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Parent company only condensed financial information (Details 3)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Condensed Statements of Cash Flows        
Net cash provided by/(used in) operating activities $ 1,262,713 ¥ 8,767,017 ¥ 1,696,322 ¥ 1,289,901
Cash flows from investing activities:        
Purchase of short-term investments (2,444,075) (16,969,213) (5,022,000) (19,104,408)
Maturity of short-term investments 1,834,722 12,738,475 16,625,621 7,853,607
Purchases of investment securities (160,766) (1,116,200) (1,139,386) (421,133)
Cash received from disposal of investment securities 52,123 361,893    
Prepayments and investments in subsidiaries, VIEs and VIEs' subsidiaries (1,103,343) (7,660,513) (7,156,789) (434,585)
Cash received from business combination, net of cash acquired (88,701) (615,849) (290,339) 1,260,337
Net cash used in investing activities (6,952,121) (48,268,577) (5,790,525) (13,478,133)
Cash flows from financing activities:        
Proceeds from issuance of ordinary shares, net       17,447,653
Repurchase of ordinary shares (768,871) (5,338,274)    
Purchase of capped call options (289,083) (2,007,100)    
Proceeds from settlement of capped call options 210,747 1,463,218    
Proceeds from issuance of ordinary shares pursuant to stock plans 11,867 82,396 75,713  
Proceeds from unsecured senior notes, net of discount and debt issuance costs 915,450 6,355,969    
Net cash provided by financing activities 5,861,943 40,699,471 4,700,273 18,392,028
Effect of exchange rate changes on cash and cash equivalents 102,249 709,916 343,147 (101,484)
Net increase in cash and cash equivalents 274,784 1,907,827 949,217 6,102,312
Cash and cash equivalents at beginning of year 2,572,932 17,863,868 16,914,651 10,812,339
Cash and cash equivalents at end of year 2,847,716 19,771,695 17,863,868 16,914,651
Parent company        
Condensed Statements of Cash Flows        
Net cash provided by/(used in) operating activities (4,861) (33,756) 169,018 101,150
Cash flows from investing activities:        
Purchase of short-term investments       (6,119,000)
Maturity of short-term investments     6,367,600  
Purchases of investment securities     (92,090)  
Cash received from disposal of investment securities 2,368 16,440    
Prepayments and investments in subsidiaries, VIEs and VIEs' subsidiaries (537,804) (3,733,972) (5,695,660) (4,264,147)
Cash received from business combination, net of cash acquired       1,313,753
Net cash used in investing activities (535,436) (3,717,532) 579,850 (9,069,394)
Cash flows from financing activities:        
Proceeds from issuance of ordinary shares, net       17,447,653
Repurchase of ordinary shares (768,871) (5,338,274)    
Purchase of capped call options (289,083) (2,007,100)    
Proceeds from settlement of capped call options 210,747 1,463,218    
Proceeds from issuance of ordinary shares pursuant to stock plans 11,867 82,396 75,713  
Proceeds from unsecured senior notes, net of discount and debt issuance costs 915,450 6,355,969    
Net cash provided by financing activities 80,110 556,209 75,713 17,447,653
Effect of exchange rate changes on cash and cash equivalents 53,162 369,104 (10,834) (363,082)
Net increase in cash and cash equivalents (407,025) (2,825,975) 813,747 8,116,327
Cash and cash equivalents at beginning of year 1,287,995 8,942,549 8,128,802 12,475
Cash and cash equivalents at end of year $ 880,970 ¥ 6,116,574 ¥ 8,942,549 ¥ 8,128,802