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Organization - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 19, 2016 | Jan. 31, 2011 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) Entity | Dec. 31, 2017 CNY (¥) Entity | Mar. 31, 2017
Organization [Line Items] |  |  |  |  |  |
Number of additional VIEs controlled through Primary Beneficiaries | Entity |  |  |  | 2 | 2 |
Assets pledged as collateral |  |  |  | $ 48,321,000 | ¥ 335,491,000 |
Unconsolidated VIE's carrying amount of assets |  |  |  | 0 | 0 |
Unconsolidated VIE's carrying amount of liabilities |  |  |  | 0 | 0 |
Maximum exposure to loss related to arrangements with variable interest entity |  |  |  | $ 9,198,000 | ¥ 59,846,000 |
Internet Data Center Services |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Equity interest percentage by parent |  |  |  |  |  | 51.00%
Warburg Pincus |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  | 49.00%
Option Agreement |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Exclusive option price |  |  | ¥ 1,000 |  |  |
Agreement agreement between 21Vianet China and the 21Vianet Technology, term | 10 years |  | 10 years |  |  |
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date | Dec. 18, 2026 |  | Dec. 18, 2016 |  |  |
Technical Consulting and Service Agreement |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Agreement agreement between 21Vianet China and the 21Vianet Technology, term | 10 years |  | 10 years |  |  |
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date | Dec. 18, 2026 |  | Dec. 18, 2016 |  |  |
Service fee per hour |  |  | ¥ 1,000 |  |  |
Loan Agreement | Shareholders | Loan one |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Loan facility provided to related parties |  | ¥ 7,000,000 |  |  |  |
Loan Agreement | Shareholders | Loan Two |  |  |  |  |  |
Organization [Line Items] |  |  |  |  |  |
Loan facility provided to related parties |  | ¥ 3,000,000 |  |  |  |

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