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Scheduled Principal Payments for Borrowings (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 0
2020 0
2021 400,000
2022 0
2023 400,000
Thereafter 9,595,315
Total 10,395,315
Operating Borrowings  
Debt Instrument [Line Items]  
2019 0
2020 0
2021 400,000
2022 0
2023 400,000
Thereafter 2,732,030
Total 3,532,030
Blackstone Fund Facilities CLO Vehicles  
Debt Instrument [Line Items]  
2019 0
2020 0
2022 0
Thereafter 6,863,285
Total $ 6,863,285