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Debt - Long-Term Debt Maturities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2018 $ 2,919  
2019 444,157  
2020 1,792,114  
2021 898,181  
2022 1,264,348  
Thereafter 6,903,784  
Subtotal 11,305,503  
Premiums (discounts), net (25,771)  
Debt issuance costs, net (47,603)  
Total 11,232,129 $ 9,412,631
Credit Facilities [Member]    
Debt Instrument [Line Items]    
2018 0  
2019 0  
2020 219,944  
2021 15,878  
2022 0  
Thereafter 0  
Subtotal 235,822  
Premiums (discounts), net 0  
Debt issuance costs, net 0  
Total 235,822 317,392
Senior Notes [Member]    
Debt Instrument [Line Items]    
2018 0  
2019 0  
2020 1,157,600  
2021 810,320  
2022 810,320  
Thereafter 5,637,801  
Subtotal 8,416,041  
Premiums (discounts), net (27,318)  
Debt issuance costs, net (35,627)  
Total 8,353,096 6,067,277
Term Loans And Other Debt [Member]    
Debt Instrument [Line Items]    
2018 492  
2019 1,014  
2020 391,077  
2021 910  
2022 441,792  
Thereafter 951,438  
Subtotal 1,786,723  
Premiums (discounts), net 0  
Debt issuance costs, net (8,330)  
Total 1,778,393 2,060,491
Secured Mortgages [Member]    
Debt Instrument [Line Items]    
2018 2,427  
2019 443,143  
2020 23,493  
2021 71,073  
2022 12,236  
Thereafter 314,545  
Subtotal 866,917  
Premiums (discounts), net 1,547  
Debt issuance costs, net (3,646)  
Total $ 864,818 $ 967,471