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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, 2015 USD ($) $ / shares | Dec. 31, 2015 CNY (¥) ¥ / shares | Dec. 31, 2014 CNY (¥) ¥ / shares | Dec. 31, 2013 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Expected taxation at PRC statutory tax rate | $ 1,462,944 | ¥ 9,476,656 | ¥ 3,587,693 | ¥ 3,046,254
Effect of differing tax rates in different jurisdictions | (811,032) | (5,253,700) | 676,663 | 312,938
Non-taxable income | (10,098) | (65,411) | (12,504) | (69,673)
Non-deductible expenses | 25,512 | 165,264 | 123,245 | 168,735
Research and development super-deduction | (118,537) | (767,858) | (538,305) | (318,652)
Effect of PRC preferential tax rates and tax holiday | (238,876) | (1,547,392) | (1,897,184) | (2,152,806)
Effect of tax rate changes on deferred taxes | 12,342 | 79,947 | 28,146 | 21,573
Over-accrued EIT for previous years | (38,388) | (248,673) | (153,121) | (32,982)
PRC withholding tax | 381,415 | 2,470,733 | 0 | 560,243
Addition to valuation allowance | 179,816 | 1,164,811 | 416,539 | 293,300
Taxation for the year | $ 845,098 | ¥ 5,474,377 | ¥ 2,231,172 | ¥ 1,828,930
Effective tax rate | 14.44% | 14.44% | 15.41% | 15.01%
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share | (per share) | $ 6.84 | ¥ 44.31 | ¥ 53.61 | ¥ 61.53

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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