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Dividends Declared and Paid - Summary of Dividends Declared and Paid (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of dividends declared and paid on ordinary capital [line items]        
Dividends on ordinary shares ¥ 245,871   ¥ 238,758 ¥ 597,459
Dividend paid in cash 245,871 $ 37,994 238,758  
Final dividend [member]        
Disclosure of dividends declared and paid on ordinary capital [line items]        
Dividends on ordinary shares ¥ 245,871 $ 37,994 ¥ 238,758