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Leases - Schedule of Future Rental Revenue Under Non-cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Leases [Abstract]  
2018 $ 138,488
2019 141,216
2020 139,516
2021 140,120
2022 140,086
Thereafter 465,736
Total operating leases $ 1,165,162