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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 317,964,000	$ 360,517,000
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	189,600,000	221,000,000
Land
Real Estate Properties [Line Items]
Real estate available and held for sale	121,367,000	132,189,000
Property transferred from HFS, aggregate, carrying value	6,500,000
Condominium Units
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value	$ 56,700,000

X

- Definition

Property Transferred from HFS, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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X

- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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