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Consolidated Statements of Shareholders' Equity
¥ in Thousands, $ in Thousands
USD ($)
shares
CNY (¥)
shares
Esta/King Venture/Xiaomi
CNY (¥)
Ordinary shares
USD ($)
shares
Ordinary shares
CNY (¥)
shares
Ordinary shares
Esta/King Venture/Xiaomi
CNY (¥)
shares
Treasury stock
USD ($)
Treasury stock
CNY (¥)
Additional paid-in capital
USD ($)
Additional paid-in capital
CNY (¥)
Additional paid-in capital
Esta/King Venture/Xiaomi
CNY (¥)
Accumulated other comprehensive (loss) income
USD ($)
Accumulated other comprehensive (loss) income
CNY (¥)
Statutory reserves
USD ($)
Statutory reserves
CNY (¥)
Accumulated deficit
USD ($)
Accumulated deficit
CNY (¥)
Total 21Vianet Group, Inc. shareholders' equity
USD ($)
Total 21Vianet Group, Inc. shareholders' equity
CNY (¥)
Total 21Vianet Group, Inc. shareholders' equity
Esta/King Venture/Xiaomi
CNY (¥)
Non-controlling interest
USD ($)
Non-controlling interest
CNY (¥)
Beginning Balance (in shares) at Dec. 31, 2014 | shares       396,234,309 396,234,309                                  
Beginning balance at Dec. 31, 2014   ¥ 2,226,957     ¥ 26     ¥ (213,665)   ¥ 4,225,029     ¥ (65,754)   ¥ 52,263   ¥ (1,794,975)   ¥ 2,202,924     ¥ 24,033
Consolidated net loss   (425,648)                             (428,099)   (428,099)     2,451
Contribution by noncontrolling interest through acquisition   (8,000)               (1,963)                 (1,963)     (6,037)
Foreign exchange difference   41,518                     41,518           41,518      
Issuance of new shares for stock consideration settlement (in shares) | shares       13,098,599 13,098,599                                  
Issuance of new shares for stock consideration settlement         ¥ 1         (1)                        
Issuance of new shares (in shares) | shares           98,672,082                                
Issuance of new shares     ¥ 1,808,498     ¥ 7         ¥ 1,808,491                 ¥ 1,808,498    
Issuance of new shares for share option exercise and restricted share units vested (in shares) | shares       6,429,372 6,429,372                                  
Issuance of new shares for share option exercise and restricted share units vested   2,105               2,105                 2,105      
Settlement of stock consideration settlement by treasury stock (in shares) | shares       878,232 878,232                                  
Settlement of stock consideration settlement by treasury stock               20,523   (20,523)                        
Share based compensation   ¥ 162,346               162,346                 162,346      
Shares issued to depository bank (in shares) | shares 7,200,000 7,200,000   7,200,000 7,200,000                                  
Reclassification of contingent consideration payable upon resolution of contingencies   ¥ 214,543               214,543                 214,543      
Appropriation of statutory reserves                             10,911   (10,911)          
Appropriation of dividend   (1,034)                                       (1,034)
(Increase) Decrease in accretion of redeemable noncontrolling interests   ¥ 7,850               7,850                 7,850      
Share repurchase (in shares) | shares 0 0                                        
Share options exercised (in shares) | shares       2,454,420 2,454,420                                  
Share options exercised   ¥ 5,240               5,240                 5,240      
Restricted share units vested | shares       4,462,098 4,462,098                                  
Settlement of share options with shares held by depository bank (in shares) | shares       (6,916,518) (6,916,518)                                  
Settlement of share options with shares held by depository bank   0   $ 0 ¥ 0     0   0     0   0   0   0     0
Ending Balance (in shares) at Dec. 31, 2015 | shares       522,512,594 522,512,594                                  
Ending Balance at Dec. 31, 2015   4,034,375     ¥ 34     (193,142)   6,403,117     (24,236)   63,174   (2,233,985)   4,014,962     19,413
Consolidated net loss   (631,209)                             (633,598)   (633,598)     2,389
Contribution from noncontrolling interest in a subsidiary   4,000                                       4,000
Foreign exchange difference   142,526                     142,526           142,526      
Issuance of new shares for stock consideration settlement (in shares) | shares       10,087,476 10,087,476                                  
Issuance of new shares for stock consideration settlement         ¥ 1         (1)                        
Issuance of new shares (in shares) | shares       143,050,264 143,050,264                                  
Issuance of new shares   2,548,695     ¥ 10         2,548,685                 2,548,695      
Issuance of new shares for share option exercise and restricted share units vested (in shares) | shares       3,261,456 3,261,456                                  
Issuance of new shares for share option exercise and restricted share units vested   1,119               1,119                 1,119      
Settlement of stock consideration settlement by treasury stock (in shares) | shares       1,338,966 1,338,966                                  
Settlement of stock consideration settlement by treasury stock   536           31,250   (30,714)                 536      
Share based compensation   ¥ 90,734               90,734                 90,734      
Shares issued to depository bank (in shares) | shares 4,500,000 4,500,000   4,500,000 4,500,000                                  
Reclassification of contingent consideration payable upon resolution of contingencies   ¥ 210,000               210,000                 210,000      
Appropriation of statutory reserves                             1,448   (1,448)          
(Increase) Decrease in accretion of redeemable noncontrolling interests   ¥ (210,485)               (210,485)                 (210,485)      
Share repurchase (in shares) | shares (4,893,150) (4,893,150)   (4,893,150) (4,893,150)                                  
Share repurchase   ¥ (42,665)           (42,665)                     (42,665)      
Share options exercised (in shares) | shares       921,594 921,594                                  
Share options exercised   3,391               3,391                 3,391      
Restricted share units vested | shares       6,957,984 6,957,984                                  
Restricted share units vested   0   $ 0 ¥ 0     0   0     0   0   0   0     0
Settlement of share options with shares held by depository bank (in shares) | shares       (7,879,578) (7,879,578)                                  
Settlement of share options with shares held by depository bank   0   $ 0 ¥ 0     0   0     0   0   0   0     0
Ending Balance (in shares) at Dec. 31, 2016 | shares       679,857,606 679,857,606                                  
Ending Balance at Dec. 31, 2016   6,151,017     ¥ 45     (204,557)   9,015,846     118,290   64,622   (2,869,031)   6,125,215     25,802
Consolidated net loss   (775,748)                             (772,730)   (772,730)     (3,018)
Cumulative adjustment for changes in accounting principles   (13,425)                             (13,425)   (13,425)      
Contribution from noncontrolling interest in a subsidiary   134,633                                       134,633
Foreign exchange difference   (120,963)                     (120,963)           (120,963)      
Issuance of new shares for share option exercise and restricted share units vested (in shares) | shares       3,119,052 3,119,052                                  
Share based compensation   ¥ 105,532               105,532                 105,532      
Shares issued to depository bank (in shares) | shares 9,000,000 9,000,000   9,000,000 9,000,000                                  
Share issued to depository bank         ¥ 1         (1)                        
Appropriation of statutory reserves                             2,083   (2,083)          
Appropriation of dividend   ¥ (5,946)                                       (5,946)
Disposal of subsidiaries                             (27,969)   27,969          
(Increase) Decrease in accretion of redeemable noncontrolling interests   ¥ (141,896)               (141,896)                 (141,896)      
Share repurchase (in shares) | shares (20,690,892) (20,690,892)   (20,690,892) (20,690,892)                                  
Share repurchase   ¥ (133,126)           (133,126)                     (133,126)      
Share options exercised (in shares) | shares       332,754 332,754                                  
Share options exercised   926               926                 926      
Restricted share units vested | shares       10,576,398 10,576,398                                  
Restricted share units vested   0   $ 0 ¥ 0     0   0     0   0   0   0     0
Settlement of share options with shares held by depository bank (in shares) | shares       (10,909,152) (10,909,152)                                  
Settlement of share options with shares held by depository bank   0   $ 0 ¥ 0     0   0     0   0   0   0     0
Ending Balance (in shares) at Dec. 31, 2017 | shares       671,285,766 671,285,766                                  
Ending Balance at Dec. 31, 2017 $ 799,380 ¥ 5,201,004   $ 7 ¥ 46   $ (51,901) ¥ (337,683) $ 1,380,263 ¥ 8,980,407   $ (411) ¥ (2,673) $ 5,954 ¥ 38,736 $ (557,813) ¥ (3,629,300) $ 776,099 ¥ 5,049,533   $ 23,281 ¥ 151,471