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Parent company only condensed financial information (Details 3)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Condensed Statements of Cash Flows        
Net cash provided by/(used in) operating activities $ (279,655) ¥ (1,811,551) ¥ 1,015,016 ¥ 3,569,819
Net cash provided by/(used in) investing activities (352,381) (2,282,652) (13,203,248) (2,671,052)
Net cash provided by financing activities 725,598 4,700,273 18,392,028 2,795,184
Effect of exchange rate changes on cash and cash equivalents 52,973 343,147 (101,484) (58,906)
Net increase in cash and cash equivalents 146,535 949,217 6,102,312 3,635,045
Cash and cash equivalents at beginning of year 2,611,171 16,914,651 10,812,339 7,177,294
Cash and cash equivalents at end of year 2,757,706 17,863,868 16,914,651 10,812,339
Parent company        
Condensed Statements of Cash Flows        
Net cash provided by/(used in) operating activities 26,092 169,018 101,150 (1,209)
Net cash provided by/(used in) investing activities 89,513 579,850 (9,069,394) (5,399,613)
Net cash provided by financing activities 11,688 75,713 17,447,655 2,720,076
Effect of exchange rate changes on cash and cash equivalents (1,672) (10,834) (363,084) (51,988)
Net increase in cash and cash equivalents 125,621 813,747 8,116,327 (2,732,734)
Cash and cash equivalents at beginning of year 1,254,871 8,128,802 12,475 2,745,209
Cash and cash equivalents at end of year $ 1,380,492 ¥ 8,942,549 ¥ 8,128,802 ¥ 12,475