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Income Tax Expense - Additional Information (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
Dec. 31, 2021
USD ($)
Statement [Line Items]        
Applicable income tax rate 15.00% 15.00% 15.00%  
Percentage of withholding tax 10.00%      
Deferred tax liability for withholding tax payable ¥ 65.5 ¥ 112.5   $ 10.4
Unrecognized deferred tax liability relating to undistributed earnings ¥ 195.5 ¥ 236.4   $ 30.9
PRC [member] | Bottom of range [member]        
Statement [Line Items]        
Unrecognized tax losses expiration period for subsidiaries that have a history of losses 5 years      
PRC [member] | Top of range [member]        
Statement [Line Items]        
Unrecognized tax losses expiration period for subsidiaries that have a history of losses 10 years      
Malaysia [member]        
Statement [Line Items]        
Unrecognized tax losses expiration period for subsidiaries that have a history of losses 10 years