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Commitments and Contingencies - Schedule of Principal Debt Repayments (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Total Obligation $ 9,406,113
Less Than 1 Year 113,124
1 to 3 Years 3,679,052
3 to 5 Years 4,750,799
More Than 5 Years 863,138
Secured Debt agreements[Member]  
Debt Instrument [Line Items]  
Total Obligation 8,283,613
Less Than 1 Year 109,374
1 to 3 Years 3,266,552
3 to 5 Years 4,520,799
More Than 5 Years 386,888
Secured Term Loans [Member]  
Debt Instrument [Line Items]  
Total Obligation 500,000
Less Than 1 Year 3,750
1 to 3 Years 10,000
3 to 5 Years 10,000
More Than 5 Years 476,250
Convertible Notes [Member]  
Debt Instrument [Line Items]  
Total Obligation 622,500
1 to 3 Years 402,500
3 to 5 Years $ 220,000