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Movement in Allowance for Doubtful Accounts (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
Allowance for Doubtful Accounts
Balance as of January 1	$ 7,062us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	43,814us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	5,768us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	5,806us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Amounts (credited against) charged to expenses	8,068us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	50,063us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	38,046us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	(38)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Balance as of December 31	$ 15,130us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	93,877us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	43,814us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	5,768us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the allowance for doubtful accounts.

+ References

No definition available.

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration