CONSOLIDATED BALANCE SHEETS (Parenthetical)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
CNY (¥)
shares
Allowance for doubtful accounts | ¥ ¥ 62,736 ¥ 51,719
Accounts payable 624,300 611,947
Deferred revenues 2,123,755 1,845,846
Customer advances 1,365,437 1,236,076
Taxes payable 186,491 62,084
Salary and welfare payable 536,831 553,506
Accrued expenses and other current liabilities 689,134 727,904
Deferred tax liabilities 319,219 373,810
Other non-current liabilities ¥ 17,376 ¥ 69,937
Ordinary share, shares authorized | shares 5,000,000,000 5,000,000,000
Ordinary share, shares issued | shares 293,965,131 289,670,997
Ordinary share, shares outstanding | shares 293,965,131 289,670,997
Variable Interest Entities [Member]    
Accounts payable | ¥ ¥ 171,306 ¥ 199,618
Deferred revenues | ¥ 872,148 859,956
Customer advances | ¥ 288,953 296,595
Taxes payable | ¥ 53,629 14,740
Salary and welfare payable | ¥ 233,692 254,958
Accrued expenses and other current liabilities | ¥ 190,498 205,441
Deferred tax liabilities | ¥ 282,603 329,611
Other non-current liabilities | ¥ ¥ 0 ¥ 0
Class A Ordinary Shares [Member]    
Ordinary share, shares authorized | shares 4,800,000,000 4,800,000,000
Ordinary share, shares issued | shares 245,924,871 240,930,737
Ordinary share, shares outstanding | shares 245,924,871 240,930,737
Class B Ordinary Shares [Member]    
Ordinary share, shares authorized | shares 200,000,000 200,000,000
Ordinary share, shares issued | shares 48,040,260 48,740,260
Ordinary share, shares outstanding | shares 48,040,260 48,740,260