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Intangible Assets, Net - Schedule of Intangible Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amount of revenue generated | $ 182,887 us-gaap_Revenues | $ 180,244 us-gaap_Revenues | $ 148,200 us-gaap_Revenues |  |
Content Copyrights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Net book value acquired from barter transactions | 1,401 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CopyrightsMember | 1,987 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CopyrightsMember |  |  |
Online game licenses [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amount of revenue generated |  |  |  | $ 27 us-gaap_Revenues / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = xnet_OnlineGameLicensesMember | $ 303 us-gaap_Revenues / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = xnet_OnlineGameLicensesMember

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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