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Schedule of Future Amortization Charges Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]        
2021 $ 12,838      
2022 12,717      
2023 12,207      
2024 11,909      
2025 11,727      
Thereafter 136,116      
Net Book Value $ 197,514 $ 198,261 $ 186,467 $ 180,834