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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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Short-term debt.

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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
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-Topic 470
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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