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Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Apr. 16, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt		$ 4,107,161		$ 4,174,693
Less - current portion		(798)		(1,786)
Less - debt issuance costs		(23,487)		(19,442)
Long-term debt and notes payable		4,082,876		4,153,465
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 472,179		481,610
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		3.06%
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		3.50%
Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 700,000		1,237,500
Interest rate		3.50%
Senior Notes due 2019 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 175,000		$ 175,000
Interest rate		5.25%		5.25%
Senior note year due		2019
Senior Notes due 2021 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 100,000		$ 100,000
Interest rate		4.64%		4.64%
Senior note year due		2021
New Senior Notes due 2021 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 150,000		$ 150,000
Interest rate		2.39%		2.39%
Senior note year due		2021
Senior Notes due 2022 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 125,000		$ 125,000
Interest rate		3.09%		3.09%
Senior note year due		2022
Senior Notes due 2023 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 200,000		$ 200,000
Interest rate		2.75%		2.75%
Senior note year due		2023
Senior Notes due 2024 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 150,000		$ 150,000
Interest rate		3.24%		3.24%
Senior note year due		2024
Senior Notes due 2025 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 375,000		$ 375,000
Interest rate		3.41%		3.41%
Senior note year due		2025
Senior Notes due 2026 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 400,000		$ 400,000
Interest rate		3.03%		3.03%
Senior note year due		2026
Senior Notes due 2027 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 250,000		$ 250,000
Interest rate		3.49%		3.49%
Senior note year due		2027
Senior Notes due 2028 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 500,000		$ 500,000
Interest rate		4.25%		4.25%
Senior note year due		2028
Senior Notes due 2029 [Member] | Senior notes
Debt Instrument [Line Items]
Total debt		$ 500,000
Interest rate		3.50%	3.50%
Senior note year due		2029
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Total debt	[1]			$ 15,930
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 9,982		$ 14,653
Debt maturity, start		2019
Debt maturity, end		2036
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]	10.90%
[1] Interest rates represent the interest rates incurred at June 30, 2019.

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