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Basic and diluted net income per share (Schedule of Calculation of Basic and Diluted Net Income Per Share) (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
¥ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
¥ / shares
shares
Dec. 31, 2014
CNY (¥)
¥ / shares
shares
Numerator:        
Net income attributable to the Company ¥ 1,523,918 $ 219,491 ¥ 1,033,243 ¥ 1,064,472
Interest expenses of convertible notes | ¥ 81,085  
Numerator for diluted income per share | ¥ ¥ 1,605,003   ¥ 1,033,243 ¥ 1,064,472
Denominator:        
Denominator for basic calculation—weighted average number of Class A and Class B common shares outstanding [1] 1,127,343,312 1,127,343,312 1,125,189,978 1,153,140,699
Dilutive effect of share options 684,455 684,455 2,711,486 10,372,442
Dilutive effect of restricted shares 2,604,789
Dilutive effect of restricted share units 15,816,362 15,816,362 22,929,699 32,425,543
Dilutive effect of convertible bonds 72,267,200 72,267,200
Denominator for diluted calculation (in shares) [1] 1,216,111,329 1,216,111,329 1,150,831,163 1,198,543,473
Basic net income per share (in CNY/dollars per share) | (per share) [1] ¥ 1.35 $ 0.19 ¥ 0.92 ¥ 0.92
Diluted net income per share (in CNY/dollars per share) | (per share) [1] ¥ 1.32 $ 0.19 ¥ 0.9 ¥ 0.89
American Depository Shares [Member]        
Denominator:        
Denominator for basic calculation—weighted average number of Class A and Class B common shares outstanding [1] 56,367,166 56,367,166 56,259,499 57,657,035
Denominator for diluted calculation (in shares) [1] 60,805,566 60,805,566 57,541,558 59,927,174
Basic net income per share (in CNY/dollars per share) | (per share) [1] ¥ 27.04 $ 3.89 ¥ 18.37 ¥ 18.46
Diluted net income per share (in CNY/dollars per share) | (per share) [1] ¥ 26.4 $ 3.8 ¥ 17.96 ¥ 17.76
[1] Each ADS represents 20 Class A common shares.