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Equity (High Performance Unit Program) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 plan
High Performance Unit Program
Stock Performance Award Program [Line Items]
Stock performance award initial purchase price of participant interest	$ 9.8star_StockPerformanceAwardInitialPurchasePriceOfParticipantInterest / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgramMember
Stock performance award, number of plans, not meet performance thresholds	4star_StockPerformanceAwardNumberOfPlansWhichDidNotMeetPerformanceThresholds / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgramMember
HPU
Stock Performance Award Program [Line Items]
Stock performance award, number of voting rights per share	0.25star_StockPerformanceAwardNumberofVotingRightsPerShare / us-gaap_StatementEquityComponentsAxis = star_HpuMember
Employee Stock Performance Award Participant | High Performance Unit Program
Stock Performance Award Program [Line Items]
Stock performance award, number of plans, exceeded performance thresholds	3star_StockPerformanceAwardNumberOfPlansWhichExceededPerformanceThresholds / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgramMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Employee Stock Performance Award Participant | HPU | High Performance Unit Program 2002 Plan [Member]
Stock Performance Award Program [Line Items]
Stock performance award common stock shares basis for distribution calculation	819,254star_StockPerformanceAwardCommonStockSharesBasisForDistributionCalculation / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2002PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Stock performance award, shares outstanding, number	5,000star_StockPerformanceAwardSharesOutstandingNumber / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2002PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Employee Stock Performance Award Participant | HPU | High Performance Unit Program 2003 Plan
Stock Performance Award Program [Line Items]
Stock performance award common stock shares basis for distribution calculation	987,149star_StockPerformanceAwardCommonStockSharesBasisForDistributionCalculation / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2003PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Stock performance award, shares outstanding, number	5,000star_StockPerformanceAwardSharesOutstandingNumber / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2003PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Employee Stock Performance Award Participant | HPU | High Performance Unit Program 2004 Plan
Stock Performance Award Program [Line Items]
Stock performance award common stock shares basis for distribution calculation	1,031,875star_StockPerformanceAwardCommonStockSharesBasisForDistributionCalculation / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2004PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember
Stock performance award, shares outstanding, number	5,000star_StockPerformanceAwardSharesOutstandingNumber / us-gaap_StatementEquityComponentsAxis = star_HpuMember / star_StockPerformanceAwardProgramAxis = star_HighPerformanceUnitProgram2004PlanMember / star_StockPerformanceAwardProgramByParticipantAxis = star_EmployeeStockPerformanceAwardParticipantMember

X

- Definition

Represents the number of shares of the entity's common stock which are used as the basis for determining the amount of distributions to be paid to the holders of the stock performance awards.

+ References

No definition available.

+ Details

Name:	star_StockPerformanceAwardCommonStockSharesBasisForDistributionCalculation
Namespace Prefix:	star_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the initial purchase price HPU holders acquired their interests in High Performance Common Stock.

+ References

No definition available.

+ Details

Name:	star_StockPerformanceAwardInitialPurchasePriceOfParticipantInterest
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the number of High Performance programs which did not meet performance thresholds and were not funded.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of High Performance programs which have exceed the performance thresholds and are funded.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of votes per stock performance award.

+ References

No definition available.

+ Details

Name:	star_StockPerformanceAwardNumberofVotingRightsPerShare
Namespace Prefix:	star_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	star_StockPerformanceAwardProgramLineItems
Namespace Prefix:	star_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of High Performance Common Stock shares outstanding in the plan.

+ References

No definition available.

+ Details

Name:	star_StockPerformanceAwardSharesOutstandingNumber
Namespace Prefix:	star_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	star_StockPerformanceAwardProgramAxis=star_HighPerformanceUnitProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	star_StockPerformanceAwardProgramByParticipantAxis=star_EmployeeStockPerformanceAwardParticipantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=star_HpuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: