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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt $ 8,252,940 $ 7,089,520
Debt issue costs and discount, net (62,271) (65,841)
Debt, net 8,190,669 7,023,679
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt 225,000  
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt 200,000 200,000
Term Loan [Member] | British Pound Sterling [Member]    
Debt Instrument [Line Items]    
Debt [1] 904,400  
Term Loan [Member] | Australia [Member]    
Debt Instrument [Line Items]    
Debt [1] 859,440 842,520
4.000% Senior Unsecured Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [1] 586,050 560,650
2.550% Senior Unsecured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt [1] 516,800 530,280
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 [1] 586,050 560,650
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
3.692% Senior Unsecured Notes due 2028 [Member]    
Debt Instrument [Line Items]    
Debt [1] 775,200 795,420
4.625% Senior Unsecured Notes Due 2029 [Member]    
Debt Instrument [Line Items]    
Debt $ 900,000 $ 900,000
[1] Non-U.S. dollar denominated debt that reflects the exchange rate at September 30, 2020 and December 31, 2019, respectively.