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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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