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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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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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