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Commitments and Contingencies (Narrative) (Details) (Land, Real Estate Sales [Member], USD $) In Millions, unless otherwise specified	Jan. 22, 2015 acre
Land | Real Estate Sales [Member]
Other Commitments [Line Items]
Area of real estate property	1,250us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Unpaid purchase price	$ 114.0star_UnpaidPurchasePrice / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Unpaid purchase price, interest rate	12.00%star_UnpaidPurchasePriceInterestRate / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Noncontrolling Interest, ownership percentage by noncontrolling owners	15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember

X

- Definition

Unpaid Purchase Price

+ References

No definition available.

+ Details

Name:	star_UnpaidPurchasePrice
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

Name:	star_UnpaidPurchasePriceInterestRate
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

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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