Related Party Transactions and Arrangements - Fees Paid in Connection with the Operations of the Company - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Mar. 28, 2016
Related Party Transaction [Line Items]
Amended quarterly asset management fee earned (percent)		0.0625%
Quarterly asset management fee earned (percent)		0.1875%
Share price (in dollars per share)		$ 22.50
Common stock, issued (shares)		36,300,777	10,163,206
Related party payables		$ 6,546,000	$ 7,011,000
Promissory notes payable | Property Improvement Plan Promissory Note
Related Party Transaction [Line Items]
Repayment of affiliate note payable used to fund acquisition deposit	$ 1,800,000
Common Class B
Related Party Transaction [Line Items]
Cumulative capital investment return (percent)		6.00%
Common stock, issued (shares)		524,956
Related party expenses		$ 400,000	100,000
Related party payables		$ 100,000
ARC Realty Finance Advisors, LLC
Related Party Transaction [Line Items]
Real estate acquisition fee		1.50%
Real estate acquisition fee reimbursement maximum (percent)		0.10%
Real estate acquisition fee acquisition cost reimbursement aggregate (percent)		1.90%
Real estate acquisition fee acquisition maximum (percent)		4.50%
Annual asset management fee lower of cost of assets or net asset value (percent)		0.75%
Reimbursement costs for administrative services maximum of operating expenses (percent)		2.00%
Reimbursement costs for administrative services maximum of net income (percent)		25.00%
Advisor
Related Party Transaction [Line Items]
Related party expenses		$ 54,225,000	2,413,000
Related party payables		$ 1,190,000	0
Property Manager
Related Party Transaction [Line Items]
Cumulative capital investment return (percent)		8.50%
Related party expenses		$ 16,714,000	2,841,000
Related party payables		$ 4,659,000	248,000
Property management fee (percent)		4.00%
Annual incentive fee (percent)		15.00%
Property Manager | Incentive Fees
Related Party Transaction [Line Items]
Related party expenses		$ 100,000	100,000
Dealer manager
Related Party Transaction [Line Items]
Related party expenses		460,000	5,730,000
Related party payables		0	4,645,000
Dealer manager | Strategic Advisory Services and Investment Banking Services Contract
Related Party Transaction [Line Items]
Amount of agreement		$ 900,000
Dealer manager | Strategic Financial Advice and Assistance with Grace Acquisition
Related Party Transaction [Line Items]
Related party expenses			$ 4,500,000
Related party rate			0.25%
Affiliated Entity | Transaction Management Services In Connection with Grace Acquisition
Related Party Transaction [Line Items]
Acquisition and transaction related costs			$ 800,000
Subsequent event
Related Party Transaction [Line Items]
Share price (in dollars per share)				$ 23.75
Subsequent event | Advisor
Related Party Transaction [Line Items]
Maximum monthly asset management fee payable				$ 500,000