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Real Estate (Real Estate Available and Held for Sale) (Details) - Executed Contract with Third Party - Net Lease $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) lease_asset
Real Estate Properties [Line Items]
Net lease asset transferred | lease_asset	1
Property transferred to held for sale, carrying value | $	$ 0.7

X

- Definition

Number of Real Estate Properties Transferred to Held for Sale

+ References

No definition available.

+ Details

Name:	star_NumberofRealEstatePropertiesTransferredtoHeldforSale
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

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

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

X

- Details

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

X

- Details

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