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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Staff Costs (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 income statement [line items]        
Wages and salaries ¥ 1,364,751 $ 210,893 ¥ 1,122,712 ¥ 1,176,465
Contribution to defined contribution plans 287,830 44,478 324,623 296,073
Executive bonuses 59,908 9,257 59,791 57,674
Staff welfare 94,982 14,677 82,692 76,689
Staff severance cost 19,712 3,046 15,454 28,018
Others 3,439 532 6,012 8,441
Staff costs 1,830,622 282,883 1,611,284 1,643,360
Cost of sales [member]        
Disclosure of income statement [line items]        
Staff costs 912,304 140,977 808,763 822,570
Research and development expenses [Member]        
Disclosure of income statement [line items]        
Staff costs 258,118 39,886 243,049 213,826
Selling general and administrative expenses [member]        
Disclosure of income statement [line items]        
Staff costs ¥ 660,200 $ 102,020 ¥ 559,472 ¥ 606,964