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Related Party Transactions - Summary of Amounts Due to our Parent (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of related Party transactions due to our parent [Line Items]      
Short-term lease liability $ 3,014 $ 3,033 $ 2,795
Long-term lease liability 6,960 7,831 10,424
Long-term borrowing with related party [Member]      
Schedule of related Party transactions due to our parent [Line Items]      
4.6% Senior Note due related party 44,111 45,956 86,371
Accounts payable and accrued expenses [Member]      
Schedule of related Party transactions due to our parent [Line Items]      
Royalties and other expenses 3,590 3,631 2,691
Short-term operating lease liabilities [Member]      
Schedule of related Party transactions due to our parent [Line Items]      
Short-term lease liability 1,347 1,399 1,288
Other non-current liabilities [Member]      
Schedule of related Party transactions due to our parent [Line Items]      
Accrued interest on 4.6% Senior Note with related party 5,221 4,918 5,169
Long-term lease liabilities [Member]      
Schedule of related Party transactions due to our parent [Line Items]      
Long-term lease liability $ 2,004 $ 2,454 $ 3,413