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Note Loans (Future minimum lease payments) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Capital Leases Future Minimum Payments Receivable Abstract    
2018 $ 44,986  
2019 56,421  
2020 121,121  
2021 173,305  
2022 and thereafter 285,365  
Total Minimum Lease Payments $ 681,198 $ 601,317