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Debt (Detail) - USD ($)
May 09, 2017
Sep. 30, 2017
Dec. 31, 2016
Long-term debt:      
Outstanding debt   $ 27,000,000 $ 25,847,000
Revolving credit facility      
Long-term debt:      
Credit facility, increase in aggregate principal amount of commitments available $ 75,000,000    
Credit facility, borrowing capacity 200,000,000    
Credit Facility additional borrowing amount $ 100,000,000    
Percentage of lesser of aggregate revolving commitments and borrowing base for excess availability of credit facility 12.50%    
Minimum consolidated fixed charge coverage ratio 115.00%    
Credit Facility, maturity May 09, 2022    
Outstanding debt   $ 27,000,000  
Weighted average interest rate   3.20%  
Debt issuance cost   $ 1,200,000  
Revolving credit facility | Federal Funds Rate      
Long-term debt:      
Credit Facility, interest rate above base rate 0.50%    
Revolving credit facility | LIBOR      
Long-term debt:      
Credit Facility, interest rate above base rate 2.00%    
Revolving credit facility | Minimum      
Long-term debt:      
Credit Facility, fee for undrawn amounts 0.325%    
Revolving credit facility | Minimum | LIBOR      
Long-term debt:      
Credit Facility, interest rate above base rate 2.00%    
Revolving credit facility | Minimum | Base Rate      
Long-term debt:      
Credit Facility, interest rate above base rate 1.00%    
Revolving credit facility | Maximum      
Long-term debt:      
Credit Facility, fee for undrawn amounts 0.375%    
Amount of excess availability under revolving credit facility required based on facility covenants $ 15,000,000    
Revolving credit facility | Maximum | LIBOR      
Long-term debt:      
Credit Facility, interest rate above base rate 2.50%    
Revolving credit facility | Maximum | Base Rate      
Long-term debt:      
Credit Facility, interest rate above base rate 1.50%    
Revolving credit facility | Swingline Borrowings      
Long-term debt:      
Credit facility, borrowing capacity $ 20,000,000    
Revolving credit facility | Letter of Credit      
Long-term debt:      
Credit facility, borrowing capacity $ 15,000,000