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Long-term debt - Schedule of Long-term debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 13, 2019
Dec. 31, 2018
Debt Disclosure [Line Items]      
Total principal long-term debt $ 4,203,000   $ 2,960,000
Debt issuance costs (26,873)   (15,458)
Other (fair market value adjustments and discounts) 3,118   (76)
Total long-term debt 4,179,245   2,944,466
Unsecured floating rate term loan due quarterly through June 2020      
Debt Disclosure [Line Items]      
Total principal long-term debt 20,000   60,000
Unsecured floating rate term loan due quarterly through September 2020      
Debt Disclosure [Line Items]      
Total principal long-term debt 105,000   165,000
Unsecured notes bearing fixed rate interest at 5.125% paid October 2019      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 0   320,000
Interest rate stated percentage 5.125%    
Unsecured notes bearing fixed rate interest at 5.125% due July 2020      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 310,000   600,000
Interest rate stated percentage 5.125%    
Unsecured notes bearing fixed rate interest at 4.875% due September 2021      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 350,000   350,000
Interest rate stated percentage 4.875%    
Unsecured notes bearing fixed rate interest at 6.375% due October 2023      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 650,000   650,000
Interest rate stated percentage 6.375%    
Borrowings under revolving credit facility expiring August 2024      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 903,000   50,000
Unsecured notes bearing fixed rate interest at 5.50% due September 2024      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 325,000   325,000
Interest rate stated percentage 5.50%    
Unsecured notes bearing fixed rate interest at 7.75% due June 2027      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 200,000   200,000
Interest rate stated percentage 7.75%    
Unsecured notes bearing fixed rate interest at 7.25% due September 2027      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 240,000   240,000
Interest rate stated percentage 7.25%    
Unsecured notes bearing fixed rate interest at 5.00% due September 2029      
Debt Disclosure [Line Items]      
Total principal long-term debt $ 1,100,000 $ 1,100,000 $ 0
Interest rate stated percentage 5.00%