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Post-Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Multi-employer defined benefit plans [member] | Medical benefits plan subsidiaries abroad [member]
Disclosure of summary of retirement benefit plans other benefits post retirement [line items]
Defined contribution pension plan by employer	$ 14.1	$ 22.2

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- Definition

Disclosure Of Summary Of Retirement Benefit Plans Other Benefits Post Retirement [line items]

+ References

No definition available.

+ Details

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- Definition

The amount of employer contributions to retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2018-03-01&anchor=para_35_b_i&doctype=Standard
-URIDate 2018-03-16

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- Details

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- Details

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