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Senior Notes and Loans Payable - Schedule of Outstanding Loans Payable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Line of Credit Facility    
Loans payable $ 250,000 $ 250,000
Term Loan | Term loan facility    
Line of Credit Facility    
Loans payable $ 250,000 $ 250,000