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Defined benefit plans - Summary of Defined Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income statement charge for:
Defined benefit pension plan expense	$ 3,555	$ 3,451
Actuarial losses recognised in the statement of other comprehensive income in the period (before tax)	(1,197)	(3,121)
Cumulative actuarial losses recognised in the statement of other comprehensive income (before tax)	(19,838)	(18,641)
Defined Benefit Pension Plans [member]
Income statement charge for:
Defined benefit pension plan expense	3,463	2,841
Supplemental pension plan [member]
Income statement charge for:
Defined benefit pension plan expense	$ 92	$ 610

X

- Definition

Cumulative amount of actuarial losses (gains) recognized in comprehensive income.

+ References

No definition available.

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- References

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- Definition

The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income, before tax; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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