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