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Fair value measurement- Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets and liabilities [line items]
Transfers between Level 1 and Level 2 fair value measurements	$ 0
Transfers into Level 3 of fair value measurements	0
Transfers out of Level 3 of fair value measurements	$ 0
Interest rate used to discount cash flows relating to finance lease obligations	7.10%	6.90%
Decrease in discount rate	10.00%
Increase in fair value of contingent consideration payable	$ 8,000,000
Unquoted equity investments [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Average price earnings ratio for a competitor group	19.9	30.7
Non-marketability factor	30.00%	30.00%
Sensitivity analysis increase in average price earnings ratio in fair value of investments	$ 2,000,000	$ 2,000,000
Sensitivity analysis decrease in average price earnings ratio in fair value of investments	$ 2,000,000	$ 2,000,000
Sensitivity analysis increase in price-earnings ratio	10.00%	10.00%
Sensitivity analysis decrease in price-earnings ratio	10.00%	10.00%
Sensitivity analysis increase in net assets fair value of investments	$ 8,000,000	$ 7,000,000
Sensitivity analysis decrease in net assets fair value of investments	$ 8,000,000	$ 7,000,000
Sensitivity analysis increase in net assets percentage	10.00%	10.00%
Sensitivity analysis decrease in net assets percentage	10.00%	10.00%

X

- Definition

The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iv&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_c&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iv&doctype=Standard
-URIDate 2018-03-16

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- Definition

Average price earnings ratio for a competitor group.

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- Definition

Contingent consideration payable discount rate.

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- Definition

Decrease in fair value of investments based on sensitivity of net assets fair value measurement.

+ References

No definition available.

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- Definition

Decrease in financial assets based on sensitivity of fair value measurement to changes in unobservable inputs.

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- Definition

Decrease in percentage of sensitivity of fair value measurement to changes in unobservable inputs assets.

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- Definition

Increase in fair value of contingent consideration due to change in discount rate.

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- Definition

Increase in fair value of investments based on sensitivity of net assets fair value measurement.

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Increase in financial assets based on sensitivity of fair value measurement to changes in unobservable inputs.

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Increase in percentage of sensitivity of fair value measurement to changes in unobservable inputs assets.

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- Definition

Interest rate used to discount cash flows on finance lease obligations.

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- Definition

Percentage of price earnings non-marketability factor.

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- Definition

Percentage of decrease in fair value of investments based on sensitivity of net assets fair value measurement.

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Percentage of increase in fair value of investments based on sensitivity of net assets fair value measurement.

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