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Cash and Cash Equivalents - Summary of Cash on Hand and Cash Held at Bank (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2014 RMB [Member] USD ($)	Dec. 31, 2014 RMB [Member] CNY	Dec. 31, 2013 RMB [Member] USD ($)	Dec. 31, 2013 RMB [Member] CNY	Dec. 31, 2014 USD [Member] USD ($)	Dec. 31, 2014 USD [Member] CNY	Dec. 31, 2013 USD [Member] USD ($)	Dec. 31, 2013 USD [Member] CNY	Dec. 31, 2014 HKD [Member] USD ($)	Dec. 31, 2014 HKD [Member] HKD	Dec. 31, 2013 HKD [Member] USD ($)	Dec. 31, 2013 HKD [Member] HKD
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	$ 404,275	$ 93,906	$ 81,906	$ 53,349	$ 110,149	674,001	$ 81,851	499,034	$ 294,036	294,036	$ 11,959	11,959	$ 90	697	$ 96	749

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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