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Long-term Debt - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Apr. 16, 2019 | Mar. 29, 2019 | Feb. 19, 2019 | Jan. 16, 2019 | Aug. 17, 2018 | Apr. 27, 2018 | Apr. 17, 2018 | Mar. 27, 2018 | Feb. 08, 2018 | Jan. 10, 2018 | Dec. 11, 2017 | May 16, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 14, 2018 | Dec. 07, 2017 | Mar. 01, 2017 | May 18, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,712,500 |  |  |  |  |  |
Long-term debt, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 445,971,281 | $ 386,975,841 |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,717,059 | 56,254,073 | $ 55,630,352 |  |  |  |
Term loan financial covenants, cash requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,930,059 |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,002,490 | 3,231,323 | 3,363,012 |  |  |  |
Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,374,435 | 7,871,170 |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 858,582 | $ 690,842 | $ 715,587 |  |  |  |
Debt,weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.34% | 3.97% | 3.43% |  |  |  |
Interest expense, debt, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,150,386 | $ 15,640,377 | $ 14,149,326 |  |  |  |
Interest costs capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 813,423 | $ 1,660,802 |  |  |  |
Term Loan Entered into on October 9, 2008 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 5,920,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Entered into on September 23, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 4,122,370 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value to term loan ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Percentage of total debt to total market value adjusted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Percentage of dividends paid to free cash flow |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value to term loan ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |
EBITDA to interest expense ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.51 |  |  |  |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.80% |  |  |  |  |  |
Term Loan Entered Into On May 18, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,480,000
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  | $ 33,150,000 |  | $ 32,500,000 |  |  |  |  |  |  |  |
Term Loan Entered into on March 27, 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 1,036,265 | $ 625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Refinanced On A Long Term Basis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, total |  |  |  |  |  |  |  |  | $ 27,675,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Entered into on June 12, 2014 and September 15, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,574,184 |  |  |
Term Loan Entered Into March 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 76,020,000 |
Proceeds from issuance of debt |  |  |  |  |  |  |  | $ 35,262,500 |  |  | $ 35,525,000 |  |  |  |  |  |  |  |  |  |
Term Loan Entered December 7, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500,000 |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | $ 11,775,000 |  | $ 10,500,000 |  |  |  |  |  |  |  |  |
Term Loan Entered into on April 14, 2014 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |
Long-term debt, total | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  | 60,000 |  |  |  |  |  |  |
Repayments of debt |  | $ 700,000 |  |  | $ 700,000 |  |  |  |  |  |  |  |  | 640,000 |  |  |  |  |  |  |
Term Loan Entered into on March 29, 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maximum borrowing capacity | 25,458,432 |  |  |  |  |  |  |  |  |  |  |  |  | 25,458,432 |  |  |  |  |  |  |
Long-term debt, total | 981,895 |  |  |  |  |  |  |  |  |  |  |  |  | $ 981,895 |  |  |  |  |  |  |
Repayments of debt | $ 4,001,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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