Certain Relationships and Related Party Transactions - Schedule of Fees Earned and Expenses Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Due to related parties	$ 2,004		$ 2,004		$ 4,938
Advisor
Related Party Transaction [Line Items]
Due to related parties	1,926		1,926		4,854
Advisor \| Debt financing fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred		$ 138		$ 230
Advisor \| Organization and offering costs
Related Party Transaction [Line Items]
Due to related parties	1,923		1,923		3,076
Fees earned / expenses incurred		305		629
Advisor \| Operating expense reimbursements
Related Party Transaction [Line Items]
Due to related parties	3		3		1,778
Fees earned / expenses incurred	4	361	10	766
Advisor \| Asset management fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred	566	459	1,121	874
Advisor \| Related Party Acquisition Fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred		846		1,456
Advisor \| Disposition fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred			62
Manager
Related Party Transaction [Line Items]
Due to related parties	78		78		84
Manager \| Operating expense reimbursements
Related Party Transaction [Line Items]
Due to related parties					3
Manager \| Asset management fees
Related Party Transaction [Line Items]
Due to related parties	78		78		$ 81
Fees earned / expenses incurred	227	171	452	330
Manager \| Construction management fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred	$ 35	72	$ 165	114
Manager \| Operating expense reimbursements
Related Party Transaction [Line Items]
Fees earned / expenses incurred		8		38
RAI \| Internal audit fee
Related Party Transaction [Line Items]
Fees earned / expenses incurred		13		25
Resource Securities \| Selling commissions and dealer-manager fees
Related Party Transaction [Line Items]
Fees earned / expenses incurred		278		1,098
Resource Securities \| Distribution and shareholder servicing fee
Related Party Transaction [Line Items]
Fees earned / expenses incurred		71		495
The Planning and Zoning Resource Company
Related Party Transaction [Line Items]
Fees earned / expenses incurred		$ 2		$ 3

Resource Apartment REIT III, Inc. 10-Q