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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
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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

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