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Intangible Assets, Net - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Continuing Operations [Member] USD ($) | Dec. 31, 2014 Continuing Operations [Member] CNY | Dec. 31, 2013 Continuing Operations [Member] CNY | Dec. 31, 2012 Continuing Operations [Member] CNY
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | $ 976 us-gaap_AmortizationOfIntangibleAssets | 6,053 us-gaap_AmortizationOfIntangibleAssets | 6,250 us-gaap_AmortizationOfIntangibleAssets | 10,203 us-gaap_AmortizationOfIntangibleAssets |  |  | $ 976 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 6,053 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 6,250 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 10,203 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Intangible assets, estimated useful lives |  |  |  |  | 1 year 9 months | 15 years |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration