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v3.22.1

Taxation - Reconciliation of Income Tax Expense (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Income before income tax expense | ¥ 2,177,158 |  | $ 341,643 |  | ¥ 3,668,512 |  | ¥ 3,701,006
Income tax expense computed at PRC statutory tax rates (25%) | 544,290 |  | 85,411 |  | 917,128 |  | 925,253
Non-deductible expenses | 28,725 |  | 4,508 |  | 22,063 |  | 27,333
Research and development expenses super - deduction | (185,801) |  | (29,156) |  | (225,715) |  | (194,000)
Change in valuation allowances | 50,473 |  | 7,920 |  | (5,285) |  | 16,420
Outside basis difference | (1,111) |  | (174) |  | 142 |  | (7,727)
Effect of international tax rate difference | 37,940 |  | 5,954 |  | 8,682 |  | (14,440)
Effect of preferential tax rate | (552,567) |  | (86,712) |  | (463,819) |  | (323,534)
Effect of withholding tax on dividend | 164,946 |  | 25,884 |  | 76,610 |  | 71,056
Other adjustments | (52,889) | [1] | (8,299) | [1] | (68,861) | [1] | 0
Income tax expense | ¥ 34,006 |  | $ 5,336 |  | ¥ 260,945 |  | ¥ 500,361
[1] | This amount represents tax savings relating to share-based compensation exercised in 2019 and 2020, which can be deducted when the Company did tax filing in 2020 and 2021 according to income tax guidance adopted.

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