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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
Jan. 01, 2017
CNY (¥)
Oct. 01, 2016
Segment
Sep. 30, 2017
CNY (¥)
Sep. 30, 2016
Segment
Jun. 30, 2014
Dec. 31, 2017
USD ($)
Segment
Reporting_unit
shares
Dec. 31, 2017
CNY (¥)
Segment
Reporting_unit
shares
Jun. 29, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2017
CNY (¥)
Dec. 29, 2017
Significant Accounting Policies [Line Items]                              
Official exchange rate of foreign currency remeasured (RMB per one U.S. dollar)                             6.5063
Impairment of investment             $ 3,114,000 ¥ 20,258,000              
Internal use software development costs, Amount capitalized             $ 1,420,000       ¥ 12,781,000   ¥ 23,780,000 ¥ 9,238,000  
Number of reporting units | Reporting_unit             1 1              
Cash flows estimated growth rate after six years using terminal value       3.00%                      
Discount rate used in the valuations based on weighted average cost of capital       13.00%     13.00%       13.00%     13.00%  
Discounted cash flow projection period       5 years           8 years 8 years        
Impairment losses pursuant to the goodwill tests       ¥ 766,000,000     $ 117,800,000 ¥ 766,440,000              
Vat rate           6.00%                  
Business tax expenses and other surcharges                   $ 0     6,394,000    
Advertising expense             $ 1,195,000 ¥ 7,773,000     ¥ 20,420,000   ¥ 26,360,000    
Estimated forfeiture rate for management and non-management employees                   1.81% 1.81% 1.10% 1.10%    
Share Repurchase Plan, shares repurchased (in shares) | shares             20,690,892 20,690,892   4,893,150 4,893,150 0 0    
Share Repurchase Plan, share value               ¥ 133,126,000     ¥ 42,665,000        
Number of reportable segments | Segment     2   1   1 1              
Accounting Standards Update 2016-09                              
Significant Accounting Policies [Line Items]                              
Cumulative-effect adjustment to retained earnings $ 2,058,000 ¥ 13,425,000                          
Aipu Group                              
Significant Accounting Policies [Line Items]                              
Discounted cash flow projection period             7 years 7 years              
Long-lived assets impairment               ¥ 170,695,000              
WiFire Group Inc. ("WiFire Group")                              
Significant Accounting Policies [Line Items]                              
Discounted cash flow projection period             5 years 5 years              
Long-lived assets impairment               ¥ 231,113,000              
Short-term investments                              
Significant Accounting Policies [Line Items]                              
Impairment of investment | $             $ 0     $ 0   $ 0      
Option Three                              
Significant Accounting Policies [Line Items]                              
Business tax rate                       3.00% 3.00%    
Option Four                              
Significant Accounting Policies [Line Items]                              
Business tax rate                       5.00% 5.00%    
Deferred Tax Assets Current | Accounting Standards Update 2015-17 [Member]                              
Significant Accounting Policies [Line Items]                              
Reclassification of current deferred tax assets to noncurrent deferred tax assets                     (43,000,000)        
Deferred Tax Assets Noncurrent | Accounting Standards Update 2015-17 [Member]                              
Significant Accounting Policies [Line Items]                              
Reclassification of current deferred tax assets to noncurrent deferred tax assets                     ¥ 43,000,000        
American Depository Shares                              
Significant Accounting Policies [Line Items]                              
Share Repurchase Plan, period                 12 months            
Share Repurchase Plan, shares repurchased (in shares) | shares             3,448,482 3,448,482   815,525 815,525 0 0    
Share Repurchase Plan, share value             $ 20,461,000 ¥ 133,126,000     ¥ 42,665,000   ¥ 0    
Master Services Agreement                              
Significant Accounting Policies [Line Items]                              
Master service agreement terms             1 year 1 year              
Maximum | American Depository Shares                              
Significant Accounting Policies [Line Items]                              
Share Repurchase Plan, value | $                 $ 200,000,000            
Minimum | Capital Leases                              
Significant Accounting Policies [Line Items]                              
Capital lease recognition condition, lease term as a percentage of estimated remaining economic life             75.00% 75.00%              
Capital lease recognition condition, minimum lease payments at the beginning of the lease term as a percentage of the fair value of the leased property             90.00% 90.00%