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Parent company only condensed financial information (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Operating expenses        
Marketing $ (2,292,871) ¥ (14,918,107,000) ¥ (10,158,686,000) ¥ (7,232,717,000)
General and administrative (647,801) (4,214,790,000) (3,435,878,000) (2,187,890,000)
Loss from operations (128,409) (835,476,000) (1,251,653,000) (5,357,899,000)
Interest income 388,929 2,530,490,000 1,226,852,000 673,006,000
Interest expense (148,124) (963,742,000) (618,567,000) (72,595,000)
Others, net 202,328 1,316,408,000 1,543,376,000 (145,807,000)
Net loss attributable to ordinary shareholders (23,399) (152,257,000) (3,806,790,000) (9,107,940,000)
Other comprehensive income:        
Foreign currency translation adjustments (126,347) (822,052,000) 943,616,000 954,787,000
Net change in unrealized gains/(losses) on available-for-sale securities:        
Unrealized gains/(losses), nil of tax 226,398 1,473,014,000 (78,792,000) (238,852,000)
Reclassification adjustment for (gains)/losses recorded in net income, nil of tax (54,144) (352,274,000) 123,743,000 216,230,000
Net unrealized gains/(losses) on available-for-sale securities 172,254 1,120,740,000 44,951,000 (22,622,000)
Total other comprehensive income   298,688,000 988,567,000 930,951,000
Total comprehensive income/(loss) attributable to ordinary shareholders 22,508 146,431,000 (2,818,223,000) (8,176,989,000)
Unrealized gains/(losses), tax   0 0 0
Reclassification adjustment for (gains)/losses recorded in net income, tax   0 0 0
Parent company        
Operating expenses        
Marketing (186,776) (1,215,222,000) (1,218,760,000) (1,221,580,000)
General and administrative (85,538) (556,534,000) (577,350,000) (445,095,000)
Loss from operations (272,314) (1,771,756,000) (1,796,110,000) (1,666,675,000)
Share of income/(loss) of subsidiaries, consolidated VIEs and VIEs' subsidiaries 263,924 1,717,151,000 (1,948,761,000) (7,520,216,000)
Interest income 10,274 66,848,000 55,373,000 143,757,000
Interest expense (40,077) (260,756,000) (164,910,000)  
Others, net 14,794 96,256,000 47,618,000 (64,806,000)
Net loss (23,399) (152,257,000) (3,806,790,000) (9,107,940,000)
Net loss attributable to ordinary shareholders (23,399) (152,257,000) (3,806,790,000) (9,107,940,000)
Net loss (23,399) (152,257,000) (3,806,790,000) (9,107,940,000)
Other comprehensive income:        
Foreign currency translation adjustments (126,347) (822,052,000) 943,616,000 953,573,000
Net change in unrealized gains/(losses) on available-for-sale securities:        
Unrealized gains/(losses), nil of tax 226,398 1,473,014,000 (78,792,000) (238,852,000)
Reclassification adjustment for (gains)/losses recorded in net income, nil of tax (54,144) (352,274,000) 123,743,000 216,230,000
Net unrealized gains/(losses) on available-for-sale securities 172,254 1,120,740,000 44,951,000 (22,622,000)
Total other comprehensive income 45,907 298,688,000 988,567,000 930,951,000
Total comprehensive income/(loss) attributable to ordinary shareholders $ 22,508 146,431,000 (2,818,223,000) (8,176,989,000)
Unrealized gains/(losses), tax   0 0 0
Reclassification adjustment for (gains)/losses recorded in net income, tax   ¥ 0 ¥ 0 ¥ 0