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Earnings Per Share/ADS - Schedule of Basic and Diluted Earnings Per Share (Detail)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
¥ / shares
shares
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Numerator:        
Net income attributable to ordinary shareholders ¥ 2,148,566 $ 337,157 ¥ 3,405,229 ¥ 3,199,966
Denominator:        
Weighted average ordinary shares outstanding [1] 499,861,764 499,861,764 477,467,268 474,328,384
Basic earnings per ADS | (per share) [1] ¥ 4.30 $ 0.67 ¥ 7.13 ¥ 6.75
Numerator:        
Net income attributable to ordinary shareholders ¥ 2,148,566 $ 337,157 ¥ 3,405,229 ¥ 3,199,966
Denominator:        
Weighted average ordinary shares outstanding [1] 499,861,764 499,861,764 477,467,268 474,328,384
Dilutive effect of share-based awards 619,776 619,776 2,219,112 3,732,604
Weighted average number of shares outstanding-diluted [1] 500,481,540 500,481,540 479,686,380 478,060,988
Diluted earnings per ADS | (per share) [1] ¥ 4.29 $ 0.67 ¥ 7.10 ¥ 6.69
Earnings Per Share Attributable To Ordinary Shareholders [Abstract]        
Net income per share – basic | (per share) [1] 4.30 0.67 7.13 6.75
Net income per share – diluted | (per share) [1] 4.29 0.67 7.10 6.69
ADR [Member]        
Denominator:        
Basic earnings per ADS | (per share) 17.19 2.70 28.53 26.99
Denominator:        
Diluted earnings per ADS | (per share) 17.17 2.69 28.40 26.77
Earnings Per Share Attributable To Ordinary Shareholders [Abstract]        
Net income per share – basic | (per share) 17.19 2.70 28.53 26.99
Net income per share – diluted | (per share) ¥ 17.17 $ 2.69 ¥ 28.40 ¥ 26.77
[1] Par value per share and the number of shares have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that were effective on February 5, 2021 as detailed in Note 2(a) and Note 22.