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Taxation - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended | 24 Months Ended | 120 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2016 | Oct. 31, 2015 | Apr. 30, 2011 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2017 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  | 25.00% | 25.00% | 25.00% | 25.00% |  |  |  |  |  |  |  |
Undistributed earnings from its PRC subsidiaries |  |  |  | $ 126,722 |  |  |  |  |  |  | $ 126,722 |  |  | $ 126,722 | ¥ 824,493
Unrecognized tax benefits |  |  |  | $ 2,538 |  | ¥ 28,689 |  |  |  |  | $ 2,538 |  |  | $ 2,538 | 16,511
Unrecognized tax benefits impact in the effective rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,513
Shanghai Blue Cloud Technology Co., Ltd. ("SH Blue Cloud") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferential tax rate |  | 15.00% |  | 15.00% | 15.00% | 15.00% | 15.00% |  |  |  |  |  |  |  |
Preferential tax rate, additional term |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Shenzhen Diyixian Telecommunication Co., Ltd. ("SZ DYX") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferential tax rate | 15.00% |  |  | 15.00% | 15.00% | 15.00% |  |  |  |  |  |  |  |  |
Preferential tax rate, additional term | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing 21ViaNet Broadband Data Center Co., Ltd ("21Vianet Beijing") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferential tax rate |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |  |  |  |  |  |  | 15.00% |
21Vianet (Xi'an) Information Outsourcing Industry Park Services Co., Ltd. ("Xi'an Sub") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferential tax rate |  |  | 15.00% | 25.00% | 25.00% | 25.00% | 15.00% |  |  |  |  |  |  |  |
Beijing iJoy Information Technology Co., Ltd. ("BJ iJoy") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax holiday, exemption rate |  |  |  |  |  | 50.00% | 50.00% |  |  |  | 50.00% | 100.00% | 100.00% |  |
Tax holiday reduction period |  |  |  |  |  |  | 3 years |  |  |  |  | 2 years |  |  |
TAIWAN | DYX Taiwan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  |  | 17.00% | 17.00% | 17.00% | 17.00% |  |  |  |  |  |  |  |
PRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unified enterprise income tax rate |  |  |  |  |  |  |  | 25.00% | 25.00% | 25.00% |  |  |  |  |
Income tax rate on PRC tax resident enterprises |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |
Net tax operating losses from PRC subsidiaries (in RMB) |  |  |  | $ 75,965 |  |  |  |  |  |  | $ 75,965 |  |  | $ 75,965 | 494,250
Interest expense (in RMB) |  |  |  | 104 | ¥ 674 | ¥ 2,779 | ¥ (1,082) |  |  |  |  |  |  |  |
Accumulated interest expense (in RMB) |  |  |  | $ 757 |  | ¥ 5,469 |  |  |  |  | $ 757 |  |  | $ 757 | ¥ 4,929
PRC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net tax operating losses expiration year |  |  |  | 2018 | 2018 |  |  |  |  |  |  |  |  |  |
PRC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net tax operating losses expiration year |  |  |  | 2022 | 2022 |  |  |  |  |  |  |  |  |  |
HONG KONG | 21Vianet Hong Kong Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  |  | 16.50% | 16.50% | 16.50% | 16.50% |  |  |  |  |  |  |  |

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