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Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net loss attributable to redeemable noncontrolling interest	$ (1,925,000)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest	$ (3,119,000)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest	$ (812,000)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Payments for repurchase of redeemable noncontrolling interest		8,800,000us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Strategic Venture, Commercial Operating Properties
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		9,400,000us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_StatementEquityComponentsAxis = star_StrategicVentureCommercialOperatingPropertiesMember
Corporate Joint Venture [Member]
Fair Value of assets acquired			$ 27,300,000us-gaap_FairValueOfAssetsAcquired / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember

X

- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

The fair value of assets acquired in noncash investing or financing activities.

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-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

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No definition available.

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