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Financial risk management and derivative financial instruments - Summary of Covenant Tests Which Are Calculated On a Frozen GAAP Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Detailed Information About Covenant Tests Which Are Calculated On A Frozen GAAP Basis [Line Items] |  |  |
Covenant net debt | $ 2,529,000 | $ 2,665,000 | $ 1,965,000
Frozen GAAP Basis [member] |  |  |
Disclosure Of Detailed Information About Covenant Tests Which Are Calculated On A Frozen GAAP Basis [Line Items] |  |  |
Covenant EBITDA | 272,000 | 897,000 |
Covenant net debt | 2,375,000 | 2,241,000 |
Covenant interest payable | 111,000 | 99,000 |
Leverage | 8,730 | 2,500 |
Interest cover | 2,450 | $ 9,060 |
Liquidity | $ 2,925,000 |  |

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