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Long-term Debt - Summary of Reconciliation of the Scheduled Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Current portion of 2018 Term Loan $ 5,350 $ 5,350
Current portion of discount and unamortized debt issuance costs (2,309) (2,321)
Total current portion of long-term debt 3,041 3,029
Noncurrent portion of 2018 Term Loan 516,275 518,950
Noncurrent portion of discount and unamortized debt issuance costs (5,445) (6,588)
Total long-term debt, net of current portion $ 510,830 $ 512,362