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Discontinued Operations (Comprehensive Income Information of Discontinued Operations) (Details) - USD ($)
 12 Months Ended
Sep. 23, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Discontinued Operations [Line Items]        
Net income/(loss) from discontinued operations, net of tax   $ 864,902,000 $ (91,793,000) $ 55,108,000
Sogou [Member]        
Discontinued Operations [Line Items]        
Revenues   407,607,000 [1] 924,664,000 1,172,252,000
Cost of revenues   274,408,000 [1] 722,614,000 738,454,000
Gross profit/(loss)   133,199,000 [1] 202,050,000 433,798,000
Operating expenses:   206,841,000 [1] 325,170,000 369,363,000
Operating profit/(loss)   (73,642,000) [1] (123,120,000) 64,435,000
Interest income   2,377,000 [1] 2,807,000 4,443,000
Interest expense   (761,000) [1] 0 0
Foreign currency exchange gain/(loss)   (848,000) [1] (7,767,000) 1,849,000
Other income/(expense), net   81,655,000 [1] 38,633,000 21,127,000
Income/(loss) from discontinued operations before income tax expense   8,781,000 [1] (89,447,000) 91,854,000
Income tax expense/(benefit)   (1,112,000) [1] 2,346,000 2,748,000
Results of operations from discontinued operations, net of tax   9,893,000 [1] (91,793,000) 89,106,000
Gain on disposal of discontinued operations $ 855,000,000 855,009,000 [1] 0 0
Net income/(loss) from discontinued operations, net of tax   864,902,000 [1] (91,793,000) 89,106,000
Sogou [Member] | Research and Development Expense [Member]        
Discontinued Operations [Line Items]        
Operating expenses: [2]   141,506,000 [1] 193,376,000 190,402,000
Sogou [Member] | Sales and marketing [Member]        
Discontinued Operations [Line Items]        
Operating expenses: [2]   53,481,000 [1] 102,523,000 138,291,000
Sogou [Member] | General and administrative [Member]        
Discontinued Operations [Line Items]        
Operating expenses: [2]   $ 11,854,000 [1] 29,271,000 40,670,000
Changyou [Member]        
Discontinued Operations [Line Items]        
Gain on disposal of discontinued operations     $ 0 0
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member]        
Discontinued Operations [Line Items]        
Revenues [3]       37,323,000
Cost of revenues [3]       43,857,000
Gross profit/(loss) [3]       (6,534,000)
Operating expenses: [3]       27,390,000
Operating profit/(loss) [3]       (33,924,000)
Interest income [3]       7,000
Other income/(expense), net [3]       61,000
Income/(loss) from discontinued operations before income tax expense [3]       (33,856,000)
Income tax expense/(benefit) [3]       142,000
Net income/(loss) from discontinued operations, net of tax [3]       (33,998,000)
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member] | Sales and marketing [Member]        
Discontinued Operations [Line Items]        
Operating expenses: [3]       8,807,000
Changyou [Member] | Shanghai Jingmao Culture Communication Co., Ltd. ("Shanghai Jingmao") and its affiliate [Member] | General and administrative [Member]        
Discontinued Operations [Line Items]        
Operating expenses: [3]       $ 18,583,000
[1] Includes the financial results of the discontinued operations from January 1, 2021 to September 23, 2021.
[2] Expenses generated from marketing services among the Sohu and Sogou, and leasing expenses generated from a building that Sohu leases to Sogou are not eliminated because those expenses are considered to continue after the disposal of the discontinued operations.
[3] Includes the financial results of the discontinued operations from January 1, 2019 to August 12, 2019.