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Long-Term Debt - Scheduled Repayments of Credit Facility (Detail) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2020 $ 2,250,000  
2021 750,000  
2022 21,250,000  
2023 241,500,000  
Total $ 265,750,000 $ 263,500,000