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Mainland China Employee Contribution Plan - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	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.

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No definition available.

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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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