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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt $ 4,876,759  
Debt, net 4,832,264 $ 2,909,341
Debt issue costs, net (46,044) (31,764)
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1] 445,359 290,000
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 350,000 350,000
Unamortized premium 1,549 1,814
Debt, net 351,549 351,814
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] 590,700 525,850
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] 590,700  
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 $ 4,878,308 $ 2,941,105
[1] Includes £4 million of GBP-denominated borrowings that reflect the exchange rate at September 30, 2017.
[2] These notes are Euro-denominated and reflect the exchange rate at September 30, 2017 and December 31, 2016, respectively.