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Derivatives and Fair Value Disclosures - Schedule of Fair Value, Assets and Liabilities Measured on Non-Recurring Basis (Detail) - USD ($) | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-lived assets held for sale |  |  |  | $ (11,351,821) | $ (4,305,271) |
Long-lived assets held and used |  |  |  |  | (2,156,002) |
Total |  |  |  | (11,351,821) | $ (6,461,273) | $ (5,735,086)
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-lived assets held and used | $ 9,400,000 | $ 6,000,000 | $ 8,000,000 |  |  |
Long-lived assets held for sale |  |  |  | 55,230,000 |  |
Long-lived assets held for sale |  |  |  | (3,189,858) |  |
Total | 9,400,000 | 6,000,000 | 8,000,000 | 55,230,000 |  |
Long-lived assets held and used | (1,531,130) | (897,965) | (1,258,037) |  |  |
Total | (1,531,130) | (897,965) | (1,258,037) | (3,189,858) |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-lived assets held and used | 9,400,000 | 6,000,000 | 8,000,000 |  |  |
Long-lived assets held for sale |  |  |  | 55,230,000 |  |
Total | $ 9,400,000 | $ 6,000,000 | $ 8,000,000 | $ 55,230,000 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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