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Hedging Derivative Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Disclosure of detailed information about hedging instruments [abstract]
Description of forward exchange contracts maturity	Maturities of 12 months or less.

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- References

No definition available.

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- Definition

Description of forward exchange contracts maturity

+ References

No definition available.

+ Details

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