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Capital and reserves - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
$ / shares
GHI Ordinary Shares  
Disclosure of reserves within equity [line items]  
Par value per share $ 0.000001
Ordinary shares, voting rights one
GHI Ordinary Shares | GHL [Member]  
Disclosure of reserves within equity [line items]  
Conversion Ratio Common Stock 1.3032888
GHI Convertible Redeemable Preference Shares  
Disclosure of reserves within equity [line items]  
Par value per share $ 0.000001
Preferred stock, dividend rate, percentage 8.00%
Preferred stock, voting rights one
Preferred stock, Interest rate 6.00%
GHL A Ordinary Shares  
Disclosure of reserves within equity [line items]  
Par value per share $ 0.000001
Stockholders' equity note, stock split, exchange ratio 1.3032888
Ordinary shares, voting rights one
GHL B Ordinary Shares  
Disclosure of reserves within equity [line items]  
Par value per share $ 0.000001
Stockholders' equity note, stock split, exchange ratio 1.3032888
Stockholders' equity note, stock split one
Ordinary shares, voting rights forty-five
Exchange Of GHI Shares For GHL Shares As Part Of Reverse Recapitalization [Member]  
Disclosure of reserves within equity [line items]  
Conversion Ratio Common Stock 1.3032888