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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% |  |

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