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Secured or Guaranteed Bank Borrowings (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-term borrowings | $ 7,685 | ¥ 50,000 | ¥ 1,683,676
Long-term bank and other borrowings (including current portion) |  | 257,927 | 307,524
Unsecured Borrowing |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowings |  |  | 143,676
Long-term bank and other borrowings (including current portion) |  | 99,927 | 128,107
Secured by a Subsidiary's Construction-in-Progress | Long-term bank and other borrowings, (including current portion) 1 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term bank and other borrowings (including current portion) |  | 158,000 |
Secured by a Subsidiary's Construction-in-Progress | Long-term Bank and Other Borrowings (Including Current Portion) 4 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term bank and other borrowings (including current portion) |  |  | 164,000
Secured by restricted cash | Short-term bank borrowings 1 |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowings |  | ¥ 50,000 |
Secured by a subsidiary building | Long-term bank and other borrowings, (including current portion) 2 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term bank and other borrowings (including current portion) |  |  | 1,600
Secured by a subsidiary's computer and network equipment | Long-term bank and other borrowings, (including current portion) 3 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term bank and other borrowings (including current portion) |  |  | 13,817
Guaranteed by restricted cash | Short-term bank borrowings 1 |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowings |  |  | 1,520,000
Guaranteed by noncontrolling shareholder of Aipu Group | Short-term bank borrowings 2 |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowings |  |  | ¥ 20,000

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