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Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Apr. 02, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 3,763,330 |  | $ 3,926,321
Less - current portion |  | (1,753) |  | (11,659)
Less - debt issuance costs |  | (14,368) |  | (15,090)
Long-term debt and notes payable |  | 3,747,209 |  | 3,899,572
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | [1] | $ 169,950 |  | 192,101
Interest rate | [1] | 2.93% |  |
Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | [1] | $ 1,637,500 |  | 1,637,500
Interest rate | [1] | 3.34% |  |
Senior Notes due 2018 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  |  |  | 50,000
Interest rate |  |  | 4.00% |
Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 175,000 |  | 175,000
Interest rate |  | 5.25% |  |
Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 100,000 |  | 100,000
Interest rate |  | 4.64% |  |
New Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 150,000 |  | 150,000
Interest rate |  | 2.39% |  |
Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 125,000 |  | 125,000
Interest rate |  | 3.09% |  |
Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 200,000 |  | 200,000
Interest rate |  | 2.75% |  |
Senior Notes due 2024 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 150,000 |  | 150,000
Interest rate |  | 3.24% |  |
Senior Notes due 2025 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 375,000 |  | 375,000
Interest rate |  | 3.41% |  |
Senior Notes due 2026 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 400,000 |  | 400,000
Interest rate |  | 3.03% |  |
Senior Notes due 2027 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 250,000 |  | 250,000
Interest rate |  | 3.49% |  |
Tax-exempt Bonds [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | [1] | $ 15,930 |  | 95,430
Interest rate | [1] | 1.61% |  |
Notes Payable to Sellers and Other Third Parties [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | [1] | $ 14,950 |  | $ 26,290
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | [1] | 2.75% |  |
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | [1] | 24.81% |  |
[1] | Interest rates represent the interest rates incurred at September 30, 2018

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