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Credit Agreements and Senior Notes - Senior Notes - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2017
Debt Instrument [Line Items]      
Unamortized discounts, net   $ 7,000  
Debt issuance costs, net   17,300  
Loss on extinguishment of senior notes     $ (35,366)
Proceeds from issuance of senior notes     $ 496,360
5.875% Senior Notes due 2019 [Member]      
Debt Instrument [Line Items]      
Redemption of outstanding senior notes $ 543,000    
Loss on extinguishment of senior notes 35,400    
7.875% Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of senior unsecured notes 500,000 $ 500,000  
Proceeds from issuance of senior notes $ 489,100    
7.875% Senior Notes due 2025 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   15 days  
7.875% Senior Notes due 2025 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   60 days  
3.45% Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of senior unsecured notes   $ 250,000  
3.45% Senior Notes due 2023 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   15 days  
3.45% Senior Notes due 2023 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   60 days  
4.875% Senior Notes due 2043 [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of senior unsecured notes   $ 750,000  
4.875% Senior Notes due 2043 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   15 days  
4.875% Senior Notes due 2043 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   60 days  
5.70% Senior Notes due 2039 [Member]      
Debt Instrument [Line Items]      
Aggregate principal amount of senior unsecured notes   $ 500,000  
5.70% Senior Notes due 2039 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   15 days  
5.70% Senior Notes due 2039 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Notice period for redemption of senior notes   60 days