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Consolidated Statements of Changes in Equity (Parenthetical) (USD $) | 12 Months Ended
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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

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- 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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Period Type: | instant

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- Definition The fair value of assets acquired in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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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 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
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- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + References No definition available. + Details
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- Details
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- Details
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