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Mainland China Employee Contribution Plan - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
PRC |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Total expense for defined contribution plan | $ 20,604 | ¥ 134,053 | ¥ 130,630 | ¥ 89,571

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The contributions made by the employers to the PRC government-mandated multiemployer defined contribution plan. + References No definition available. + Details
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- Details
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