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Goodwill and Intangible Assets - Additional Information (Detail) In Millions, 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
Amortization Of Intangible Assets Disclosure [Abstract] |  |  |  |
Impairment loss on intangible assets | $ 0.26 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 1.63 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 4.62 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Amortization expense of intangible assets | $ 255.48 us-gaap_AmortizationOfIntangibleAssets | 1,590.00 us-gaap_AmortizationOfIntangibleAssets | 949.85 us-gaap_AmortizationOfIntangibleAssets | 234.00 us-gaap_AmortizationOfIntangibleAssets

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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
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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