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Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 13, 2020 | Jan. 23, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 4,721,909 |  |  | $ 4,375,885 | [1]
Less - current portion |  | (6,772) |  |  | (465) | [1]
Less - unamortized debt discount and issuance costs |  | (34,918) |  |  | (21,638) | [1]
Long-term debt and notes payable |  | 4,680,219 |  |  | 4,353,782 | [1]
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | [1] | $ 178,749 |  |  | 916,247 |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, interest rate |  | 1.35% |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, interest rate |  | 1.68% |  |  |  |
Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | [1] | $ 650,000 |  |  | 700,000 |
Line of credit, interest rate |  | 1.35% |  |  |  |
Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 100,000 |  |  | $ 100,000 | [1]
Interest rate |  | 4.64% |  |  | 4.64% |
Senior note year due |  | 2021 |  |  |  |
New Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 150,000 |  |  | $ 150,000 | [1]
Interest rate |  | 2.39% |  |  | 2.39% |
Senior note year due |  | 2021 |  |  |  |
Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 125,000 |  |  | $ 125,000 | [1]
Interest rate |  | 3.09% |  |  | 3.09% |
Senior note year due |  | 2022 |  |  |  |
Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 200,000 |  |  | $ 200,000 | [1]
Interest rate |  | 2.75% |  |  | 2.75% |
Senior note year due |  | 2023 |  |  |  |
Senior Notes due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 150,000 |  |  | $ 150,000 | [1]
Interest rate |  | 3.24% |  |  | 3.24% |
Senior note year due |  | 2024 |  |  |  |
Senior Notes due 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 375,000 |  |  | $ 375,000 | [1]
Interest rate |  | 3.41% |  |  | 3.41% |
Senior note year due |  | 2025 |  |  |  |
Senior Notes due 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 400,000 |  |  | $ 400,000 | [1]
Interest rate |  | 3.03% |  |  | 3.03% |
Senior note year due |  | 2026 |  |  |  |
Senior Notes due 2027 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 250,000 |  |  | $ 250,000 | [1]
Interest rate |  | 3.49% |  |  | 3.49% |
Senior note year due |  | 2027 |  |  |  |
Senior Notes due 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 500,000 |  |  | $ 500,000 | [1]
Interest rate |  | 4.25% |  |  | 4.25% |
Senior note year due |  | 2028 |  |  |  |
Senior Notes due 2029 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 500,000 |  |  | $ 500,000 | [1]
Interest rate |  | 3.50% |  |  | 3.50% |
Senior note year due |  | 2029 |  |  |  |
Senior Notes due 2030 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 600,000 |  |  |  |
Interest rate |  | 2.60% |  | 2.60% |  |
Senior note year due |  | 2030 |  |  |  |
Senior Notes due 2050 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  | $ 500,000 |  |  |  |
Interest rate |  | 3.05% | 3.05% |  |  |
Senior note year due |  | 2050 |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | [1] | $ 43,160 |  |  | $ 9,638 |
Debt maturity, start |  | 2021 |  |  |  |
Debt maturity, end |  | 2036 |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 2.42% |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 10.35% |  |  |  |
[1] | Interest rates represent the interest rates incurred at September 30, 2020

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