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Fair Value Measurement - Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member]
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 30, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash ¥ 95,055 $ 14,916   ¥ 17,926
Assets measured at fair value on recurring basis 17,483,920 2,743,608   13,164,736
Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 892,598 140,068   268,634
Term Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 10,484,066 1,645,179   7,286,100
Adjustable-Rate Financial Products [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 6,007,859 942,764   5,592,076
Equity investments with readily determinable fair value [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 4,342 $ 681    
Fair Value Measurement Using Inputs Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets measured at fair value on recurring basis     ¥ 4,342  
Fair Value Measurement Using Inputs Level 1 [Member] | Equity investments with readily determinable fair value [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments     ¥ 4,342  
Fair Value Measurement Using Inputs Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash 95,055     17,926
Assets measured at fair value on recurring basis 17,479,578     13,164,736
Fair Value Measurement Using Inputs Level 2 [Member] | Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 892,598     268,634
Fair Value Measurement Using Inputs Level 2 [Member] | Term Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 10,484,066     7,286,100
Fair Value Measurement Using Inputs Level 2 [Member] | Adjustable-Rate Financial Products [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments 6,007,859     ¥ 5,592,076
Fair Value Measurement Using Inputs Level 2 [Member] | Equity investments with readily determinable fair value [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term investments ¥ 0