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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Accrued Liabilities [Abstract]
Interest on long-term debt	$ 3,656,811	$ 2,839,121
Administrative expenses	251,257	204,472
Other operating costs	660,000	563,333
Vessel operating and voyage expenses	2,311,420	2,273,553
Total	$ 6,879,488	$ 5,880,479

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Accrued administrative expenses current.

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Schedule Of Accrued Liabilities [Abstract]

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Vessel operating and voyage expenses.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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