Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Detail)

v3.10.0.1
Debt - Narrative (Detail) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 21, 2018
Dec. 31, 2017
Dec. 22, 2016
Line of Credit Facility [Line Items]        
Long-term outstanding borrowings $ 29,176,000   $ 24,516,000  
Capital Leases        
Line of Credit Facility [Line Items]        
Debt instrument, weighted average interest rates 4.86%      
Term Loan        
Line of Credit Facility [Line Items]        
Debt Instrument, maximum borrowing capacity   $ 30,000,000   $ 75,000,000
Current outstanding borrowings $ 6,600,000   3,800,000  
Long-term outstanding borrowings 91,500,000   66,600,000  
Unamortized transaction costs $ 1,300,000   900,000  
Debt instrument, percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights 100.00%      
Debt instrument, percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment 100.00%      
Debt instrument, percentage of excess cash flow to be used for mandatory prepayment starting next fiscal year 75.00%      
Debt instrument, step-down percentage 50.00%      
Debt instrument covenant leverage ratio 325.00%      
Debt instrument, percentage of net cash proceeds from issuances of permitted equity securities to be used for mandatory prepayment 100.00%      
Term Loan | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument covenant leverage ratio 275.00%      
Term Loan | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument covenant leverage ratio 325.00%      
Term Loan | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 0.50%      
Term Loan | LIBOR        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 1.00%      
Term Loan | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument applicable margin 2.25%      
Term Loan | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument applicable margin 4.00%      
Term Loan | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument applicable margin 1.25%      
Term Loan | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument applicable margin 3.00%      
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Debt instrument, percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights 100.00%      
Debt instrument, percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment 100.00%      
Debt instrument, percentage of excess cash flow to be used for mandatory prepayment starting next fiscal year 75.00%      
Debt instrument, step-down percentage 50.00%      
Debt instrument covenant leverage ratio 325.00%      
Debt instrument, percentage of net cash proceeds from issuances of permitted equity securities to be used for mandatory prepayment 100.00%      
Line of credit facility maximum borrowing capacity       75,000,000
Long-term outstanding borrowings $ 29,200,000   24,500,000  
Unamortized transaction costs $ 800,000   $ 900,000  
Line of credit facility, swingline sublimit       $ 10,000,000
Revolving Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Debt covenant, leverage ratio required for step-down percentage 2.75      
Revolving Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Debt covenant, leverage ratio required for step-down percentage 3.25      
Revolving Credit Facility | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 0.50%      
Revolving Credit Facility | LIBOR        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 1.00%      
Revolving Credit Facility | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 2.25%      
Revolving Credit Facility | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 4.00%      
Revolving Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 1.25%      
Revolving Credit Facility | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument variable interest rate 3.00%