Commitments and Contingencies - Minimum Aggregate Lease Payments (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
Gross Rents, 2019	$ 29,093
Gross Rents, 2020	29,379
Gross Rents, 2021	28,925
Gross Rents, 2022	27,562
Gross Rents, 2023	25,064
Gross Rents, Thereafter	262,200
Gross Rents, Total lease commitments	402,223
Sublease Rents, 2019	2,382
Sublease Rents, 2020	2,290
Sublease Rents, 2021	2,160
Sublease Rents, 2022	2,002
Sublease Rents, 2023	1,938
Sublease Rents, Thereafter	8,558
Sublease Rents, Total lease commitments	19,330
Net Rents, 2019	26,711
Net Rents, 2020	27,089
Net Rents, 2021	26,765
Net Rents, 2022	25,560
Net Rents, 2023	23,126
Net Rents, Thereafter	253,642
Net Rents, Total lease commitments	$ 382,893