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Subsequent Events (Detail) - USD ($) shares in Thousands, $ in Millions | Apr. 08, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Subsequent events |  |  |  |
Common stock, shares issued |  | 69,096 | 68,870 |
3.125% Senior Convertible Notes |  |  |  |
Subsequent events |  |  |  |
Stated interest rate |  | 3.125% |  | 3.125%
Subsequent Events | 3.125% Senior Convertible Notes |  |  |  |
Subsequent events |  |  |  |
Aggregate principal of debt converted and retired | $ 194 |  |  |
Common stock, shares issued | 13,750 |  |  |
Payments to debt holders in conjunction with the conversion and retirement of debt | $ 14 |  |  |

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