XML 61 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Real Estate (Impairments) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Condominium_Unit | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Condominium_Unit | Jun. 30, 2017 USD ($)
Investment [Line Items] |  |  |  |
Impairment of assets | $ 6,088 | $ 10,284 | $ 10,188 | $ 14,696
Number of units to be sold per contract | Condominium_Unit | 4 |  | 4 |
Held-for-Sale, Impending Contract to Sell Condominiums |  |  |  |
Investment [Line Items] |  |  |  |
Impairment of assets |  |  | $ 8,900 |
Held-for-Sale, Change in Business Strategy |  |  |  |
Investment [Line Items] |  |  |  |
Impairment of assets |  |  |  | $ 4,400

X
- References No definition available. + Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Units To Be Sold Per Contract + References No definition available. + Details
Name: | star_NumberOfUnitsToBeSoldPerContract
Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: 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=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | star_HeldforSaleReclassificationAxis=star_HeldforSaleImpendingContracttoSellCondominiumsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_HeldforSaleReclassificationAxis=star_HeldforSaleChangeinBusinessStrategyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |