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Lease Arrangements - Schedule of Future Minimum Lease Payments to be Received from Sales-Type Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Capital Leases Future Minimum Payments Receivable [Abstract]    
2019 $ 11,339  
2020 990  
2021 431  
2022 189  
2023 60  
Total minimum lease payments receivable $ 13,009 $ 14,238