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Reconciliation of Effective Income Tax Provision of Tax Computed By Applying Statutory Income Tax Rate to Pre-Tax Income (Detail) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
Income Tax Disclosure [Abstract]
Expected taxation at PRC EIT statutory rate	$ 578,231us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3,587,693us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3,046,254us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	2,991,359us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of differing tax rates in different jurisdictions	109,058us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	676,663us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	312,938us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	138,931us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Permanent differences - non-taxable income	(2,015)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(12,504)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(69,673)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(58,157)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Permanent differences - non-deductible expenses	19,864us-gaap_IncomeTaxReconciliationNondeductibleExpense	123,245us-gaap_IncomeTaxReconciliationNondeductibleExpense	168,735us-gaap_IncomeTaxReconciliationNondeductibleExpense	58,201us-gaap_IncomeTaxReconciliationNondeductibleExpense
Tax incentives relating to research and development expenditures	(86,759)us-gaap_IncomeTaxReconciliationDeductionsOther	(538,305)us-gaap_IncomeTaxReconciliationDeductionsOther	(318,652)us-gaap_IncomeTaxReconciliationDeductionsOther	(154,977)us-gaap_IncomeTaxReconciliationDeductionsOther
Effect of preferential tax rates inside the PRC	(305,771)us-gaap_IncomeTaxReconciliationTaxHolidays	(1,897,184)us-gaap_IncomeTaxReconciliationTaxHolidays	(2,152,806)us-gaap_IncomeTaxReconciliationTaxHolidays	(1,489,331)us-gaap_IncomeTaxReconciliationTaxHolidays
Effect of tax rate changes on deferred taxes	4,536us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	28,146us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	21,573us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Over-accrued EIT for previous years	(24,679)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(153,121)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(32,982)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(15,084)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Withholding tax on PRC subsidiaries' undistributed earnings	0us-gaap_IncomeTaxReconciliationOtherAdjustments	0us-gaap_IncomeTaxReconciliationOtherAdjustments	560,243us-gaap_IncomeTaxReconciliationOtherAdjustments	0us-gaap_IncomeTaxReconciliationOtherAdjustments
Addition to valuation allowance	67,134us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	416,539us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	293,300us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	103,217us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Taxation for the year	$ 359,599us-gaap_IncomeTaxExpenseBenefit	2,231,172us-gaap_IncomeTaxExpenseBenefit	1,828,930us-gaap_IncomeTaxExpenseBenefit	1,574,159us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	15.41%us-gaap_EffectiveIncomeTaxRateContinuingOperations	15.41%us-gaap_EffectiveIncomeTaxRateContinuingOperations	15.01%us-gaap_EffectiveIncomeTaxRateContinuingOperations	13.16%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share	$ 8.64us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare	53.61us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare	61.53us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare	42.63us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare

X

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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