Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Detail)

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Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 98,379
2019 98,805
2020 91,777
2021 83,241
2022 76,481
Thereafter 313,241
Tenant Lease Payments 761,924
Ground Leases  
Operating Leased Assets [Line Items]  
2018 465
2019 465
2020 466
2021 392
2022 319
Thereafter 4,236
Tenant Lease Payments $ 6,343