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Commitments and Contingencies - Schedule of Principal Debt Repayments (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Total Obligation $ 9,857,865
Less Than 1 Year 392,854
1 to 3 Years 3,484,304
3 to 5 Years 5,794,969
More Than 5 Years 185,738
Secured Debt agreements[Member]  
Debt Instrument [Line Items]  
Total Obligation 9,235,365
Less Than 1 Year 392,854
1 to 3 Years 3,484,304
3 to 5 Years 5,172,469
More Than 5 Years 185,738
Convertible Notes [Member]  
Debt Instrument [Line Items]  
Total Obligation 622,500
3 to 5 Years $ 622,500