OPERATING SEGMENT (Details) $ in Thousands	2 Months Ended	3 Months Ended										6 Months Ended	8 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Oct. 31, 2017 segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)	May 01, 2017 USD ($)	May 01, 2016 USD ($)	Apr. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment												2
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	$ 30,287	$ 45,638	$ 45,946	$ 44,185	$ 42,716	$ 41,866	$ 40,978	$ 42,811	$ 39,797	$ 39,195	$ 38,301		$ 121,871	$ 111,249	$ 169,745	$ 160,104	$ 145,500
Net operating income													71,152		96,711	95,778	87,352
Casualty loss													(915)	(600)	(500)	(414)	(238)
Depreciation and amortization													(50,456)		(82,070)	(44,253)	(39,273)
Impairment of real estate investments													(1,221)		(18,065)	(57,028)	(5,543)
General and administrative expenses													(9,812)	(9,041)	(14,203)	(15,871)	(13,498)
Acquisition and investment related costs															(51)	(3,276)	(830)
Interest expense													(21,359)	(22,804)	(34,178)	(34,314)	(28,417)
Loss on extinguishment of debt													(556)	(818)	(940)	(1,651)	(106)
Interest and other income													1,233		1,508	1,146	385
Income (loss) before gain (loss) on sale of real estate and other investments, gain on bargain purchase and income (loss) from discontinued operations													(15,597)	(27,925)	(57,314)	(64,929)	(3,882)
Gain (loss) on sale of real estate and other investments													9,707	17,816	20,120	18,701	9,640
Gain on bargain purchase													0	0	0	0	3,424
Income (loss) from continuing operations													(5,890)	(10,109)	(37,194)	(46,228)	9,182
Income (loss) from discontinued operations													570	150,703	164,823	76,753	67,420
NET INCOME (LOSS)													(5,320)	140,594	127,629	30,525	76,602
Segment Assets [Abstract]
Property owned	1,627,636			1,669,764				1,358,529					1,627,636		1,669,764	1,358,529
Less accumulated depreciation	(353,871)			(311,324)				(255,599)					(353,871)		(311,324)	(255,599)
Total property owned	1,273,765			1,358,440				1,102,930					1,273,765		1,358,440	1,102,930
Assets held for sale and assets of discontinued operations	0			0				283,023					0		0	283,023
Cash and cash equivalents	13,792			11,891				28,819					13,792		11,891	28,819		$ 0	$ 0	$ 0
Restricted cash	5,464			4,225				27,981					5,464		4,225	27,981
Other assets	27,265			30,297				13,306					27,265		30,297	13,306
Unimproved land	5,301			11,476				18,455					5,301		11,476	18,455
Mortgage loans receivable	10,410			10,329				0					10,410		10,329	0
TOTAL ASSETS	1,335,997			1,426,658				1,474,514					1,335,997		1,426,658	1,474,514
Multi-Family Residential | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues													116,138		159,983	142,214	129,049
Net operating income													67,242		89,523	81,319	74,287
Segment Assets [Abstract]
Property owned	1,582,917			1,606,421				1,260,541					1,582,917		1,606,421	1,260,541
Less accumulated depreciation	(340,081)			(294,477)				(232,592)					(340,081)		(294,477)	(232,592)
Total property owned	1,242,836			1,311,944				1,027,949					1,242,836		1,311,944	1,027,949
All Other | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues													5,733		9,762	17,890	16,451
Net operating income													3,910		7,188	14,459	13,065
Segment Assets [Abstract]
Property owned	44,719			63,343				97,988					44,719		63,343	97,988
Less accumulated depreciation	(13,790)			(16,847)				(23,007)					(13,790)		(16,847)	(23,007)
Total property owned	$ 30,929			$ 46,496				$ 74,981					30,929		46,496	74,981
Real Estate
Segment Reporting Information, Profit (Loss) [Abstract]
Cost of revenue													50,719		73,034	64,326	58,148
Cost of revenue													(50,719)		(73,034)	(64,326)	(58,148)
Real Estate | Multi-Family Residential | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Cost of revenue													48,896		70,460	60,895	54,762
Cost of revenue													(48,896)		(70,460)	(60,895)	(54,762)
Real Estate | All Other | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Cost of revenue													1,823		2,574	3,431	3,386
Cost of revenue													(1,823)		(2,574)	(3,431)	(3,386)
Management Service
Segment Reporting Information, Profit (Loss) [Abstract]
Cost of revenue													3,663	3,652	5,526	5,046	3,714
Cost of revenue													$ (3,663)	$ (3,652)	$ (5,526)	$ (5,046)	$ (3,714)