INVESTMENT IN UNCONSOLIDATED VENTURES - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Rental and other revenue from real estate properties	$ 6,765	$ 6,261	$ 7,097	$ 6,886	$ 6,211	$ 6,127	$ 5,205	$ 5,087	$ 13,983	$ 10,292	$ 20,244	$ 16,419	$ 27,009	$ 22,630	[1]
Total revenues	6,922	6,422	7,287	7,130	6,434	6,325	5,408	5,262	14,417	10,670	20,839	16,995	27,761	23,429	[1]
Expenses:
Real estate operating expenses	3,090	2,741	3,325	3,176	2,966	2,952	2,393	2,384	6,501	4,777	9,242	7,729	12,332	10,695	[1]
Interest expense	1,931	1,870	2,049	1,946	1,747	1,779	1,471	1,442	3,995	2,913	5,865	4,692	7,796	6,439	[1]
Depreciation	1,568	1,373	1,428	1,547	1,408	1,369	1,076	1,074	2,975	2,150	4,348	3,519	5,916	4,927	[1]
Total expenses	9,225	8,414	9,283	9,213	8,597	8,102	7,392	7,353	18,496	14,745	26,910	22,847	36,135	31,444	[1]
Total revenues less total expenses	(2,303)	(1,992)	(1,996)	(2,083)	(2,163)	(1,777)	(1,984)	(2,091)	(4,079)	(4,075)	(6,071)	(5,852)	(8,374)	(8,015)	[1]
Gain on sale of real estate	680	9,938	0	0	0	424	0	437		437	9,938	861	10,618	861	[1]
Loss on extinguishment of debt	0	(1,387)	0	0	0	0	0	0		0	(1,387)	0	(1,387)	0	[1]
Gain on insurance recovery			0		0	0	0	0	0	0	0	0		0
Net income attributable to common stockholders	$ 6,148	$ 3,272	$ (4,317)	$ (4,247)	$ 8,073	$ (3,111)	$ (4,689)	$ 25,222	$ (8,564)	$ 20,533	$ (5,292)	$ 17,422	856	25,495	[1]
Unconsolidated joint ventures
Revenues:
Rental and other revenue from real estate properties													118,177	109,433
Total revenues													118,177	109,433
Expenses:
Real estate operating expenses													56,684	53,156
Interest expense													35,023	32,003
Depreciation													39,218	39,316
Total expenses													130,925	124,475
Total revenues less total expenses													(12,748)	(15,042)
Gain on sale of real estate													16,899	71,132
Loss on extinguishment of debt													(2,018)	(800)
Gain on insurance recovery													787	6,085
Net income attributable to common stockholders													2,920	61,375
BRT equity in earnings from joint ventures													$ 1,106	$ 32,781

[1] * Amounts restated See footnotes 2 and 16 for more information.