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Commitments and Contingencies - Additional Information (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
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rental expenses	$ 4,909us-gaap_OperatingLeasesRentExpenseNet	30,461us-gaap_OperatingLeasesRentExpenseNet	17,898us-gaap_OperatingLeasesRentExpenseNet	12,038us-gaap_OperatingLeasesRentExpenseNet
Recognized liabilities related to unrecognized tax benefits	$ 3,877us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	24,058us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	29,041us-gaap_LiabilityForUncertainTaxPositionsNoncurrent

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- Definition

The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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