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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt $ 7,089,520  
Debt issue costs and discount, net (65,841) $ (37,370)
Debt, net 7,023,679 4,037,389
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1]   28,059
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt 200,000 200,000
Term Loan [Member] | Australia [Member]    
Debt Instrument [Line Items]    
Debt [2] 842,520  
4.000% Senior Unsecured Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [2] 560,650 573,350
2.550% Senior Unsecured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt [2] 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 [2] 560,650 573,350
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] 795,420  
4.625% Senior Unsecured Notes Due 2029 [Member]    
Debt Instrument [Line Items]    
Debt 900,000  
Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt $ 7,089,520 $ 4,074,759
[1] Includes £22 million of GBP-denominated borrowings that reflect the exchange rate at December 31, 2018.
[2] Non-U.S. dollar denominated debt that reflects the exchange rate at period end.