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Taxation - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 14, 2008
Mar. 16, 2007
Jan. 31, 2018
Aug. 31, 2006
Dec. 31, 2018
CNY (¥)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]                            
Profits tax rate             17.00% 17.00% 6.00% 20.00%        
Cash paid for income taxes             ¥ 145,825,000 $ 20,946 ¥ 180,233,000 ¥ 216,060,000        
Preferential statutory tax rate for high and new technology enterprises                 15.00% 15.00% 15.00% 15.00% 15.00% 15.00%
Period of full tax exemption     2 years                      
Income taxes reduction percentage     50.00%                      
Income tax reduction period     3 years                      
Significant unrecognized tax benefits         ¥ 0   0   ¥ 0          
Significant change in unrecognized tax benefits within 12 months         0   0   ¥ 0          
Provision made for dividend withholding taxes             ¥ 0              
Reversal of income tax expense         ¥ 268,051,000 ¥ 131,627,000       ¥ 136,424,000        
Tax loss carry-forward limitation period             The applicable carry-forward limitation period is 5 years under the PRC EIT law. The applicable carry-forward limitation period is 5 years under the PRC EIT law.            
Subsidiaries [Member]                            
Income Tax Disclosure [Line Items]                            
Total tax loss carry forwards             ¥ 64,655,000,000              
Earliest Tax Year [Member]                            
Income Tax Disclosure [Line Items]                            
Tax loss carry forwards, expiration year             2020 2020            
Latest Tax Year [Member]                            
Income Tax Disclosure [Line Items]                            
Tax loss carry forwards, expiration year             2024 2024            
PRC Subsidiary [Member]                            
Income Tax Disclosure [Line Items]                            
Statutory tax rate   25.00%                        
Preferential statutory tax rate for high and new technology enterprises 15.00%                          
Percentage of income tax rate for its global income             25.00% 25.00%            
Foreign investment enterprise tax withholding rate             10.00% 10.00%            
Dividend withholding tax             ¥ 0              
Micro Small Entities [Member]                            
Income Tax Disclosure [Line Items]                            
Statutory tax rate     20.00%                      
Income taxes reduction percentage     50.00%                      
Hong Kong [Member]                            
Income Tax Disclosure [Line Items]                            
Profits tax rate                   16.50% 16.50%      
Cash paid for income taxes                   ¥ 0 ¥ 0      
Estimated assessable profits tax                   ¥ 0 ¥ 0      
Hong Kong [Member] | Maximum [Member]                            
Income Tax Disclosure [Line Items]                            
Foreign investment enterprise tax withholding rate       5.00%                    
Hong Kong [Member] | PRC Subsidiary [Member] | Minimum [Member]                            
Income Tax Disclosure [Line Items]                            
Minimum foreign investor direct ownership percentage to be subject to maximum tax of 5%       25.00%