Commercial Loan Investments - Summary of Commercial Loan Investment Portfolio (Detail) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Original Face Amount	$ 38,460,467	$ 38,460,467
Current Face Amount	38,460,467	38,460,467
Carrying Value	$ 38,343,673	$ 38,331,956
Mezzanine [Member] \| Hotel [Member] \| Atlanta, GA [Member]
Accounts Notes And Loans Receivable [Line Items]
Date of Investment	2014-01	2014-01
Maturity Date	2019-02	2019-02
Original Face Amount	$ 5,000,000	$ 5,000,000
Current Face Amount	5,000,000	5,000,000
Carrying Value	$ 5,000,000	$ 5,000,000
Loans receivable, fixed rate	12.00%	12.00%
Mezzanine [Member] \| Hotel [Member] \| Dallas, TX [Member]
Accounts Notes And Loans Receivable [Line Items]
Date of Investment	2014-09	2014-09
Maturity Date	2016-09	2016-09
Original Face Amount	$ 10,000,000	$ 10,000,000
Current Face Amount	10,000,000	10,000,000
Carrying Value	$ 10,000,000	$ 10,000,000
Loans receivable basis spread on variable rate	7.25%	7.25%
Coupon Rate	30-day LIBOR plus 7.25%
Notes Receivable [Member] \| Retail Shopping Center [Member] \| Sarasota, FL [Member]
Accounts Notes And Loans Receivable [Line Items]
Date of Investment	2014-05	2014-05
Maturity Date	2016-06	2016-06
Original Face Amount	$ 8,960,467	$ 8,960,467
Current Face Amount	8,960,467	8,960,467
Carrying Value	$ 8,960,467	$ 8,960,467
Loans receivable basis spread on variable rate	7.50%	7.50%
Coupon Rate	30-day LIBOR plus 7.50%
First Mortgage [Member] \| Hotel [Member] \| San Juan, Puerto Rico [Member]
Accounts Notes And Loans Receivable [Line Items]
Date of Investment	2015-09	2015-09
Maturity Date	2018-09	2018-09
Original Face Amount	$ 14,500,000	$ 14,500,000
Current Face Amount	14,500,000	14,500,000
Carrying Value	$ 14,383,206	$ 14,371,489
Loans receivable basis spread on variable rate	9.00%	9.00%
Coupon Rate	30-day LIBOR plus 9.00%

Percentage for the amount of loan with fixed rate of interest.

No definition available.

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- Definition

Mortgage and other loans maturity date.

+ References

No definition available.

+ Details

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- Definition

Mortgage and other loans origination date.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a),(b))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

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Period Type:	instant

- Definition

Reflects the aggregate gross carrying amount of all commercial loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on commercial loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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Period Type:	instant

- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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