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Commitments and Contingencies (Narrative) (Details) - Land - Real Estate Sales $ in Millions	Jan. 22, 2015 USD ($) a
Other Commitments [Line Items]
Acres of real estate property | a	1,250
Unpaid purchase price | $	$ 114.0
Unpaid purchase price, interest rate	12.00%

X

- Definition

Unpaid Purchase Price

+ References

No definition available.

+ Details

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

X

- Definition

Unpaid Purchase Price, Interest Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
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=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TransactionTypeAxis=star_RealEstateSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: