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Restricted Cash - Additional Information (Detail)
In Thousands, unless otherwise specified
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Cash and Cash Equivalents [Abstract]      
Current and non-current restricted cash $ 80,935us-gaap_RestrictedCashAndCashEquivalents 502,168us-gaap_RestrictedCashAndCashEquivalents 422,140us-gaap_RestrictedCashAndCashEquivalents