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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt $ 8,934,187 $ 7,089,520
Debt issue costs and discount, net (68,729) (65,841)
Debt, net 8,865,458 7,023,679
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1] 165,407  
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt 200,000 200,000
Term Loan [Member] | British Pound Sterling [Member]    
Debt Instrument [Line Items]    
Debt [2] 956,900  
Term Loan [Member] | Australia [Member]    
Debt Instrument [Line Items]    
Debt [2] 923,280 842,520
4.000% Senior Unsecured Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [2] 610,800 560,650
2.550% Senior Unsecured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt [2] 546,800 530,280
5.500% Senior Unsecured Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt   300,000
6.375% Senior Unsecured Notes due 2024 [Member]    
Debt Instrument [Line Items]    
Debt   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
3.692% Senior Unsecured Notes due 2028 [Member]    
Debt Instrument [Line Items]    
Debt [2] 820,200 795,420
4.625% Senior Unsecured Notes Due 2029 [Member]    
Debt Instrument [Line Items]    
Debt 900,000 900,000
3.325% Senior Unsecured Notes Due 2025 [Member]    
Debt Instrument [Line Items]    
Debt [2] 610,800 $ 560,650
3.500% Senior Unsecured Notes Due 2031 [Member]    
Debt Instrument [Line Items]    
Debt $ 1,300,000  
[1] Includes £121 million of GBP-denominated borrowings that reflect the exchange rate at December 31, 2020.
[2] Non-U.S. dollar denominated debt that reflects the exchange rate at period end.