Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Carrying Value of Intangible Assets and Accumulated Amortization (Detail)

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Real Estate and Intangible Assets - Carrying Value of Intangible Assets and Accumulated Amortization (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Below market leases and deferred revenue, gross $ (27,338) $ (26,725)
Below market leases and deferred revenue, accumulated amortization 11,988 10,475
Lease Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 197,757 194,942
Accumulated Amortization (88,414) (76,015)
In-place leases    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 81,377 80,355
Accumulated Amortization (38,767) (33,201)
Leasing costs    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 56,878 55,695
Accumulated Amortization (26,738) (23,016)
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 59,502 58,892
Accumulated Amortization (22,909) (19,798)
Above market leases and below market leases and deferred revenue    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets (liabilities), gross (12,827) (12,300)
Finite-lived intangible assets (liabilities), accumulated amortization 3,309 2,513
Above market leases    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 14,511 14,425
Accumulated Amortization $ (8,679) $ (7,962)