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Average Percentage of Real Estate Portfolio Occupied

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Equity Method Investment, Number of Properties Contributed

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Equity Method Investment, Ownership Percent Divested

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Number of Major Customers

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Number of Units in Real Estate Property, Leased, Percent

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Operating Leases, Income Statement, Rental Income, Percentage

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Net rentable area for properties owned.

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No definition available.

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The number of real estate properties owned as of the balance sheet date.

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No definition available.

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The number of units in a real estate property owned as of the balance sheet date.

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No definition available.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

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Real Estate - Narrative (Details)															12 Months Ended			17 Months Ended	37 Months Ended
Real Estate - Narrative (Details)	Dec. 21, 2018 USD ($)	Dec. 12, 2018 USD ($)	Nov. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jan. 31, 2018 USD ($) apartment_community	Jan. 05, 2018 USD ($)	Nov. 15, 2017 USD ($) apartment_community	Nov. 10, 2017 apartment_community	Mar. 14, 2014 USD ($) apartment	Dec. 19, 2013 USD ($) apartment	Nov. 20, 2013 USD ($) apartment	Sep. 30, 2013 USD ($) apartment	Jun. 18, 2013 USD ($) apartment	Nov. 30, 2012 USD ($) apartment	Dec. 31, 2018 USD ($) ft² apartment property customer	Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($)	Jul. 03, 2013 USD ($)	May 16, 2014 USD ($)
Real Estate Properties [Line Items]
Payments to acquire real estate															$ 9,564,647	$ 16,401,961	$ 28,268,601
Number of multifamily real estate properties owned \| property															2
Number of units in real estate property (in number of units or apartments) \| apartment															744
Purchase price															$ 1,017,661,219
Average percentage of real estate portfolio occupied															94.30%	93.80%
Average monthly collected rent															$ 1,068	$ 1,037
Depreciation and amortization															$ 46,109,794	$ 67,755,152	69,513,484
Customer Concentration Risk [Member] \| Tenant [Member]
Real Estate Properties [Line Items]
Number of tenant representing over 10% of Company's annualized base rent \| customer															0	0
Accounts Payable and Accrued Liabilities [Member]
Real Estate Properties [Line Items]
Security deposit liability															$ 2,868,600	$ 3,339,602
Maximum [Member]
Real Estate Properties [Line Items]
Operating lease term															1 year
Residential Real Estate [Member]
Real Estate Properties [Line Items]
Number of multifamily real estate properties owned \| property															35
Number of units in real estate property (in number of units or apartments) \| apartment															9,442
Percentage of units leased															95.50%
Operating leases, revenue, percentage															99.00%	99.00%
Residential Real Estate [Member] \| Maximum [Member]
Real Estate Properties [Line Items]
Operating lease term															12 months
Commercial Real Estate [Member]
Real Estate Properties [Line Items]
Number of multifamily real estate properties owned \| property															2
Net rentable area (in square feet) \| ft²															21,130
Operating leases, revenue, percentage															1.00%	1.00%
Commercial Real Estate [Member] \| Minimum [Member]
Real Estate Properties [Line Items]
Operating lease term															4 months 29 days
Commercial Real Estate [Member] \| Maximum [Member]
Real Estate Properties [Line Items]
Operating lease term															6 years 3 months
Building and Improvements [Member]
Real Estate Properties [Line Items]
Depreciation															$ 44,189,723	$ 67,601,984	69,360,316
Tenant Origination and Absorption Cost [Member]
Real Estate Properties [Line Items]
Amortization															$ 1,766,904
Weighted-average amortization period															1 year
Real Estate Investment [Member]
Real Estate Properties [Line Items]
Amortization																0
Other Intangible Assets [Member]
Real Estate Properties [Line Items]
Amortization															$ 153,167	153,168	153,168
Weighted-average amortization period															18 years 2 months 1 day
Joint Venture Arrangement with Blackstone Real Estate Income Trust, Inc. [Member]
Real Estate Properties [Line Items]
Gain on sale							$ 38,523,427
SIR Land Holdings, LLC [Member] \| Joint Venture Arrangement with Blackstone Real Estate Income Trust, Inc. [Member]
Real Estate Properties [Line Items]
Number of properties contributed \| apartment_community					8		12	20
Ownership percentage								10.00%
BREIT LP [Member] \| Joint Venture Arrangement with Blackstone Real Estate Income Trust, Inc. [Member]
Real Estate Properties [Line Items]
Ownership percentage								90.00%
First Closing Properties [Member] \| Joint Venture Arrangement with Blackstone Real Estate Income Trust, Inc. [Member]
Real Estate Properties [Line Items]
Payments to acquire real estate																			$ 318,576,792
Proceeds from sale							$ 335,430,000
Gain on sale							76,135,530
Second Closing Properties [Member] \| Joint Venture Arrangement with Blackstone Real Estate Income Trust, Inc. [Member]
Real Estate Properties [Line Items]
Payments to acquire real estate																		$ 117,240,032
Ownership percent sold					90.00%
Proceeds from sale							$ 125,370,000
Discontinued Operations, Disposed of by Sale [Member]
Real Estate Properties [Line Items]
Depreciation and amortization															$ 4,391,426	$ 30,106,602	$ 32,827,001
Discontinued Operations, Disposed of by Sale [Member] \| The Moorings Property [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment														216
Payments to Acquire Businesses, Gross														$ 20,250,000
Consideration						$ 28,100,000
Gross profit (loss)						$ 9,658,823
Discontinued Operations, Disposed of by Sale [Member] \| Arrowhead Property [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment														200
Payments to Acquire Businesses, Gross														$ 16,750,000
Consideration					$ 23,600,000
Gross profit (loss)					$ 8,928,691
Discontinued Operations, Disposed of by Sale [Member] \| Willow Crossing [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment											579
Payments to Acquire Businesses, Gross											$ 58,000,000
Consideration				$ 79,000,000
Gross profit (loss)				$ 24,136,113
Discontinued Operations, Disposed of by Sale [Member] \| Mapleshade Park [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment									148
Payments to Acquire Businesses, Gross									$ 23,325,000
Consideration			$ 30,750,000
Gross profit (loss)			$ 9,628,549
Discontinued Operations, Disposed of by Sale [Member] \| Echo at Katy Ranch [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment										260
Payments to Acquire Businesses, Gross										$ 35,100,000
Consideration		$ 35,100,000
Gross profit (loss)		$ 5,072,584
Discontinued Operations, Disposed of by Sale [Member] \| Heights at 2121 [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment												504
Payments to Acquire Businesses, Gross												$ 37,000,000
Consideration	$ 47,000,000
Gross profit (loss)	14,394,129
Discontinued Operations, Disposed of by Sale [Member] \| The Lodge at Trails Edge [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in number of units or apartments) \| apartment													268
Payments to Acquire Businesses, Gross													$ 18,400,000
Consideration	24,000,000
Gross profit (loss)	$ 7,873,302