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Debt - Summary of Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 44,111 | $ 45,956 | $ 377,052
Less: Short-term debt |  |  | (34,548)
Total Long-term debt | 44,111 | 45,956 | 342,504
3.5% senior notes due in 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short Term Debt |  |  | 34,548
4.6% senior notes due to related parties in 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 44,111 | $ 45,956 | 86,371
2.5% Convertible bonds due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  |  | 193,643
2.5% Non convertible bonds due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  |  | $ 62,490

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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