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Debt and Credit Facilities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Apr. 12, 2017
Jun. 30, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]            
Accrued interest     $ 100,000      
Long-term debt     164,565,000   $ 233,154,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument fee     1,100,000   100,000  
Term Loan Facility | Line of Credit            
Debt Instrument [Line Items]            
Revolving credit facility $ 175,000,000          
Term Loan Facility | Secured Debt            
Debt Instrument [Line Items]            
Debt instrument fee     3,000,000      
Debt instrument discount     3,200,000      
Long-term debt     167,749,000   0  
Quarterly debt principal payment     $ 1,100,000      
Prepayment penalty (as a percent)     1.00%      
7.875% senior secured notes due April 15, 2019 | Senior Notes            
Debt Instrument [Line Items]            
Cash payment for debt redemption $ 74,000,000          
Interest on Senior Secured Notes (as a percent) 7.875%   7.875%     7.875%
Write off of deferred financing fees   $ 1,600,000        
Interest costs   $ 1,500,000        
Long-term debt     $ 0   233,154,000  
Third ARLS Agreement | Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facility $ 65,000,000     $ 40,000,000    
Commitment fee (as a percent)     0.25%      
Availability of borrowing     $ 62,900,000      
Third ARLS Agreement | Line of Credit | Letter of Credit            
Debt Instrument [Line Items]            
Revolving credit facility $ 10,000,000.0          
Fixed charge coverage ratio 100.00%          
Borrowing availability maintenance amount $ 5,000,000          
Borrowing availability maintenance (as a percent) 10.00%          
Outstanding borrowings     $ 2,100,000   $ 2,500,000