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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 139,672,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	[1]	$ 752,425,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	[1]
Unpaid Principal Balance	138,801,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	[1]	747,522,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	[1]
Related Allowance	(64,990,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance	[1]	(348,004,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance	[1]
Loans modified through troubled debt restructurings	10,400,000us-gaap_FinancingReceivableModificationsRecordedInvestment		231,800,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Average Recorded Investment	422,973,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment		943,761,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment		1,350,704,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income Recognized	2,261,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod		17,618,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod		7,102,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod
Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	130,645,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]	653,349,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]
Unpaid Principal Balance	129,744,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]	648,455,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]
Related Allowance	(64,440,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]	(304,544,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember	[1]
Average Recorded Investment	370,010,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		825,656,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		1,226,138,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Interest Income Recognized	2,080,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		11,245,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember		6,630,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember		32,382,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember		52,208,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Interest Income Recognized	0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember		0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember		0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,027,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]	99,076,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]
Unpaid Principal Balance	9,057,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]	99,067,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]
Related Allowance	(550,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]	(43,460,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember	[1]
Average Recorded Investment	52,963,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		85,723,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		72,358,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Interest Income Recognized	181,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		6,373,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember		472,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	35,659,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		39,471,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		172,203,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized	1,922,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		15,319,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		2,925,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With no related allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	0us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]	3,012,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]
Unpaid Principal Balance	0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]	2,992,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]
Related Allowance	0us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]	0us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember	[1]
Average Recorded Investment	35,659,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		31,409,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		162,093,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized	1,922,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		9,269,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		2,765,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With no related allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		8,062,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		10,110,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
Interest Income Recognized	0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		6,050,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember		160,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithoutAllowanceMember
With an allowance recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	139,672,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	749,413,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	138,801,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	744,530,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(64,990,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	(348,004,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	387,314,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		904,290,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		1,178,501,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	339,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		2,299,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		4,177,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Senior mortgages
Financing Receivable, Impaired [Line Items]
Recorded Investment	130,645,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	650,337,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	129,744,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	645,463,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(64,440,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	(304,544,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	334,351,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		794,247,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		1,064,045,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	158,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		1,976,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		3,865,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		32,382,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		52,208,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		0star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
With an allowance recorded | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,027,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	99,076,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Unpaid Principal Balance	9,057,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	99,067,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Related Allowance	(550,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]	(43,460,000)us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember	[1]
Average Recorded Investment	52,963,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		77,661,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		62,248,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Interest Income Recognized	181,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		323,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember		312,000star_ImpairedFinancingReceivablesInterestIncomeCashOrAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / star_ImpairedLoansRelatedAllowanceAxis = star_ReceivablesWithAllowanceMember
Nonperforming Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, interest income, cash basis method	$ 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_NonperformingFinancingReceivableMember		$ 13,300,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_NonperformingFinancingReceivableMember
[1] All of the Company's non-accrual loans are considered impaired and included in the table above. In addition, as of December 31, 2014 and 2013, certain loans modified through troubled debt restructurings with a recorded investment of $10.4 million and $231.8 million, respectively, are also included as impaired loans in accordance with GAAP although they are performing and on accrual status.

X

- Definition

The interest income recognized on a cash-basis or accrual method of accounting during the time within that period that the financing receivables were impaired.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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