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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