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v3.20.2

Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Detail) | 9 Months Ended
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Sep. 30, 2020
4.25% Convertible Senior Notes [Member] |
Debt Instrument [Line Items] |
Debt instrument, maturity date | 2037
Valuation Methodology | Quoted price
3.90% Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument, maturity date | 2032
Valuation Methodology | Discounted cash flow method/Level 3 inputs
4% Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument, maturity date | 2031
Valuation Methodology | Discounted cash flow method/Level 3 inputs
3.75% Callable Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument, maturity date | 2036
Valuation Methodology | Discounted cash flow method/Level 3 inputs
4.55% Promissory note [Member] |
Debt Instrument [Line Items] |
Debt instrument, maturity date | 2036
Valuation Methodology | Discounted cash flow method/Level 3 inputs

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