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Real Estate (Real Estate Available and Held for Sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 137,274	$ 167,303
Property transferred to held for sale, aggregate, carrying value	8,200
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	137,300	155,800
Commercial Operating Properties
Real Estate Properties [Line Items]
Property transferred from held for sale, aggregate, carrying value	2,900
Condominium Units
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value		56,700
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 0	4,521
Property transferred to held for sale, aggregate, carrying value		$ 4,000

X

- Definition

Property Transferred from HFS, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: