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Long-Term Debt (Long-Term Debt) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 2,075,260 $ 2,157,285
Less - current portion (1,590) (2,127)
Long-term debt and notes payable 2,066,051 2,147,127
Senior Notes due 2016 [Member]    
Debt Instrument [Line Items]    
Total debt $ 100,000 $ 100,000
Interest rate 3.30% 3.30%
Debt instrument maturity date year 2016  
Senior Notes due 2018 [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]    
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]    
Debt Instrument [Line Items]    
Total debt $ 100,000 $ 100,000
Interest rate 4.64% 4.64%
Debt instrument maturity date year 2021  
Senior Notes due 2022 [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 2025 [Member]    
Debt Instrument [Line Items]    
Total debt $ 375,000 $ 375,000
Interest rate 3.41% 3.41%
Debt instrument maturity date year 2025  
Tax-exempt Bonds [Member]    
Debt Instrument [Line Items]    
Total debt [1] $ 31,430 $ 31,430
Interest rate, minimum [1] 0.05%  
Interest rate, maximum [1] 0.46%  
Notes Payable to Sellers and Other Third Parties [Member]    
Debt Instrument [Line Items]    
Total debt [1] $ 9,830 10,855
Interest rate, minimum [1] 3.00%  
Interest rate, maximum [1] 10.90%  
Credit Agreement [Member] | Revolver Under Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt [1] $ 309,000 390,000
Interest rate, minimum [1] 1.44%  
Interest rate, maximum [1] 3.70%  
Credit Agreement [Member] | Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Total debt [1] $ 800,000 800,000
Interest rate, minimum [1] 1.44%  
Interest rate, maximum [1] 1.64%  
Debt Issuance Costs [Member]    
Debt Instrument [Line Items]    
Less - debt issuance costs $ (7,619) $ (8,031)
[1] *Interest rates in the table above represent the range of interest rates incurred during the three month period ended March 31, 2016.