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Reconciliation of Tax Computed By Applying Respective Statutory Income Tax Rate to Effective Income Tax Rate (Detail) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY
Income Tax Disclosure [Abstract] |  |  |  |
Expected taxation at PRC EIT statutory rate | $ 503,205 | 3,046,254 | 2,991,359 | 1,952,295
Effect of differing tax rates in different jurisdictions | 51,694 | 312,938 | 138,931 | 43,260
Permanent differences - non-taxable income | (11,509) | (69,673) | (58,157) | (2,804)
Permanent differences - non-deductible expenses | 27,872 | 168,735 | 58,201 | 9,989
Tax incentives relating to research and development expenditures | (52,638) | (318,652) | (154,977) | (105,966)
Effect of tax holidays inside PRC | (352,054) | (2,131,233) | (1,489,331) | (715,897)
Over-accrued EIT for previous years | (5,448) | (32,982) | (15,084) | (66,960)
Withholding tax on PRC subsidiaries' undistributed earnings | 92,546 | 560,243 | 0 | 0
Addition to valuation allowance | 48,450 | 293,300 | 103,217 | 74,944
Taxation for the year | $ 302,118 | 1,828,930 | 1,574,159 | 1,188,861
Effective tax rate | 15.01% | 15.01% | 13.16% | 15.22%
Effect of tax holidays inside PRC on basic earnings per Class A and Class B ordinary share | $ 10.06 | 60.92 | 42.63 | 20.52

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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