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Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Parenthetical) (Detail) | Sep. 30, 2020 | Dec. 31, 2019
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4.25% Convertible Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.25% |
3.90% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 3.90% |
4% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.00% |
4.55% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.55% |
Estimate of Fair Value Measurement [Member] | 4.25% Convertible Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.25% | 4.25%
Estimate of Fair Value Measurement [Member] | 3.90% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 3.90% |
Estimate of Fair Value Measurement [Member] | 4% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate |  | 4.00%
Estimate of Fair Value Measurement [Member] | 3.75% Callable Promissory Note |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 3.75% | 3.75%
Estimate of Fair Value Measurement [Member] | 4.55% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.55% | 4.55%
Estimate of Fair Value Measurement [Member] | 3.95% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate |  | 3.95%
Carrying Value [Member] | 4.25% Convertible Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.25% | 4.25%
Carrying Value [Member] | 3.90% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 3.90% |
Carrying Value [Member] | 4% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate |  | 4.00%
Carrying Value [Member] | 3.75% Callable Promissory Note |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 3.75% | 3.75%
Carrying Value [Member] | 4.55% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate | 4.55% | 4.55%
Carrying Value [Member] | 3.95% Promissory Note [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument stated interest rate |  | 3.95%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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