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Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 3,953,167 | $ 3,632,692
Less - current portion |  | (11,596) | (1,650)
Less - debt issuance costs |  | (15,810) | (14,282)
Long-term debt and notes payable |  | 3,925,761 | 3,616,760
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | [1] | $ 218,755 | 310,582
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | [1] | 2.51% |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | [1] | 3.45% |
Credit Agreement [Member] | Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | [1] | $ 1,637,500 | 1,637,500
Interest rate | [1] | 2.44% |
Senior Notes due 2018 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 50,000 | $ 50,000
Interest rate |  | 4.00% | 4.00%
Debt instrument maturity date year |  | 2018 |
Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 175,000 | $ 175,000
Interest rate |  | 5.25% | 5.25%
Debt instrument maturity date year |  | 2019 |
Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 100,000 | $ 100,000
Interest rate |  | 4.64% | 4.64%
Debt instrument maturity date year |  | 2021 |
New Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 150,000 | $ 150,000
Interest rate |  | 2.39% | 2.39%
Debt instrument maturity date year |  | 2021 |
Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 125,000 | $ 125,000
Interest rate |  | 3.09% | 3.09%
Debt instrument maturity date year |  | 2022 |
Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 200,000 | $ 200,000
Interest rate |  | 2.75% | 2.75%
Debt instrument maturity date year |  | 2023 |
Senior Notes due 2024 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 150,000 |
Interest rate |  | 3.24% |
Debt instrument maturity date year |  | 2024 |
Senior Notes due 2025 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 375,000 | $ 375,000
Interest rate |  | 3.41% | 3.41%
Debt instrument maturity date year |  | 2025 |
Senior Notes due 2026 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 400,000 | $ 400,000
Interest rate |  | 3.03% | 3.03%
Debt instrument maturity date year |  | 2026 |
Senior Notes due 2027 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | $ 250,000 |
Interest rate |  | 3.49% |
Debt instrument maturity date year |  | 2027 |
Tax-exempt Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | [1] | $ 95,430 | $ 95,430
Tax-exempt Bonds [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | [1] | 1.03% |
Tax-exempt Bonds [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | [1] | 1.05% |
Notes Payable to Sellers and Other Third Parties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | [1] | $ 26,482 | $ 14,180
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | [1] | 2.00% |
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, 2017

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