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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, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Present value of obligations	$ (53,314)	$ (59,984)
Fair value of plan assets	48,059	56,304
Asset (liability) on balance sheet	(5,255)	(3,680)
Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Present value of obligations	(16,239)	(16,028)
Fair value of plan assets	1,864	2,429
Asset (liability) on balance sheet	(14,375)	(13,599)
Supplemental pension plan [member]
Disclosure of defined benefit plans [line items]
Present value of obligations	(37,075)	(43,956)
Fair value of plan assets	46,195	53,875
Asset (liability) on balance sheet	$ 9,120	$ 9,919

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- 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 2018-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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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.

+ Details

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X

- 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 2018-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Details

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- Details

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