2.4.0.8024 - Disclosure - Real Estate Debt Investments (Details)truefalsefalse1false USDfalsefalseContext_6ME__30-Jun-2013http://www.sec.gov/CIK0001503707duration2013-01-01T00:00:002013-06-30T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$1true 3us-gaap_MortgageLoansOnRealEstateLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Mortgage Loans on Real Estate [Line Items]2false 4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse25000002500000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c -Article 7 false2Carrying Amount3false 4nshi_InvestmentFaceAmountnshi_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1125000011250000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAdditional participation interest in loan investment.No definition available.false2Investment face amount4false 4us-gaap_LoansReceivableDescriptionOfVariableRateBasisus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00LIBORfalsefalsefalsexbrli:stringItemTypestringThe reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.No definition available.false0Description of variable rate basis5false 4nshi_MortgageLoansOnRealEstateVariableRateBasisFloornshi_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.01000.0100falsefalsefalsenum:percentItemTypepureRepresents the floor for the variable rate base of the mortgage loans on real estate.No definition available.false0LIBOR floor6false 4us-gaap_MortgageLoansOnRealEstateInterestRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.08000.0800falsefalsefalsenum:percentItemTypepureThe stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 false0Coupon7false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalseContext_6ME__30-Jun-2013_InvestmentTypeAxis_FirstMortgageMemberhttp://www.sec.gov/CIK0001503707duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseFirst mortgage loanus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FirstMortgageMemberus-gaap_InvestmentTypeAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0InvestmentStandardhttp://www.northstarreit.com/20130630Investmentnshi0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0First mortgage loan8true 3us-gaap_MortgageLoansOnRealEstateLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Mortgage Loans on Real Estate [Line Items]9false 4us-gaap_MortgageLoansOnRealEstateNumberOfLoansus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse11falsefalsefalsexbrli:integerItemTypeintegerIndicates the number of mortgages under each classification.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 false256Number10false 4nshi_MortgageLoansOnRealEstateMaturitiesnshi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse002016-03falsefalsefalsexbrli:gYearMonthItemTypeyearmonthThe maturity date of the investment.No definition available.false0Maturity Date11false 4nshi_MortgageLoansOnRealEstateExtendedMaturitiesnshi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse002018-03falsefalsefalsexbrli:gYearMonthItemTypeyearmonthThe extended maturity date of the investment.No definition available.false0Extended Maturity Date12false 4us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgagesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse25000002500000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of the contractual principal due at the origination of the mortgage loan (face amount).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 false2Principal Amount13false 4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse25000002500000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c -Article 7 false2Carrying Amount14false 4us-gaap_LoansReceivableBasisSpreadOnVariableRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.070.07falsefalsefalsenum:percentItemTypepureThe percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.No definition available.false0Spread over LIBOR15false 4nshi_MortgageLoansOnRealEstateCurrentYieldPercentagenshi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse0.08080.0808falsefalsefalsenum:percentItemTypepureRepresents the percentage of current yield on real estate mortgage loans.No definition available.false0Unleveraged Current YieldfalseReal Estate Debt Investments (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.northstarreit.com/role/RealEstateDebtInvestmentsDetails115