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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt $ 4,082,553 $ 4,941,310
Debt issue costs, net (38,704) (42,643)
Debt, net 4,043,849 4,898,667
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1] 22,153 840,810
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt 200,000 200,000
4.000% Senior Unsecured Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [2] 580,200 600,250
5.500% Senior Unsecured Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt 300,000 300,000
3.325% Senior Unsecured Notes Due 2025 [Member]    
Debt Instrument [Line Items]    
Debt [2] 580,200 600,250
6.375% Senior Unsecured Notes due 2024 [Member]    
Debt Instrument [Line Items]    
Debt 500,000 500,000
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 $ 1,400,000
[1] Includes £17 million and £8 million of GBP-denominated borrowings that reflect the exchange rate at September 30, 2018 and December 31, 2017, respectively.
[2] These notes are Euro-denominated and reflect the exchange rate at September 30, 2018 and December 31, 2017, respectively.