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Credit Facilities - Summary of Maturities of Long-term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Abstract]    
Remaining three months of 2021 $ 0  
2022 5,625  
2023 11,250  
2024 11,250  
2025 16,875  
2026 and thereafter 140,000  
Total* $ 185,000 $ 190,550