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Property, Plant and Equipment - Additional Information (Details) $ in Millions			3 Months Ended		12 Months Ended
	Jul. 23, 2015 CAD ($)	Jul. 23, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Property, plant and equipment [abstract]
Impairment			$ 0	$ 0		$ 21,200,000	$ 12,200,000
Deposit on anticipated sale of real property	$ 15	$ 11,200,000			$ 0	$ 0	$ 11,200,000

X

- Definition

Proceeds From Sale of Property, Related Party Transactions

+ References

No definition available.

+ Details

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X

- Definition

The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 126
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_a&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 129
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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