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Changes in Carrying Amount of Goodwill (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
Goodwill [Roll Forward]
Balance as of January 1	$ 2,718,040us-gaap_Goodwill	16,864,350us-gaap_Goodwill	3,877,564us-gaap_Goodwill	2,419,542us-gaap_Goodwill
Goodwill acquired	89,376us-gaap_GoodwillAcquiredDuringPeriod	554,541us-gaap_GoodwillAcquiredDuringPeriod	12,986,790us-gaap_GoodwillAcquiredDuringPeriod	1,458,023us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustment	0us-gaap_GoodwillTranslationAdjustments	4us-gaap_GoodwillTranslationAdjustments	(4)us-gaap_GoodwillTranslationAdjustments	(1)us-gaap_GoodwillTranslationAdjustments
Balance as of December 31	$ 2,807,416us-gaap_Goodwill	17,418,895us-gaap_Goodwill	16,864,350us-gaap_Goodwill	3,877,564us-gaap_Goodwill

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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