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Expenses by Nature - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of expenses [abstract]
Percentage of foreign operations utilizing U.S. dollar	26.00%	29.00%

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- Definition

Disclosure of expenses.

+ References

No definition available.

+ Details

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- Definition

Percentage of foreign operations.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration