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Real Estate (Real Estate Available and Held for Sale) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 132,395		$ 137,274
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 717		0
Number of real estate properties sold | property	1
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 131,700		$ 137,300
Executed Contract with Third Party | Net Lease
Real Estate Properties [Line Items]
Property transferred to held for sale, carrying value	$ 700	$ 7,500

X

- Definition

Number of Real Estate Properties Sold

+ References

No definition available.

+ Details

Name:	star_NumberofRealEstatePropertiesSold
Namespace Prefix:	star_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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

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

Name:	star_RealEstateAvailableAndHeldForSale
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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=star_NetLeaseAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=star_ResidentialOperatingPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	star_HeldforSaleReclassificationAxis=star_ExecutedContractwithThirdPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: