Operating Lease Agreement - Summary of Future Minimum Rental Payments Under Non concealable Leases (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Future Minimum Payment Under Non Cancellable Leases [Line Items]
Future minimum rental payments	$ 51,350,000	$ 44,413,000	$ 6,597,000
Not later than 1 year [Member]
Disclosure Of Future Minimum Payment Under Non Cancellable Leases [Line Items]
Future minimum rental payments	13,018,000	10,022,000	1,223,000
Between 1 and 5 years [Member]
Disclosure Of Future Minimum Payment Under Non Cancellable Leases [Line Items]
Future minimum rental payments	24,106,000	28,193,000	$ 5,374,000
More than 5 years [Member]
Disclosure Of Future Minimum Payment Under Non Cancellable Leases [Line Items]
Future minimum rental payments	$ 14,226,000	$ 6,198,000

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2016-01-13
-Paragraph 35
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2016-03-30&anchor=para_35_a&doctype=Standard
-URIDate 2016-03-31

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant