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Earnings Per Share - Summary of Earnings Per Share (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 CNY (¥) shares
Earnings per share [abstract]
Profit attributable to ordinary equity holders of the parent	¥ 548,903	$ 84,821	¥ 604,914	¥ 695,266
Weighted average number of ordinary shares	40,858,290	40,858,290	40,858,290	40,858,290
Weighted average number of ordinary shares adjusted for effect of dilution	40,858,290	40,858,290	40,858,290	40,858,290

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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- Definition

The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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