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Transactions With Related Parties - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 25, 2016 | May 26, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 12, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |
Due to related parties, current, total |  |  | $ 7,930,642 | $ 14,209,624 |  |
Revenue from related parties |  |  |  | $ 1,973,643 |  | $ 7,592,784
The Manager [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee, per day, per vessel |  |  | 440 |  |  |
Management fee, per day, per vessel, under bareboat charter |  |  | $ 125 |  |  |
Vessel brokerage commission percentage |  |  | 1.25% | 1.25% |  | 1.25%
Crew management fee, per month, per vessel |  |  | $ 2,500 |  |  |
Sales and purchase broker commission fee, percentage |  |  | 1.00% |  |  |
Due to related parties, current, total |  |  | $ 7,930,642 | $ 14,209,624 |  |
The Manager [Member] | Additional Charge Per Day When Visits Exceed Five Days In Twelve Month Period [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 500 |  |  |
The Manager [Member] | Commission Fees Incurred And Capitalized To The Cost Of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 1,598,858 | 525,978 |  | $ 421,639
The Manager [Member] | Voyage Expenses Related Party [Member] | Brokerage Commission Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 2,037,917 |  | $ 1,912,505 | 1,772,240
The Manager [Member] | Management Fees Related Party [Member] | Management Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 7,027,195 | 7,205,490 |  | 7,346,180
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Superintendent Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 137,000 | 125,500 |  | 172,000
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Amounts Paid in Connection to Charter Agreements for the Vessels Operating Expense [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 0 | 675,408 |  | 2,969,843
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Crew Management Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 377,500 |  |  |
The Manager [Member] | Net Gain on Sale of Vessels [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 184,000 | 119,900 |  | 13,711
The Manager [Member] | General and Administrative Expense [Member] | Reimbursed Compensation [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 1,210,036 | 1,127,307 |  | 1,114,130
The Manager [Member] | General and Administrative Expense [Member] | Office Space Rent [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 84,686 | 82,192 |  | 72,907
The Manager [Member] | Impairment Loss [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 212,650 |  |  |
Emihar Petroleum Inc [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 0 | 1,973,643 |  | 7,592,784
Brave [Member] | Vessel Construction Fee Per Vessel [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party | $ 490,000 | $ 390,000 |  |  |  |
Brave [Member] | Capitalized Construction Supervision Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | $ 1,790,789 | $ 535,864 |  | $ 854,022

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