Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information Credit Agreement (Detail)

v3.8.0.1
Commitments and Contingencies - Additional Information Credit Agreement (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]      
Senior secured revolving credit facility maximum borrowing capacity $ 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    
Standby letters of credit, utilized amount $ 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-month LIBOR 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 $ 1,496,000 $ 1,533,000 $ 1,726,000
Credit agreement, amount outstanding $ 0    
Credit facility covenants (i) an EBITDAR Coverage Ratio (as defined in the Credit Agreement) of not less than 1.251.0 as of each quarter end and (ii) total funded debt to EBITDA not greater than 2.01.0    
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 December 31, 2017, 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 $ 110,000 $ 116,000 $ 130,000
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%