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Additional information: condensed financial statements of the Company - Schedule of Condensed Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from financing activities      
Net (decrease) / increase in cash and cash equivalents $ 23,553 $ (152,406) $ (36,188)
Cash and cash equivalents at beginning of year 199,504 361,777 404,275
Effect of exchange rates on cash and cash equivalents 10,422 (9,867) (6,310)
Cash and cash equivalents at end of year 233,479 199,504 361,777
Xunlei Limited [Member]      
Cash flows from operating activities      
Net cash used in operating activities (25,333) (20,312) (26,069)
Cash flows from investing activities      
Net cash generated from investing activities 32,670 15,557 3,812
Cash flows from financing activities      
Net cash generated from /(used in) financing activities (301) (14,260) 4,975
Net (decrease) / increase in cash and cash equivalents 7,036 (19,015) (17,282)
Cash and cash equivalents at beginning of year 273,160 292,175 309,457
Effect of exchange rates on cash and cash equivalents 0
Cash and cash equivalents at end of year $ 280,196 $ 273,160 $ 292,175