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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 16, 2030 | Mar. 05, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization expense for the deferred costs |  |  | $ 11.0 | $ 9.0 |
ASU 2019-12 [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Jan. 31, 2021 |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  |  | true |  |
Other Assets [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred costs |  |  | $ 129.1 |  | $ 132.9
Convertible Senior Notes [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Debt instrument principal amount | $ 575.0 | $ 500.0 | $ 575.0 |  |
Debt instrument percentage of aggregate principal amount | 0.25% | 0.25% | 0.25% |  |
Debt instrument maturity year | 2026 | 2026 |  |  |
Debt instrument additional aggregate principal amount | $ 75.0 |  | $ 75.0 |  |
Net proceeds from deducting initial purchase discounts and other debt issuance costs |  | $ 561.8 | $ 561.8 |  |

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