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Income Tax Expense - Classification of the Group's Net Deferred Tax Assets (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)		Jan. 01, 2017 CNY (¥)	[1]
Deferred tax assets and liabilities [abstract]
Deferred tax assets	$ 53,991	¥ 361,207	¥ 315,390	[1]	¥ 282,212
Deferred tax liabilities	(20,437)	(136,728)	(116,468)	[1]	¥ (115,758)
Net deferred tax assets	$ 33,554	¥ 224,479	¥ 198,922
[1] Restated

X

- 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]]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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