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Subsequent Events - Additional Information (Detail) | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 1 Months Ended
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Nov. 30, 2014 | Dec. 31, 2014 11.2 Capital I, L.P [Member] | Dec. 31, 2014 Suzhou Heidisi Network Technology Co., Ltd [Member] | Jan. 31, 2015 Subsequent Event [Member] | Jan. 31, 2015 Subsequent Event [Member] 11.2 Capital I, L.P [Member] USD ($) | Feb. 28, 2015 Subsequent Event [Member] Suzhou Heidisi Network Technology Co., Ltd [Member] USD ($) | Mar. 31, 2015 Subsequent Event [Member] Xiamen Diensi Network Technology Co., Ltd [Member] USD ($) | Mar. 31, 2015 Subsequent Event [Member] Shenzhen Xunlei Kankan Information Technologies Co., Ltd. [Member] CNY | Mar. 31, 2015 Subsequent Event [Member] Shenzhen Xunlei Kankan Information Technologies Co., Ltd. [Member] | Mar. 31, 2015 Subsequent Event [Member] Nesound International Media Corp., Ltd [Member] CNY | Apr. 20, 2015 Subsequent Event [Member] Nesound International Media Corp., Ltd [Member] CNY | Mar. 31, 2015 Subsequent Event [Member] Nesound International Media Corp., Ltd [Member] Shenzhen Xunlei Kankan Information Technologies Co., Ltd. [Member] CNY | Mar. 31, 2015 Subsequent Event [Member] Restricted shares [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted to employees |  |  |  |  |  |  |  |  |  |  |  |  | 1,769,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common stock issued for future exercise of share options or vesting of restricted shares | 10,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  | 10,991,120 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |
Consideration paid for acquired equity interests |  |  |  |  | $ 1,000,000 us-gaap_EquityMethodInvestmentAggregateCost / dei_LegalEntityAxis = xnet_ElevenPointTwoCapitalOneLpMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 647,000 us-gaap_EquityMethodInvestmentAggregateCost / dei_LegalEntityAxis = xnet_SuzhouHeidisiNetworkTechnologyCompanyLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 2,000,000 us-gaap_EquityMethodInvestmentAggregateCost / dei_LegalEntityAxis = xnet_XiamenDiensiNetworkTechnologyCompanyLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Percentage of acquired equity interests |  |  |  |  | 2.24%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = xnet_ElevenPointTwoCapitalOneLpMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 19.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = xnet_SuzhouHeidisiNetworkTechnologyCompanyLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = xnet_XiamenDiensiNetworkTechnologyCompanyLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = xnet_ShenzhenXunleiKankanInformationTechnologiesCoLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Closing date of acquisition |  | Jan. 15, 2015 | Mar. 11, 2015 |  |  |  |  |  |  |  |  |  |
Partial consideration paid for acquired equity interest |  |  |  |  |  |  | 1,200,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = xnet_XiamenDiensiNetworkTechnologyCompanyLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Cash consideration from disposal of business |  |  |  |  |  |  |  | 130,000,000 us-gaap_EquityMethodInvestmentSoldCarryingAmount / dei_LegalEntityAxis = xnet_ShenzhenXunleiKankanInformationTechnologiesCoLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |
Deposit |  |  |  |  |  |  |  |  |  |  | 26,000,000 us-gaap_RelatedPartyDepositLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xnet_NesoundInternationalMediaCorporationLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Amount of penalty liable to pay |  |  |  |  |  |  |  |  |  |  |  | 52,000,000 xnet_PurchaseAgreementContingentPenaltyPayment / dei_LegalEntityAxis = xnet_ShenzhenXunleiKankanInformationTechnologiesCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xnet_NesoundInternationalMediaCorporationLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Repayment of deposits |  |  |  |  |  |  |  |  |  | 26,000,000 xnet_RepaymentOfDepositToRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xnet_NesoundInternationalMediaCorporationLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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