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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
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Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash on hand and cash held at bank | $ 404,275 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 93,906 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 81,906 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 53,349 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 110,149 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_CNY | 674,001 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_CNY | $ 81,851 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_CNY | 499,034 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_CNY | $ 294,036 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_USD | 294,036 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_USD | $ 11,959 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_USD | 11,959 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_USD | $ 90 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_HKD | 697 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_HKD | $ 96 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_HKD | 749 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CurrencyAxis = currency_HKD

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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