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Disposal of WiFire Entities and Aipu Group - Additional Information (Detail)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2017
CNY (¥)
Subsidiary
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of wholly owned subsidiaries | Subsidiary 6    
Impairment losses of long-lived assets   $ 61,757 ¥ 401,808
Impairment losses of goodwill ¥ 766,000 117,800 766,440
Gain on disposal of subsidiaries   $ 76,393 ¥ 497,036
WiFire Group Inc. ("WiFire Group")      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity interest transferred 66.67%    
Consideration price ¥ 6    
Equity interest 33.33%    
Aipu Group      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration price ¥ 1    
Number of shares transferred | shares 2    
Ownership percentage before transaction 50.00%    
Description of ownership after transfer of shares The Company’s ownership in SC Aipu changed from 50% equity interest plus one share to 50% equity interest minus one share and lost control.    
Tibet Xingtao Culture Communications Co., Ltd. [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity interest transferred   50.00% 50.00%
Consideration price     ¥ 1