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Income Tax Expense - Reconciliation of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Accounting profit before tax $ 176,538 ¥ 1,181,067 ¥ 1,514,028 [1] ¥ 896,232 [1]
Computed tax expense of 15% (2017: 15%, 2016: 15%) 26,481 177,160 227,104 134,435
Adjustments resulting from:        
Non-deductible expenses 769 5,146 21,982 7,039
Tax-exempt income (543) (3,634) (58,324) (178)
Utilization of deferred tax benefits previously not recognized (825) (5,518) (16,687) (5,010)
Deferred tax benefits not recognized 326 2,183 8,084 9,045
Tax credits for research and development expense (3,349) (22,407) (34,428) (34,482)
Tax rate differential 3,653 24,437 21,061 25,321
Under/(over) provision in respect of previous years current tax (109) (729) (2,867) 7,175
Withholding tax expense 4,488 30,029 29,447 16,925
Others     (1,200)  
Consolidated income tax expense reported in the statement of profit or loss $ 30,891 ¥ 206,667 ¥ 194,172 [1] ¥ 160,270 [1]
[1] Restated