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Fair Value of Financial Instruments (Carrying Values and Fair Values of Debt Instruments) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Apr. 16, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Carrying value of senior notes $ 4,107,161   $ 4,174,693
Senior notes | Senior Notes due 2019 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes 175,000   175,000
Fair value of senior notes [1] $ 176,250   $ 177,870
Interest rate 5.25%   5.25%
Senior note year due 2019    
Senior notes | Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 100,000   $ 100,000
Fair value of senior notes [1] $ 102,936   $ 101,292
Interest rate 4.64%   4.64%
Senior note year due 2021    
Senior notes | New Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 150,000   $ 150,000
Fair value of senior notes [1] $ 148,603   $ 144,305
Interest rate 2.39%   2.39%
Senior note year due 2021    
Senior notes | Senior Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 125,000   $ 125,000
Fair value of senior notes [1] $ 125,924   $ 120,682
Interest rate 3.09%   3.09%
Senior note year due 2022    
Senior notes | Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 200,000   $ 200,000
Fair value of senior notes [1] $ 198,899   $ 188,363
Interest rate 2.75%   2.75%
Senior note year due 2023    
Senior notes | Senior Notes due 2024 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 150,000   $ 150,000
Fair value of senior notes [1] $ 152,209   $ 142,877
Interest rate 3.24%   3.24%
Senior note year due 2024    
Senior notes | Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 375,000   $ 375,000
Fair value of senior notes [1] $ 384,334   $ 355,541
Interest rate 3.41%   3.41%
Senior note year due 2025    
Senior notes | Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 400,000   $ 400,000
Fair value of senior notes [1] $ 400,776   $ 367,143
Interest rate 3.03%   3.03%
Senior note year due 2026    
Senior notes | Senior Notes due 2027 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 250,000   $ 250,000
Fair value of senior notes [1] $ 257,054   $ 234,243
Interest rate 3.49%   3.49%
Senior note year due 2027    
Senior notes | Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000   $ 500,000
Fair value of senior notes [1] $ 548,650   $ 506,100
Interest rate 4.25%   4.25%
Senior note year due 2028    
Senior notes | Senior Notes due 2029 [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes $ 500,000    
Fair value of senior notes [1] $ 519,150    
Interest rate 3.50% 3.50%  
Senior note year due 2029    
[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.