Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information Credit Agreement (Detail)

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Commitments and Contingencies - Additional Information Credit Agreement (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]          
Senior secured revolving credit facility maximum borrowing capacity $ 60,000,000   $ 60,000,000    
Revolving credit facility maturity date     Jun. 01, 2020    
Date the Company entered into a Credit Agreement     Jun. 18, 2014    
Credit agreement date     Jun. 01, 2014    
Standby letters of credit borrowing capacity 10,000,000   $ 10,000,000    
Standby letters of credit, utilized amount $ 533,000   $ 533,000    
Credit facility interest rate description     Credit Facility will bear interest, at the Company's option, at either the (i) Base Rate (defined as the highest of (a) the Bank's prime rate, (b) the Federal Funds Rate plus 1.5% and (c) one-monthLIBOR plus 1.5%), or (ii) at a variable rate between 0.875% and 1.125% above LIBOR, based upon the total funded debt to EBITDA ratio.    
LIBOR rate duration period     1 month    
Credit agreement, unused capacity, commitment fee percentage 0.10%        
Interest expense $ 342,000 $ 370,000 $ 1,054,000 $ 1,126,000  
Credit agreement, amount outstanding 0   $ 0   $ 0
Credit facility covenants     (i) an EBITDAR Coverage Ratio (as defined in the Credit Agreement) of not less than 1.25:1.0 as of each quarter end and (ii) total funded debt to EBITDA not greater than 2.0:1.0    
Minimum EBITDAR coverage ratio     1.25%    
Maximum Total Funded Debt to EBITDA ratio     2.00%    
Credit agreement, pledge percentage     100.00%    
Compliance description     As of September 30, 2018, the Company was in compliance with all financial and non-financial covenants.    
LIBOR [Member]          
Line of Credit Facility [Line Items]          
Base spread on variable rate     1.50%    
Federal Funds Rate [Member]          
Line of Credit Facility [Line Items]          
Base spread on variable rate     1.50%    
Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Interest expense $ 26,000 $ 28,000 $ 78,000 $ 83,000  
Minimum [Member] | LIBOR [Member]          
Line of Credit Facility [Line Items]          
Base spread on variable rate     0.875%    
Maximum [Member] | LIBOR [Member]          
Line of Credit Facility [Line Items]          
Base spread on variable rate     1.125%