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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