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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 $ 404,275us-gaap_CashAndCashEquivalentsAtCarryingValue $ 93,906us-gaap_CashAndCashEquivalentsAtCarryingValue $ 81,906us-gaap_CashAndCashEquivalentsAtCarryingValue $ 53,349us-gaap_CashAndCashEquivalentsAtCarryingValue $ 110,149us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_CNY
674,001us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_CNY
$ 81,851us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_CNY
499,034us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_CNY
$ 294,036us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_USD
294,036us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_USD
$ 11,959us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_USD
11,959us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_USD
$ 90us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_HKD
697us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_HKD
$ 96us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_HKD
749us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CurrencyAxis
= currency_HKD