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v2.4.1.9

Real Estate (Impairments) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Impairment of assets | $ 34,634,000us-gaap_AssetImpairmentCharges | $ 12,589,000us-gaap_AssetImpairmentCharges | $ 13,778,000us-gaap_AssetImpairmentCharges
Impairment of Real Estate | 34,600,000us-gaap_ImpairmentOfRealEstate | 14,400,000us-gaap_ImpairmentOfRealEstate | 35,400,000us-gaap_ImpairmentOfRealEstate
Impairment of long-lived assets to be disposed of or sold |  | 1,800,000star_ImpairmentofLongLivedAssetstobeDisposedoforSold | 22,600,000star_ImpairmentofLongLivedAssetstobeDisposedoforSold
Net Lease |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of long-lived assets to be disposed of or sold | 3,600,000star_ImpairmentofLongLivedAssetstobeDisposedoforSold / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember |  |
Land and Residential Properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of Real Estate | 15,600,000us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = star_LandandResidentialPropertiesMember |  |
Real Estate Properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of Real Estate | $ 15,400,000us-gaap_ImpairmentOfRealEstate / us-gaap_RealEstatePropertiesAxis = star_RealEstatePropertiesMember |  |
Number of Properties Impaired | 2star_NumberofPropertiesImpaired / us-gaap_RealEstatePropertiesAxis = star_RealEstatePropertiesMember |  |

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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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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of Properties Impaired + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |