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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Debt $ 4,941,310    
Debt, net 4,898,667 $ 2,909,341  
Debt issue costs, net (42,643) (31,764) $ (4,400)
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt [1] 840,810 290,000  
Term Loans [Member]      
Debt Instrument [Line Items]      
Debt 200,000 263,101  
6.375% Senior Unsecured Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Debt   350,000  
Unamortized premium   1,814  
Debt, net   351,814  
5.750% Senior Unsecured Notes Due 2020 [Member]      
Debt Instrument [Line Items]      
Debt [2]   210,340  
4.000% Senior Unsecured Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Debt [2] 600,250 525,850  
5.500% Senior Unsecured Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Debt 300,000 300,000  
6.375% Senior Unsecured Notes due 2024 [Member]      
Debt Instrument [Line Items]      
Debt 500,000 500,000  
3.325% Senior Unsecured Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Debt [2] 600,250    
5.250% Senior Unsecured Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Debt 500,000 500,000  
5.000% Senior Unsecured Notes Due 2027 [Member]      
Debt Instrument [Line Items]      
Debt 1,400,000    
Senior Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Debt $ 4,941,310 $ 2,941,105  
[1] The 2017 column includes £8 million of GBP-denominated borrowings that reflect the exchange rate at December 31, 2017.
[2] These notes are Euro-denominated and reflect the exchange rate at December 31, 2017 and December 31, 2016, respectively.