Cash and Cash Equivalents - Summary of Cash on Hand and Cash Held at Bank (Detail)
¥ in Thousands, HKD in Thousands, $ in Thousands
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
HKD
Dec. 31, 2014
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
HKD
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank   $ 361,777     $ 404,275   $ 93,906 $ 81,906
RMB [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank ¥ 606,845 93,454   ¥ 674,001 110,149      
USD [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank   268,198     294,036      
HKD [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank   $ 125 HKD 969   $ 90 HKD 697