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Summary of Future Minimum Rental Payments to be Received Under Operating Leases (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Operating Leases  
Remaining 2019 $ 3,963
2020 3,995
2021 3,272
2022 2,433
2023 1,763
Thereafter 2,546
Total future minimum rentals $ 17,972