| Fair value measurement - Summary of Valuation Inputs To The Fair Value of Purchase Options (Detail) - Investments in equity securities | Jun. 30, 2023 | 
|---|---|
| Growth factor | |
| Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] | |
| Unobservable input, assets | 0.030 | 
| Discount rate | |
| Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] | |
| Unobservable input, assets | 0.119 | 
| X | ||||||||||
| 
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. No definition available. 
 | 
| X | ||||||||||
| 
- Definition The value of significant unobservable input used in the measurement of the fair value of assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |