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Future Minimum Lease Payments to be Received under Noncancelable Subleases (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Sale Leaseback Transaction [Line Items]  
2017 $ 341
2018 199
2019 110
2020 97
2021 97
2022 and thereafter 791
Future Minimum Sublease Rentals, Sale Leaseback Transactions, Total $ 1,635