Taxation (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Income before Income/(Loss) Tax Expenses

The Group had minimal operations in jurisdictions other than the PRC. Income/(loss) before income tax expense consists of:

 

     Year ended December 31,  
     2015      2016      2017  
     RMB      RMB      RMB      US$  

PRC

      1,292,104        1,263,223        2,266,075        348,289  

Non PRC

      (15,913 )       (14,371 )       (4,534 )       (697 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  
     1,276,191        1,248,852        2,261,541        347,592  
  

 

 

     

 

 

     

 

 

     

 

 

  
Income Tax Expense

The income tax expense is comprised of:

 

     Year ended December 31,  
     2015      2016      2017  
     RMB      RMB      RMB      US$  

Current

      292,017        136,429        254,803        39,163  

Deferred

      (6,475 )       (103,800 )       12,279        1,887  
  

 

 

     

 

 

     

 

 

     

 

 

  
     285,542        32,629        267,082        41,050  
  

 

 

     

 

 

     

 

 

     

 

 

  
Reconciliation of Income Tax Expense

The reconciliation of income tax expense for the years ended December 31, 2015, 2016 and 2017 is as follows:

 

     Year ended December 31,  
     2015      2016      2017  
     RMB      RMB      RMB      US$  

Income before income tax expense

      1,276,191        1,248,852        2,261,541        347,592  

Income tax expense computed at applicable tax rates (25%)

      319,047        312,213        565,385        86,898  

Non-deductible expenses

      16,372        25,798        32,417        4,983  

Change in valuation allowances

      16,054        47,006        (15,510 )       (2,384 ) 

Outside basis difference

      (17,329 )       (28,265 )       7,360        1,131  

Effect of international tax rate difference

      3,978        3,593        1,133        174  

Interest expense relating to unrecognized tax benefits

      3,809        2,482        —          —    

Effect of preferential tax rate

      (56,389 )       (330,198 )       (383,039 )       (58,872 ) 

Effect of withholding tax

      —          —          59,336        9,120  
  

 

 

     

 

 

     

 

 

     

 

 

  

Income tax expense

      285,542        32,629        267,082        41,050  
  

 

 

     

 

 

     

 

 

     

 

 

  
Components of Deferred Taxes

The significant components of deferred taxes are as follows:

 

     December 31,  
     2016      2017  
     RMB      RMB      US$  

Deferred tax assets

         

Allowance for doubtful accounts

      7,066        352        53  

Accrued staff cost

      3,166        1,563        240  

Accrued expenses

      52,497        73,500        11,297  

Revenue recognition

      42,062        48,774        7,497  

Tax losses

      83,941        101,746        15,638  

VAT refund

      3,598        3,842        591  

Less: Valuation allowances

      (70,667 )       (55,157 )       (8,477 ) 
  

 

 

     

 

 

     

 

 

  

Total deferred tax assets

      121,663        174,620        26,839  
  

 

 

     

 

 

     

 

 

  

Deferred tax liabilities

         

Intangible assets and internally-developed software

      8,690        14,262        2,192  

Outside basis difference

      453,106        423,989        65,166  
  

 

 

     

 

 

     

 

 

  

Total deferred tax liabilities

      461,796        438,251        67,358  
  

 

 

     

 

 

     

 

 

  
Schedule of Unrecognized Tax Benefits

A roll-forward of unrecognized tax benefits is as follows:

 

     December 31,  
     2016      2017  
     RMB      RMB      US$  

Beginning balance

      22,003        21,902        3,366  

Additions based on tax positions related to current year

      —        —        —  

Decreases based on tax positions related to prior years

      (101 )       (2,855 )       (439 ) 
  

 

 

     

 

 

     

 

 

  

Ending balance

      21,902        19,047        2,927