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Leases - Schedule of Future Minimum Sublease Rental Income under Operating Leases (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating Subleases, 2019 $ 2,615 [1]
Operating Subleases, 2020 2,751
Operating Subleases, 2021 1,075
Operating Subleases, 2022 777
Operating Subleases, 2023 and thereafter 330
Operating Subleases, Total $ 7,548
[1] Amounts provided are for April 2019 through December 2019.