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Restricted Net Asset - Additional Information (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Statutory Accounting Practices [Line Items] |  |  |
Statutory reserves | $ 5,954 | ¥ 38,736 | ¥ 64,622
Restricted net asset, PRC generally accepted accounting principles (in RMB) or (in dollars) | 753,321 | 4,901,334 |
PRC |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory reserves | $ 5,954 | ¥ 38,736 | ¥ 64,622
PRC | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Minimum required Percentage of annual after-tax profit to the general statutory reserve | 10.00% | 10.00% |
PRC | Maximum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Maximum requirement of each of the Entity's PRC Subsidiaries' after-tax profits to be allocated to a general reserve fund as a percentage of each Subsidiaries' registered capital | 50.00% | 50.00% |

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