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Long-Term Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Nov. 14, 2019 | Dec. 31, 2018
Line of Credit Facility [Line Items] |  |  |
Long-term debt | $ 263,500,000 |  | $ 252,000,000
Credit facility interest rate margins | 2.00% |  |
Revolving credit outstanding balance | $ 248,712,452 |  | 242,776,520
Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt covenants aggregate leverage ratio | 2.5 |  |
Term Loan [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | $ 252,600,000 |  | $ 252,000,000
Revolving credit loan and term loan carried interest | 5.80% |  |
Term Loan [Member] | Floor Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term loan facility interest rate | 1.00% |  |
Revolving Credit Loan [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | $ 11,000,000 |  |
Revolving credit facility maximum commitment | $ 20,000,000 |  |
Revolving credit loan and term loan carried interest | 5.80% |  | 6.50%
Remaining commitments under the revolving credit loan facility | $ 9,000,000 |  |
Revolving credit outstanding balance | 11,000,000 |  |
Borrowing from revolving facility | $ 10,000,000 |  |
March 31, 2019 through December 31, 2019 [Member] | First Mortgage [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt covenants aggregate leverage ratio | 5.75 |  |
March 31, 2020 and thereafter [Member] | First Mortgage [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt covenants aggregate leverage ratio | 5.25 |  |
Promissory Note [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | $ 13,500,000 | $ 13,500,000 |
Promissory notes issued |  | $ 16,500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |
Existing Credit Agreement [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | $ 250,000,000 |  |
Mandatory prepayments of consolidated excess cash flow due period | 95 days |  |
Mandatory prepayments of consolidated excess cash flow required by existing credit agreement | The credit agreement requires mandatory prepayments equal to 50% of Excess Cash Flow (as defined in the credit agreement) when the Company's Total Leverage Ratio (as defined in the credit agreement) is greater than 3.5x; mandatory prepayments equal to 25% of Excess Cash Flow when the Total Leverage Ratio is less than or equal to 3.5x but greater than 3.0x; |  |
Existing Credit Agreement [Member] | Leverage Ratio Greater than 3.5 Times [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Mandatory prepayments of excess cash flow | 50.00% |  |
Existing Credit Agreement [Member] | Leverage Ratio Less than or Equal To 3.5 Times and Greater than 3.0 Times [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Mandatory prepayments of excess cash flow | 25.00% |  |
New Credit Agreement [Member] | LIBOR [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility interest rate margins | 4.00% |  |
New Credit Agreement [Member] | Base Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit facility interest rate margins | 3.00% |  |

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