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Related Party Balances Parent Company Only (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Amount due from related parties current |  |  |
Amount due from related parties current | $ 17,561 | ¥ 114,256 | ¥ 182,615
Amount due to related parties current | 8,557 | 55,675 | 121,928
Seller of iJoy |  |  |
Amount due from related parties current |  |  |
Amount due from related parties current | 4,017 | 26,137 | 27,748
Amount due to related parties current | 6,005 | 39,068 | 38,131
Seller of Aipu Group |  |  |
Amount due from related parties current |  |  |
Amount due from related parties current |  |  | 98,500
Amount due to related parties current |  |  | 30,000
Parent Company |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 658,707 | 4,285,743 | 3,208,620
Amount due from related parties current |  |  |
Amount due from related parties current | 4,017 | 26,137 | 97,748
Amount due to subsidiaries current | 2,707 | 17,613 | 9,732
Amount due to related parties current | 6,005 | 39,068 | 68,131
Parent Company | 21Vianet Hong Kong Entities |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 636,809 | 4,143,269 | 3,037,249
Parent Company | Hong Kong Fastweb Holdings Co., Limited ("Fastweb HK") |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 9,473 | 61,637 | 60,574
Parent Company | 21Vianet Mobile Limited ("21V Mobile") |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 7,754 | 50,453 | 72,361
Parent Company | Venture |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 3,927 | 25,549 | 27,124
Parent Company | WiFire Open Network Group Ltd |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 641 | 4,170 |
Parent Company | WiFire Group Inc. ("WiFire Group") |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 100 | 653 | 4,301
Parent Company | 21ViaNet@Xian Holding Limited ("21V Xi'an Holding") |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current |  |  | 7,011
Parent Company | Other Subsidiaries |  |  |
Amount due from subsidiaries current |  |  |
Amount due from subsidiaries current | 3 | 12 |
Amount due from related parties current |  |  |
Amount due to subsidiaries current | 3 | 18 | 19
Parent Company | Seller of iJoy |  |  |
Amount due from related parties current |  |  |
Amount due from related parties current | 4,017 | 26,137 | 27,748
Amount due to related parties current | 6,005 | 39,068 | 38,131
Parent Company | Seller of Aipu Group |  |  |
Amount due from related parties current |  |  |
Amount due from related parties current |  |  | 70,000
Amount due to related parties current |  |  | 30,000
Parent Company | Beijing 21Vianet Zhi Hui Neng Yuan System Technology Company Limited |  |  |
Amount due from related parties current |  |  |
Amount due to subsidiaries current | $ 2,704 | ¥ 17,595 | ¥ 9,713

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