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Capital Management - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of capital management [abstract]
Net debt ratio	1.16	2.38

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- Definition

Disclosure of capital management.

+ References

No definition available.

+ Details

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- Definition

Net debt to EBITDA ratio.

+ References

No definition available.

+ Details

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