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Commitments and contingencies - Narrative (Details) $ in Thousands, t in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) agreement t | Dec. 31, 2016 USD ($)
Commitments And Contingencies [Abstract] |  |
Operating lease payments recognized as expense | $ | $ 181,400 | $ 165,100
Delivery of vessels currently under construction |  |
Disclosure of associates [line items] |  |
Number of time charter agreements | agreement | 2 |
Future minimum lease payments | $ | $ 80,000 |
Lease term | 15 years |
Within one year |  |
Disclosure of associates [line items] |  |
Future minimum lease payments | $ | $ 90,820 |
Purchase commitment of methanol supply | Within one year |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 0.8 |
Purchase commitment of methanol supply | Thereafter |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 1.5 |
Atlas Joint Venture |  |
Disclosure of associates [line items] |  |
Percentage of marketing rights in production | 100.00% |
Percentage of ownership interest in associates | 63.10% | 63.10%
Atlas Joint Venture | Purchase commitment of methanol supply |  |
Disclosure of associates [line items] |  |
Purchase commitments (in tonnes) | t | 1.3 |
Atlas Joint Venture | Trinidad |  |
Disclosure of associates [line items] |  |
Percentage of ownership interest in associates | 63.10% |
Atlas Joint Venture | Egypt |  |
Disclosure of associates [line items] |  |
Percentage of ownership interest in associates | 50.00% |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The portion of operating lease payments 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 any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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