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Commitment and Contingencies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥)
Network Infrastructure and Buildings |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Capital commitments contracted not yet reflected in financial statements | $ 84,000,000 |  |  |  | ¥ 547,000,000
Office |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Total operating lease expense | 78,000,000 | ¥ 507,000,000 | ¥ 494,000,000 | ¥ 647,000,000 |
IDC Facilities |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Total operating lease expense | 854,000,000 | ¥ 5,600,000,000 | 4,700,000,000 | ¥ 3,700,000,000 |
Obligations related to the entity's directors and officers |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Fair value of indemnification obligations related to the entity's directors and officers | $ 0 |  | ¥ 0 |  | ¥ 0

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