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Defined Benefit Plans - Summary of Amounts Recognised in the Balance Sheet for All Pension Plans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Present value of obligations	$ 59,984	$ 50,622
Fair value of plan assets	(56,304)	(51,360)
Liability (asset) on balance sheet	3,680	(738)
Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Present value of obligations	16,028	12,936
Fair value of plan assets	(2,429)	(2,054)
Liability (asset) on balance sheet	13,599	10,882
Supplemental pension plan [member]
Disclosure of defined benefit plans [line items]
Present value of obligations	43,956	37,686
Fair value of plan assets	(53,875)	(49,306)
Liability (asset) on balance sheet	$ (9,919)	$ (11,620)

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2017-01-01
-Paragraph 57
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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