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Related Party Transactions (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥)
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans from | $ 8,557 |  | ¥ 121,928 |  | ¥ 55,675
Xiaomi Communication Technology Limited | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 32,976 | ¥ 214,555 | 113,458 | ¥ 27,144 |
Beijing Kingsoft Cloud Network Technology Limited |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans from | 318 |  | 1,105 |  | 2,070
Beijing Kingsoft Cloud Network Technology Limited | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 1,237 | 8,046 | 19,471 | 7,969 |
Beijing Kingsoft Cloud Network Technology Limited | Service Expense [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | 1,195 | 7,775 | 1,045 |  |
Chengdu Xingpu Investment Management Limited | Equipment and Property |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, purchase of equipment and property |  |  |  | 37,101 |
Beijing Xiaomi Mobile Software Limited | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 854 | 5,555 | 11,689 | 275 |
Beijing Cheetah Mobile Technology Limited | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 788 | 5,128 | 9,478 | 6,712 |
Other Related Party Transactions |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans from | 240 |  | 1,454 |  | 1,561
Other Related Party Transactions | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 509 | 3,314 | 2,413 | 4,255 |
Other Related Party Transactions | Service Expense [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | 405 | 2,632 | 9,178 | 20,023 |
Dyxnet Corporate Service Limited | Service Expense [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | 987 | 6,424 | 10,883 |  |
Dyxnet Corporate Service Limited | Management Services [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense |  |  |  | ¥ 16,602 |
Beijing Chengyishidai Network Technology Company Limited |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans from | 556 |  |  |  | ¥ 3,618
Beijing Chengyishidai Network Technology Company Limited | Service Expense [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | 458 | 2,979 |  |  |
Beijing Fastweb Network Technology Co Ltd Bjfastweb |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans to | 3,074 | 20,000 |  |  |
Related party transaction, interest income from loan | 32 | 210 |  |  |
Beijing Fastweb Network Technology Co Ltd Bjfastweb | Equipment and Property |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, sales of equipment and property | 157 | 1,021 |  |  |
WNT Technology Limited | Equipment and Property |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, purchase of equipment and property | 404 | 2,629 |  |  |
Dyxnet Internet Center Limited | Equipment and Property |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, purchase of equipment and property | 190 | 1,234 | 3,079 |  |
CD Guotao |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, loans from |  |  | ¥ 3,483 |  |
WiFire (Beijing) Technology Co., Ltd. | Service Revenue |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related party transactions | 1,495 | 9,726 |  |  |
WiFire (Beijing) Technology Co., Ltd. | Service Expense [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | $ 248 | ¥ 1,616 |  |  |

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