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Deferred Grants - Summary of Deferred Grants (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Subclassifications of assets, liabilities and equities [Abstract]
Beginning balance	¥ 337,889	$ 53,384	¥ 360,783
Received during the year	50,095	7,915	13,639	¥ 39,558
Released to consolidated statement of profit or loss	(34,337)	(5,425)	(36,533)
Ending balance	353,647	55,874	337,889	360,783
Current (Note 28)					¥ 22,270	$ 3,519	¥ 21,939
Non-current					331,377	52,355	315,950
Total	¥ 337,889	$ 53,384	¥ 360,783	¥ 360,783	¥ 353,647	$ 55,874	¥ 337,889

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- Definition

Release of deferred grant recognised in profit or loss.

+ References

No definition available.

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- Definition

The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

+ References

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- Definition

The amount of assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Government [member]]

+ References

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- Definition

The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

+ References

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- Definition

The cash inflow from government grants, classified as investing activities. [Refer: Government [member]; Government grants]

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