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Debt and Credit Facilities - Additional Information (Detail) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Sep. 18, 2019
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 $ 1,600,000      
Debt instrument discount 1,700,000      
Long-term debt 155,572,000 $ 156,384,000    
Third ARLS Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Secured term loan facility     $ 90,000,000.0  
Debt instrument fee 500,000 600,000    
Capacity available for trade purchases     $ 7,000,000.0  
Basis points premium     1.00%  
Outstanding borrowings 15,000,000 0    
Availability of borrowing 56,100,000      
Third ARLS Agreement | Line of Credit | Letter of Credit        
Debt Instrument [Line Items]        
Outstanding borrowings $ 1,600,000 $ 1,600,000