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Debt - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
May 10, 2018 | Feb. 12, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Mortgage loan outstanding balance |  |  | $ 357,200,000 |  | $ 297,300,000
Payments on mortgage loans |  |  | $ 1,649,012 | $ 3,566,914 |
7.25% Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on loan |  | 7.25% |  |  |
Borrowed amount |  | $ 25,000,000 |  |  |
Debt instrument maturity date |  |  | Feb. 15, 2021 |  |
Debt instrument callable date |  |  | Feb. 15, 2019 |  |
Notes face value |  | 101.00% |  |  |
Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payments on mortgage loans | $ 4,000,000 |  |  |  |

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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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