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Commitments and Contingencies - Additional Information (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2014
Capital Addition Purchase Commitments [Member]
USD ($)
Dec. 31, 2014
Capital Addition Purchase Commitments [Member]
CNY
Long-term Purchase Commitment [Line Items]            
Rental expenses $ 2,218us-gaap_OperatingLeasesRentExpenseNet 13,764us-gaap_OperatingLeasesRentExpenseNet 10,330us-gaap_OperatingLeasesRentExpenseNet 8,986us-gaap_OperatingLeasesRentExpenseNet    
Commitments to purchase certain medical equipment         4,942us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
30,663us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_CapitalAdditionsMember
Purchase commitments period         1 year 1 year
Unrecognized tax positions $ 5,901us-gaap_LiabilityForUncertainTaxPositionsCurrent 36,616us-gaap_LiabilityForUncertainTaxPositionsCurrent