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Reconciliation of Effective Income Tax Provision of Tax Computed By Applying Statutory Income Tax Rate to Pre-Tax Income (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 CNY (¥) ¥ / shares | Dec. 31, 2015 CNY (¥) ¥ / shares | Dec. 31, 2014 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Expected taxation at PRC statutory tax rate | $ 522,441 | ¥ 3,627,302 | ¥ 9,476,656 | ¥ 3,587,693
Effect of differing tax rates in different jurisdictions | 105,944 | 735,566 | (5,253,700) | 676,663
Non-taxable income | (10,547) | (73,226) | (65,411) | (12,504)
Non-deductible expenses | 16,496 | 114,534 | 165,264 | 123,245
Research and development super-deduction | (104,537) | (725,800) | (767,858) | (538,305)
Effect of PRC preferential tax rates and tax holiday | (266,660) | (1,851,421) | (1,547,392) | (1,897,184)
Effect of tax rate changes on deferred taxes | (1,741) | (12,085) | 79,947 | 28,146
Over -accrued EIT for previous years | (74,842) | (519,631) | (248,673) | (153,121)
PRC withholding tax | 40,737 | 282,838 | 2,470,733 | 0
Addition to valuation allowance | 192,354 | 1,335,517 | 1,164,811 | 416,539
Taxation for the year | $ 419,645 | ¥ 2,913,594 | ¥ 5,474,377 | ¥ 2,231,172
Effective tax rate | 20.08% | 20.08% | 14.44% | 15.41%
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share | (per share) | $ 7.69 | ¥ 53.41 | ¥ 44.31 | ¥ 53.61

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