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Organization, Business and Summary of Significant Accounting Policies (Carrying Values and Fair Values of Debt Instruments) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Carrying value of senior notes $ 3,632,692 $ 2,157,285
Senior Notes due 2016 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes   100,000
Fair value of senior notes [1]   $ 100,536
Interest rate of senior notes 3.30% 3.30%
Senior note year due 2016 2016
Senior Notes due 2018 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 50,000 $ 50,000
Fair value of senior notes [1] $ 51,226 $ 51,860
Interest rate of senior notes 4.00% 4.00%
Senior note year due 2018 2018
Senior Notes due 2019 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 175,000 $ 175,000
Fair value of senior notes [1] $ 187,671 $ 190,985
Interest rate of senior notes 5.25% 5.25%
Senior note year due 2019 2019
Senior Notes due 2021 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 100,000 $ 100,000
Fair value of senior notes [1] $ 106,618 $ 107,613
Interest rate of senior notes 4.64% 4.64%
Senior note year due 2021 2021
New Senior Notes due 2021 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 150,000  
Fair value of senior notes [1] $ 146,168  
Interest rate of senior notes 2.39%  
Senior note year due 2021  
Senior Notes due 2022 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 125,000 $ 125,000
Fair value of senior notes [1] $ 123,974 $ 123,516
Interest rate of senior notes 3.09% 3.09%
Senior note year due 2022 2022
Senior Notes due 2023 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 200,000  
Fair value of senior notes [1] $ 192,238  
Interest rate of senior notes 2.75%  
Senior note year due 2023  
Senior Notes due 2025 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 375,000 $ 375,000
Fair value of senior notes [1] $ 368,968 $ 370,245
Interest rate of senior notes 3.41% 3.41%
Senior note year due 2025 2025
Senior Notes due 2026 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 400,000  
Fair value of senior notes [1] $ 379,438  
Interest rate of senior notes 3.03%  
Senior note year due 2026  
Tax-Exempt Bonds [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 95,430 $ 31,430
Notes Payable to Sellers and Other Third Parties [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying value of senior notes $ 14,180 $ 10,855
[1] Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.