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Income Tax Expense - Reconciliation of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Accounting profit before tax ¥ 1,033,319 $ 145,844 ¥ 1,181,067 ¥ 1,514,028
Computed tax expense at 15% (2018: 15%, 2017: 15%) 154,998 21,877 177,160 227,104
Adjustments resulting from:        
Non-deductible expenses 3,982 562 5,146 21,982
Tax-exempt income (6,171) (871) (3,634) (58,324)
Utilization of deferred tax benefits previously not recognized (5,076) (716) (5,518) (16,687)
Deferred tax benefits not recognized 6,613 933 2,183 8,084
Tax credits for research and development expense (31,863) (4,497) (22,407) (34,428)
Tax rate differential 26,223 3,701 24,437 21,061
Over provision in respect of previous years current tax (6,985) (986) (729) (2,867)
Withholding tax expense 30,898 4,361 30,029 29,447
Others       (1,200)
Consolidated income tax expense reported in the statement of profit or loss ¥ 172,619 $ 24,364 ¥ 206,667 ¥ 194,172