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Long-Term Debt - Additional Information (Detail)
6 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt $ 220,000,000 $ 225,000,000
Revolving credit loan and term loan carried interest 6.10% 5.50%
Revolving credit facility and term loan maturity date Nov. 01, 2023  
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]    
Revolving credit facility maximum commitment $ 20,000,000 $ 20,000,000
Remaining commitments under the revolving credit loan facility $ 20,000,000  
Revolving credit loan and term loan carried interest 6.10% 5.50%
Revolving credit facility and term loan maturity date Nov. 17, 2022  
June 30, 2018 through December 31, 2018 [Member] | First Mortgage [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Long-term debt covenants aggregate leverage ratio 6.0  
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  
Existing Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Long-term debt $ 220,000,000  
Mandatory prepayments of consolidated excess cash flow due period 95 days  
Mandatory prepayments of consolidated excess cash flow required by existing credit agreement Commencing with the year ending December 31, 2018, 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; and no mandatory prepayments when the Total Leverage Ratio is less than or equal to 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%  
Existing Credit Agreement [Member] | Leverage Ratio Less than or Equal to 3.0 Times [Member]    
Line of Credit Facility [Line Items]    
Mandatory prepayments of excess cash flow 0.00%  
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%