Quarterly Financial Information (Parenthetical) (Detail) - $ / shares |
Dec. 31, 2020 |
Sep. 30, 2020 |
|---|---|---|
| Preferred stock par value | $ 0.0001 | $ 0.0001 |
| Common stock par value | 0.0001 | |
| Common Class A [Member] | ||
| Common stock par value | 0.0001 | 0.0001 |
| Common Class B [Member] | ||
| Common stock par value | $ 0.0001 | 0.0001 |
| Common Class F [Member] | ||
| Common stock par value | $ 0.0001 |