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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt $ 10,125,462 $ 8,934,187
Debt issue costs and discount, net (78,354) (68,729)
Debt, net 10,047,108 8,865,458
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1] 212,997 165,407
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt 200,000 200,000
Term Loan [Member] | United Kingdom [Member]    
Debt Instrument [Line Items]    
Debt [2] 968,170 956,900
Term Loan [Member] | Australia [Member]    
Debt Instrument [Line Items]    
Debt [2] 899,760 923,280
4.000% Senior Unsecured Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [2] 592,900 610,800
2.550% Senior Unsecured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt [2] 553,240 546,800
3.325% Senior Unsecured Notes Due 2025 [Member]    
Debt Instrument [Line Items]    
Debt [2] 592,900 610,800
2.500% Senior Unsecured Notes due 2026 [Member]    
Debt Instrument [Line Items]    
Debt [2] 691,550  
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] 829,860 820,200
4.625% Senior Unsecured Notes Due 2029 [Member]    
Debt Instrument [Line Items]    
Debt 900,000 900,000
3.375% Senior Unsecured Notes due 2030 [Member]    
Debt Instrument [Line Items]    
Debt [2] 484,085  
3.500% Senior Unsecured Notes due 2031 [Member]    
Debt Instrument [Line Items]    
Debt $ 1,300,000 $ 1,300,000
[1] Includes £154 million and £121 million of GBP-denominated borrowings that reflect the exchange rate at June 30, 2021 and December 31, 2020, respectively.
[2] Non-U.S. dollar denominated debt reflects the exchange rate at June 30, 2021 and December 31, 2020.