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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt $ 4,920,327  
Debt issue costs, net (42,017) $ (37,370)
Debt, net 4,878,310 4,037,389
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt [1] 40,627 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] 842,400  
4.000% Senior Unsecured Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Debt [3] 568,650 573,350
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 [3] 568,650 573,350
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
Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt $ 4,920,327 $ 4,074,759
[1] Includes £32 million and £22 million of GBP-denominated borrowings that reflect the exchange rate at June 30, 2019 and December 31, 2018, respectively.
[2] This note is Australian dollar-denominated and reflects the exchange rate at June 30, 2019.
[3] These notes are Euro-denominated and reflect the exchange rate at June 30, 2019 and December 31, 2018, respectively.