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Significant Accounting Judgments, Estimates and Assumptions - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)
Disclosure of changes in accounting estimates [line items]
Carrying amounts of deferred tax assets	¥ 422,960		¥ 361,207	$ 59,697
Increase in profit if all unrecognized deferred tax asset were recognized	¥ 162,000	$ 22,900	160,000
Cash flows derived from forecasts period	ten years	ten years
Carrying amounts of inventory provision	¥ 108,700		¥ 93,600	$ 15,300

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- Definition

Increase in profit if all unrecognized deferred tax asset were recognized

+ References

No definition available.

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- Definition

Inventory provision.

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- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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