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Risk Management Activities - Market Risk - Foreign Currency - Additional Information (Detail) | 1 Months Ended
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Dec. 31, 2018 USD ($) | Oct. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 31, 2018 USD ($)
Disclosure Of Financial Risk Management [line items] |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | $ 1,290,000,000 |  |  |  |
Currency risk [member] |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |
Exposure to risk relating to financial instruments | $ 0 |  |  |  |
Average strike rate | 0.715 | 0.7075 | 0.7182 | 0.7330 | 0.7517
Currency risk [member] | Forward contract [member] |  |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |  |
Forwards notional value for the period January 2019 to December 2019 | $ 50,000,000 | $ 60,000,000 | $ 100,000,000 | $ 60,000,000 | $ 96,000,000
Mark to Market value | $ 8,700,000 |  |  |  |

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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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