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Long-Term Debt - Scheduled Repayments of Credit Facility (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 7,500,000  
2021 6,000,000  
2022 11,000,000  
2023 239,000,000  
Total $ 263,500,000 $ 252,000,000