Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 13, 2020	Jan. 23, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt		$ 5,201,894			$ 4,375,885	[1]
Less - current portion		(4,318)			(465)	[1]
Less - debt issuance costs		(36,841)			(21,638)	[1]
Long-term debt and notes payable		5,160,735			4,353,782	[1]
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 692,623			916,247
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of credit, interest rate		2.09%
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit, interest rate		2.33%
Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 650,000			700,000
Line of credit, interest rate		2.09%
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]	$ 9,271			$ 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]	2.75%
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 March 31, 2020