Related Party Arrangements (Details) (USD $)	1 Months Ended	6 Months Ended		12 Months Ended	53 Months Ended	6 Months Ended							3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended					66 Months Ended	6 Months Ended		1 Months Ended
	Aug. 31, 2013 investment	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 PE Investment I	Jun. 30, 2014 Acquisition	Jun. 30, 2014 Disposition	Jun. 30, 2014 Advisor Asset management	Jun. 30, 2014 Dealer Manager Maximum Selling commissions /Dealer manager fees	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC	Dec. 31, 2013 NS Real Estate Income Trust Advisor, LLC	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Asset management	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Asset management	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Asset management	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Asset management	Dec. 31, 2013 NS Real Estate Income Trust Advisor, LLC Asset management	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Acquisition	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Acquisition	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Acquisition	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Acquisition	Dec. 31, 2013 NS Real Estate Income Trust Advisor, LLC Acquisition	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Disposition	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Disposition	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Disposition	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Disposition	Dec. 31, 2013 NS Real Estate Income Trust Advisor, LLC Disposition	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Operating costs	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Operating costs	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Operating costs Q	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Operating costs	Dec. 31, 2013 NS Real Estate Income Trust Advisor, LLC Operating costs	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Offering	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Offering	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Selling commissions /Dealer manager fees	Jun. 30, 2013 NS Real Estate Income Trust Advisor, LLC Selling commissions /Dealer manager fees	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Maximum	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Maximum Disposition	Jun. 30, 2014 NS Real Estate Income Trust Advisor, LLC Maximum Operating costs	Jun. 30, 2014 Sponsor	Jun. 30, 2014 Sponsor	Jun. 30, 2014 Sponsor PE Investment I	Jun. 30, 2014 Sponsor Maximum	Aug. 31, 2013 Securitization 2013-1 investment	Aug. 31, 2013 Senior Loans investment
Related Party Arrangements
Annual Asset Management Fee Rate									1.25%
Asset Management Fee
Monthly asset management fee rate (percent)									0.10417%
Asset Acquisition Fee
Asset acquisition fee as percentage of principal amount funded to originate CRE debt or other real estate investments (percent)																				1.00%
Asset Disposition Fee
Asset disposition fee as percentage of contract sales price of CRE debt, CRE security or select CRE equity investment sold (percent)																									1.00%
Asset disposition fee as a percentage of the principal amount of the CRE debt investment prior to the specified transaction (percent)																																						1.00%
Operating Costs
Number of preceding fiscal quarters considered for reimbursement of operating costs (quarters)																														4
Percentage of average invested assets reimbursable as operating costs (percent)																																							2.00%
Percentage of net income, without reduction for any additions to reserves for depreciation, loan losses or other similar non-cash reserves and excluding any gain from the sale of the Company's assets, considered for reimbursement of operating costs (percent)																																							25.00%
Period for true-up calculation of expense reimbursements																														12 months
Organization and Offering Costs
Percentage of gross offering proceeds from the Primary Offering reimbursable as organization and offering costs (percent)																																					15.00%
Expected reimbursable organization and offering costs, excluding selling commissions and dealer manager fee																																					$ 15,000,000.0
Expected reimbursable organization and offering costs, excluding selling commissions and dealer manager fee, as a percentage of total proceeds available to be raised from the primary offering (percent)																																					1.50%
Gross proceeds from issuance of common stock					1,072,900,000						1,072,900,000
Estimated reimbursable organization and offering costs, excluding selling commissions and dealer manager fee, as a percentage of total proceeds available to be raised from the primary offering (percent)											1.00%
Maximum underwriting compensation including selling commissions, the dealer manager fee and amounts reimbursed (percent)											10.00%
Selling Commissions and Dealer Manager Fees
Selling commissions as a percentage of gross offering proceeds from primary offering (percent)										7.00%
Dealer manager fee as a percentage of gross offering proceeds from primary offering (percent)										3.00%
Amount of transaction with related parties													5,379,000	2,761,000	10,123,000	4,903,000		3,369,000	2,981,000	3,489,000	5,323,000		632,000	15,000	807,000	15,000		3,007,000	2,218,000	5,262,000	3,754,000		1,500,000	2,500,000	32,600,000	49,500,000
Due to related party		0		3,076,000								3,076,000					1,607,000					0					10,000					1,459,000
Fees deferred by advisor							500,000	300,000
Value of shares of common stock committed to be purchased																																											10,000,000.0
Purchase price of common stock (in dollars per share)																																								$ 9.00
Shares purchased during the period (shares)																																									507,980
Value of stock issued during period				460,225,000																																					4,600,000
Securitization 2013-1
Number of CRE debt investments contributed (investments)	4																																											8	3
Aggregate principal amount of CRE debt investment contributed	105,500,000																																											346,100,000
Number of senior loans transferred (investments)	3
Debt instrument debt created from bifurcation																																													79,100,000
PE Investments
Ownership percentage (percent)						29.50%
Aggregate cash contribution to fund						400,100,000
Cash contribution to fund		$ 53,404,000	$ 134,664,000			$ 118,000,000																																				$ 282,100,000
Asset Management Fee Monthly Factor									0.0833333333