Real Estate Investments - Summary of Major Components of Investments in Multifamily Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Real estate investment, gross	$ 942,755	$ 650,314
Accumulated depreciation and amortization	(39,873)	(21,788)
Total Net Operating Real Estate Investments	902,882	628,526
Multifamily Properties
Real Estate Properties [Line Items]
Real estate investment, gross	942,755	650,314
Accumulated depreciation and amortization	(39,873)	(21,788)
Total Net Operating Real Estate Investments	902,882	628,526
Multifamily Properties \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross	2,573	17,884
Accumulated depreciation and amortization	(1,844)	(12,442)
Total Net Operating Real Estate Investments	729	5,442
Multifamily Properties \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	177,152	129,320
Total Net Operating Real Estate Investments	177,152	129,320
Multifamily Properties \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	729,675	488,260
Accumulated depreciation and amortization	(32,350)	(8,534)
Total Net Operating Real Estate Investments	697,325	479,726
Multifamily Properties \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	5,346	6,530
Total Net Operating Real Estate Investments	5,346	6,530
Multifamily Properties \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	28,009	8,320
Accumulated depreciation and amortization	(5,679)	(812)
Total Net Operating Real Estate Investments	22,330	7,508
Multifamily Properties \| The Miramar Apartments
Real Estate Properties [Line Items]
Real estate investment, gross	10,832	10,659
Multifamily Properties \| The Miramar Apartments \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		290
Multifamily Properties \| The Miramar Apartments \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,580	1,580
Multifamily Properties \| The Miramar Apartments \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	8,601	8,356
Multifamily Properties \| The Miramar Apartments \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	48
Multifamily Properties \| The Miramar Apartments \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	603	433
Multifamily Properties \| Arbors on Forest Ridge
Real Estate Properties [Line Items]
Real estate investment, gross	13,802	13,740
Multifamily Properties \| Arbors on Forest Ridge \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		312
Multifamily Properties \| Arbors on Forest Ridge \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,330	2,330
Multifamily Properties \| Arbors on Forest Ridge \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	10,948	10,832
Multifamily Properties \| Arbors on Forest Ridge \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross		2
Multifamily Properties \| Arbors on Forest Ridge \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	524	264
Multifamily Properties \| Cutter's Point
Real Estate Properties [Line Items]
Real estate investment, gross	16,735	16,655
Multifamily Properties \| Cutter's Point \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		352
Multifamily Properties \| Cutter's Point \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	3,330	3,330
Multifamily Properties \| Cutter's Point \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	12,747	12,612
Multifamily Properties \| Cutter's Point \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	37	28
Multifamily Properties \| Cutter's Point \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	621	333
Multifamily Properties \| Eagle Crest
Real Estate Properties [Line Items]
Real estate investment, gross	28,054	28,158
Multifamily Properties \| Eagle Crest \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		654
Multifamily Properties \| Eagle Crest \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	5,450	5,450
Multifamily Properties \| Eagle Crest \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	21,846	21,455
Multifamily Properties \| Eagle Crest \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	15	125
Multifamily Properties \| Eagle Crest \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	743	474
Multifamily Properties \| Meridian
Real Estate Properties [Line Items]
Real estate investment, gross	13,066	13,065
Multifamily Properties \| Meridian \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		299
Multifamily Properties \| Meridian \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,310	2,310
Multifamily Properties \| Meridian \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	10,325	10,258
Multifamily Properties \| Meridian \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	12
Multifamily Properties \| Meridian \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	419	198
Multifamily Properties \| Silverbrook
Real Estate Properties [Line Items]
Real estate investment, gross	31,362	31,194
Multifamily Properties \| Silverbrook \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		793
Multifamily Properties \| Silverbrook \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	4,860	4,860
Multifamily Properties \| Silverbrook \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	24,909	24,535
Multifamily Properties \| Silverbrook \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	118	92
Multifamily Properties \| Silverbrook \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	1,475	914
Multifamily Properties \| Timberglen
Real Estate Properties [Line Items]
Real estate investment, gross	17,612	17,303
Multifamily Properties \| Timberglen \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		408
Multifamily Properties \| Timberglen \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,510	2,510
Multifamily Properties \| Timberglen \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	14,379	14,071
Multifamily Properties \| Timberglen \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	20
Multifamily Properties \| Timberglen \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	703	314
Multifamily Properties \| Toscana
Real Estate Properties [Line Items]
Real estate investment, gross	9,512	9,174
Multifamily Properties \| Toscana \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		230
Multifamily Properties \| Toscana \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,730	1,730
Multifamily Properties \| Toscana \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	7,256	6,962
Multifamily Properties \| Toscana \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	4	23
Multifamily Properties \| Toscana \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	522	229
Multifamily Properties \| The Grove at Alban
Real Estate Properties [Line Items]
Real estate investment, gross	23,611	23,683
Multifamily Properties \| The Grove at Alban \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		796
Multifamily Properties \| The Grove at Alban \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	3,640	3,640
Multifamily Properties \| The Grove at Alban \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	18,994	18,913
Multifamily Properties \| The Grove at Alban \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	66	105
Multifamily Properties \| The Grove at Alban \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	911	229
Multifamily Properties \| Willowdale Crossing
Real Estate Properties [Line Items]
Real estate investment, gross	41,088	41,768
Multifamily Properties \| Willowdale Crossing \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		1,172
Multifamily Properties \| Willowdale Crossing \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	4,650	4,650
Multifamily Properties \| Willowdale Crossing \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	35,631	35,544
Multifamily Properties \| Willowdale Crossing \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	23	1
Multifamily Properties \| Willowdale Crossing \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	784	401
Multifamily Properties \| Edgewater at Sandy Springs
Real Estate Properties [Line Items]
Real estate investment, gross	60,312	59,582
Multifamily Properties \| Edgewater at Sandy Springs \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		1,930
Multifamily Properties \| Edgewater at Sandy Springs \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	14,290	14,290
Multifamily Properties \| Edgewater at Sandy Springs \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	43,429	41,094
Multifamily Properties \| Edgewater at Sandy Springs \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	199	1,262
Multifamily Properties \| Edgewater at Sandy Springs \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	2,394	1,006
Multifamily Properties \| Beechwood Terrace
Real Estate Properties [Line Items]
Real estate investment, gross	22,364	21,802
Multifamily Properties \| Beechwood Terrace \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		409
Multifamily Properties \| Beechwood Terrace \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,390	1,390
Multifamily Properties \| Beechwood Terrace \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	20,374	19,681
Multifamily Properties \| Beechwood Terrace \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	28	165
Multifamily Properties \| Beechwood Terrace \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	572	157
Multifamily Properties \| Willow Grove
Real Estate Properties [Line Items]
Real estate investment, gross	15,046	14,490
Multifamily Properties \| Willow Grove \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		298
Multifamily Properties \| Willow Grove \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	3,940	3,940
Multifamily Properties \| Willow Grove \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	10,621	9,513
Multifamily Properties \| Willow Grove \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	2	647
Multifamily Properties \| Willow Grove \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	483	92
Multifamily Properties \| Woodbridge
Real Estate Properties [Line Items]
Real estate investment, gross	16,884	16,489
Multifamily Properties \| Woodbridge \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		334
Multifamily Properties \| Woodbridge \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	3,650	3,650
Multifamily Properties \| Woodbridge \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	12,581	12,020
Multifamily Properties \| Woodbridge \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	110	306
Multifamily Properties \| Woodbridge \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	543	179
Multifamily Properties \| Abbington Heights
Real Estate Properties [Line Items]
Real estate investment, gross	18,678	18,315
Multifamily Properties \| Abbington Heights \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		400
Multifamily Properties \| Abbington Heights \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,770	1,770
Multifamily Properties \| Abbington Heights \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	16,184	15,864
Multifamily Properties \| Abbington Heights \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	67	110
Multifamily Properties \| Abbington Heights \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	657	171
Multifamily Properties \| The Summit at Sabal Park
Real Estate Properties [Line Items]
Real estate investment, gross	19,764	19,449
Multifamily Properties \| The Summit at Sabal Park \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		404
Multifamily Properties \| The Summit at Sabal Park \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	5,770	5,770
Multifamily Properties \| The Summit at Sabal Park \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	13,311	12,972
Multifamily Properties \| The Summit at Sabal Park \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	9	82
Multifamily Properties \| The Summit at Sabal Park \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	674	221
Multifamily Properties \| Courtney Cove
Real Estate Properties [Line Items]
Real estate investment, gross	19,428	19,190
Multifamily Properties \| Courtney Cove \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		431
Multifamily Properties \| Courtney Cove \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	5,880	5,880
Multifamily Properties \| Courtney Cove \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	12,850	12,487
Multifamily Properties \| Courtney Cove \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	30	80
Multifamily Properties \| Courtney Cove \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	668	312
Multifamily Properties \| Colonial Forest
Real Estate Properties [Line Items]
Real estate investment, gross	5,904	5,802
Multifamily Properties \| Colonial Forest \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		186
Multifamily Properties \| Colonial Forest \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,090	2,090
Multifamily Properties \| Colonial Forest \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	3,486	3,117
Multifamily Properties \| Colonial Forest \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross		243
Multifamily Properties \| Colonial Forest \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	328	166
Multifamily Properties \| Park at Blanding
Real Estate Properties [Line Items]
Real estate investment, gross	6,943	6,773
Multifamily Properties \| Park at Blanding \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		177
Multifamily Properties \| Park at Blanding \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,610	2,610
Multifamily Properties \| Park at Blanding \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	4,025	3,691
Multifamily Properties \| Park at Blanding \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	4	184
Multifamily Properties \| Park at Blanding \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	304	111
Multifamily Properties \| Park at Regency
Real Estate Properties [Line Items]
Real estate investment, gross	8,777	8,442
Multifamily Properties \| Park at Regency \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		220
Multifamily Properties \| Park at Regency \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,620	2,620
Multifamily Properties \| Park at Regency \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	5,706	5,344
Multifamily Properties \| Park at Regency \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	5	61
Multifamily Properties \| Park at Regency \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	446	197
Multifamily Properties \| Jade Park
Real Estate Properties [Line Items]
Real estate investment, gross	8,264	8,059
Multifamily Properties \| Jade Park \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		200
Multifamily Properties \| Jade Park \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,490	1,490
Multifamily Properties \| Jade Park \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	6,404	6,061
Multifamily Properties \| Jade Park \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	19	219
Multifamily Properties \| Jade Park \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	351	89
Multifamily Properties \| Mandarin Reserve
Real Estate Properties [Line Items]
Real estate investment, gross	27,481	26,992
Multifamily Properties \| Mandarin Reserve \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		701
Multifamily Properties \| Mandarin Reserve \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	5,610	5,610
Multifamily Properties \| Mandarin Reserve \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	20,850	19,680
Multifamily Properties \| Mandarin Reserve \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross		701
Multifamily Properties \| Mandarin Reserve \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	1,021	300
Multifamily Properties \| Radbourne Lake
Real Estate Properties [Line Items]
Real estate investment, gross	24,597	24,425
Multifamily Properties \| Radbourne Lake \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		652
Multifamily Properties \| Radbourne Lake \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	2,440	2,440
Multifamily Properties \| Radbourne Lake \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	21,194	20,830
Multifamily Properties \| Radbourne Lake \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	224	148
Multifamily Properties \| Radbourne Lake \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	739	355
Multifamily Properties \| Timber Creek
Real Estate Properties [Line Items]
Real estate investment, gross	24,939	23,825
Multifamily Properties \| Timber Creek \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		799
Multifamily Properties \| Timber Creek \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	11,260	11,260
Multifamily Properties \| Timber Creek \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	13,101	10,705
Multifamily Properties \| Timber Creek \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	37	948
Multifamily Properties \| Timber Creek \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	541	113
Multifamily Properties \| Belmont at Duck Creek
Real Estate Properties [Line Items]
Real estate investment, gross	19,438	19,243
Multifamily Properties \| Belmont at Duck Creek \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		436
Multifamily Properties \| Belmont at Duck Creek \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,910	1,910
Multifamily Properties \| Belmont at Duck Creek \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	16,948	16,655
Multifamily Properties \| Belmont at Duck Creek \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	47	107
Multifamily Properties \| Belmont at Duck Creek \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	533	135
Multifamily Properties \| The Arbors
Real Estate Properties [Line Items]
Real estate investment, gross	8,525	7,980
Multifamily Properties \| The Arbors \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real estate investment, gross		199
Multifamily Properties \| The Arbors \| Land
Real Estate Properties [Line Items]
Real estate investment, gross	1,730	1,730
Multifamily Properties \| The Arbors \| Buildings and Improvements
Real Estate Properties [Line Items]
Real estate investment, gross	6,512	5,844
Multifamily Properties \| The Arbors \| Construction in Progress
Real Estate Properties [Line Items]
Real estate investment, gross	4	162
Multifamily Properties \| The Arbors \| Furniture, Fixtures, and Equipment
Real Estate Properties [Line Items]
Real estate investment, gross	279	45

Real Estate Investments - Summary of Major Components of Investments in Multifamily Properties (Details) - USD ($)
$ in Thousands

Dec. 31, 2015

Dec. 31, 2014

Real Estate Properties [Line Items]

Real estate investment, gross

$ 942,755

$ 650,314

Accumulated depreciation and amortization

(39,873)

(21,788)

Total Net Operating Real Estate Investments

902,882