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Commitments and Contingencies - Schedule of Principal Contractual Obligations (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Total Obligation $ 7,657,084
Less Than 1 Year 445,582
1 to 3 Years 2,393,008
3 to 5 Years 4,735,294
More Than 5 Years 83,200
Secured Debt [Member]  
Debt Instrument [Line Items]  
Total Obligation 6,862,256
Less Than 1 Year 273,254
1 to 3 Years 2,393,008
3 to 5 Years 4,112,794
More Than 5 Years 83,200
Convertible Debt [Member]  
Debt Instrument [Line Items]  
Total Obligation 794,828
Less Than 1 Year 172,328
3 to 5 Years $ 622,500