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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, 2017
Dec. 31, 2016
Capital Leases Future Minimum Payments Receivable [Abstract]    
2018 $ 11,211  
2019 2,172  
2020 592  
2021 205  
2022 58  
Total minimum lease payments receivable $ 14,238 $ 5,053