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Long-term debt - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 26, 2021 | Jun. 09, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Weighted average effective interest rate at quarter end |  |  | 3.34% | 3.34% |
Weighted average effective interest rate during quarter |  |  | 3.34% | 3.26% |
Percentage of debt instruments bearing fixed interest rate |  |  | 51.00% | 51.00% |
Senior Notes Four Point Six Two Five Percent Due Twenty Thirty |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional Debt Principal Amount Due To New Agreement | $ 1,000,000 |  |  |  |
Debt Instrument Offering Price Percentage Of Face Amount | 101.75% |  |  |  |
Debt Instrument, Maturity Date | Jun. 01, 2030 |  |  | Jun. 01, 2030 |
Senior Notes |  | $ 1,750,000 | $ 2,750,000 | $ 2,750,000 | $ 1,750,000
Debt Instrument related fees, discounts, and other professional expenses |  |  | 9,091 | $ 9,091 |
Weighted average effective interest rate during quarter |  | 4.625% |  | 4.625% |
Revolving line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Aug. 12, 2024 |
Maximum borrowing capacity on the revolving credit facilities |  |  | 1,000,000 | $ 1,000,000 |
Letter of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding |  |  | 0 | 0 |
Bilateral Secured Letter Of Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding |  |  | 69,185 | 69,185 |
Term Loan A |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  | $ 65,625 |
Debt Instrument, Maturity Date |  |  |  | Aug. 12, 2024 |
Secured Debt Outstanding Principal Balance Subject To LIBOR |  |  | $ 813,870 | $ 813,870 |
Term Loan B-1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  | $ 20,574 |
Debt Instrument, Maturity Date |  |  |  | Aug. 12, 2026 |
Senior Secured Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average effective interest rate at quarter end |  |  | 2.16% | 2.16% |

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