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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, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of income statement [line items]        
Wages and salaries ¥ 1,122,712 $ 158,461 ¥ 1,176,465 ¥ 1,158,320
Contribution to defined contribution plans 324,623 45,818 296,073 258,190
Executive bonuses 59,791 8,439 57,674 59,908
Staff welfare 82,692 11,671 76,689 76,392
Staff severance cost 15,454 2,181 28,018 107,732
Cost of share-based payment       1,592
Others 6,012 849 8,441 1,870
Staff costs 1,611,284 227,419 1,643,360 1,664,004
Cost of sales [member]        
Disclosure of income statement [line items]        
Staff costs 808,763 114,150 822,570 850,580
Research and development expenses [Member]        
Disclosure of income statement [line items]        
Staff costs 243,049 34,304 213,826 197,991
Selling general and administrative expenses [member]        
Disclosure of income statement [line items]        
Staff costs ¥ 559,472 $ 78,965 ¥ 606,964 ¥ 615,433