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Financial instruments - Risk management and fair value- Summary of Company's financial instruments measured at fair value (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Asset held for sale | $ 135,542 | $ 120,006
Total assets | 3,853,384 | 4,357,378
Derivative financial instruments | 245,560 |
Total liabilities | 2,569,826 | $ 2,422,472
Non-recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 135,542 |
Non-recurring fair value measurement | Assets Held For Sale |  |
Disclosure of fair value measurement of assets [line items] |  |
Asset held for sale | 135,542 |
Non-recurring fair value measurement | Level 1 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Non-recurring fair value measurement | Level 1 of fair value hierarchy | Assets Held For Sale |  |
Disclosure of fair value measurement of assets [line items] |  |
Asset held for sale | 0 |
Non-recurring fair value measurement | Level 2 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Non-recurring fair value measurement | Level 2 of fair value hierarchy | Assets Held For Sale |  |
Disclosure of fair value measurement of assets [line items] |  |
Asset held for sale | 0 |
Non-recurring fair value measurement | Level 3 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 135,542 |
Non-recurring fair value measurement | Level 3 of fair value hierarchy | Assets Held For Sale |  |
Disclosure of fair value measurement of assets [line items] |  |
Asset held for sale | 135,542 |
Recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 245,560 |
Recurring fair value measurement | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Derivative financial instruments | 245,560 |
Recurring fair value measurement | Level 1 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 |
Recurring fair value measurement | Level 1 of fair value hierarchy | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Derivative financial instruments | 0 |
Recurring fair value measurement | Level 2 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 245,560 |
Recurring fair value measurement | Level 2 of fair value hierarchy | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Derivative financial instruments | 245,560 |
Recurring fair value measurement | Level 3 of fair value hierarchy |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 |
Recurring fair value measurement | Level 3 of fair value hierarchy | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Derivative financial instruments | $ 0 |

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