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Real Estate (Dispositions) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Land development revenue | $ 8,258,000 us-gaap_LandSales | $ 4,143,000 us-gaap_LandSales
Land development cost of sales | 6,891,000 star_CostsofLandSales | 3,654,000 star_CostsofLandSales
Income from sales of real estate | 21,156,000 us-gaap_GainLossOnSaleOfProperties | 16,494,000 us-gaap_GainLossOnSaleOfProperties
Property sold, aggregate, carrying value |  | 6,700,000 star_PropertySoldAggregateCarryingValue
Net Lease |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net proceeds from sales of real estate |  | 7,800,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Impairment of long-lived assets to be disposed of or sold |  | 3,000,000 star_ImpairmentofLongLivedAssetstobeDisposedoforSold / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Net Lease Asset One |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Initial term of ground lease | 99 years |
Lease incentive asset | 38,100,000 us-gaap_OtherFiniteLivedIntangibleAssetsGross / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetOneMember |
Net Lease Asset Two [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from sale of property held-for-sale | 4,900,000 us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetTwoMember |
Income from sales of real estate | 3,500,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetTwoMember |
Condominium Units |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from sale of other real estate | 49,000,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember | 47,700,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember
Income from sales of real estate | 17,600,000 star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember | 16,500,000 star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember
Operating Properties |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net proceeds from sales of real estate | 93,500,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertyMember |
Deferred gain on sale of property | 5,300,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertyMember |
Net Lease Venture | Net Lease |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net proceeds from sales of real estate |  | 93,700,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember
iStar's ownership percentage | 51.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember | 51.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember
Net Lease Venture | Net Lease Asset One |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net proceeds from sales of real estate |  | $ 93,700,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetOneMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember
Master Planned Community [Member] | Residential Real Estate |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of real estate properties sold | 3 star_NumberofRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / star_ResidentialRealEstateTypeofPropertyAxis = star_MasterPlannedCommunityMember | 2 star_NumberofRealEstatePropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / star_ResidentialRealEstateTypeofPropertyAxis = star_MasterPlannedCommunityMember

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- Definition Costs of Land Sales + References No definition available. + Details
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- Definition Impairment of Long-Lived Assets to be Disposed of or Sold + References No definition available. + Details
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- Definition Number of Real Estate Properties Sold + References No definition available. + Details
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- Definition Property Sold, Aggregate, Carrying Value + References No definition available. + Details
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- Definition The gain resulting from the sale or other disposition of residential properties or components of those assets during the period. + References No definition available. + Details
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Revenue from the sale of land in the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets not otherwise specified in the taxonomy having a reasonably expected period of economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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