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Debt and Credit Facilities - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Apr. 12, 2017
Term Loan Facility | Line of Credit      
Debt Instrument [Line Items]      
Secured term loan facility     $ 175,000,000
Term Loan Facility | Secured Debt      
Debt Instrument [Line Items]      
Debt instrument fee $ 2,000,000    
Debt instrument discount 2,100,000    
Long-term debt 157,996,000 $ 163,758,000  
Third ARLS Agreement | Line of Credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument fee 600,000 700,000  
Availability of borrowing 63,400,000    
Outstanding borrowings 0    
Third ARLS Agreement | Line of Credit | Letter of Credit      
Debt Instrument [Line Items]      
Outstanding borrowings 1,600,000 $ 1,700,000  
Borrowing availability threshold $ 5,000,000    
Borrowing availability threshold (as a percent) 10.00%