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember 		0.2us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
Total Joint Venture Debt $ 0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember 		$ 0skt_JointVentureDebtOutstanding
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_EquityMethodInvesteeMember
[1] The negative carrying value is due to the distributions of proceeds from a mortgage loan, as well as quarterly distributions of excess cash flow, exceeding the original contributions from the partners.
[2] Based on capital contribution and distribution provisions in the joint venture agreement, we expect our economic interest in the venture's cash flow to be greater than the ownership percentage indicated above, which in this case, states our legal interest in this venture. Our economic interest may fluctuate based on a number of factors, including mortgage financing, partnership capital contributions and distributions, and proceeds from gains or losses of asset sales.