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Earning Per Share - Summary of Earnings Per Share (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 CNY (¥) shares
Earnings per share [Abstract]
Profit attributable to ordinary equity holders of the parent	¥ 953,922	$ 150,713	¥ 515,737	¥ 341,108
Weighted average number of ordinary shares for basic earnings per share calculations	40,764,569	40,764,569	40,016,808	38,712,282
Diluted effect of share options	0	0	0	0
Weighted average number of ordinary shares adjusted for effect of dilution	40,764,569	40,764,569	40,016,808	38,712,282

X

- 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]]

+ References

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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

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- Definition

The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

+ References

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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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