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
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Below market leases and deferred revenue, gross $ (26,752) $ (26,725)
Below market leases and deferred revenue, accumulated amortization 10,974 10,475
Lease Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 196,061 194,942
Intangibles, accumulated amortization (79,760) (76,015)
In-place leases    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 80,638 80,355
Intangibles, accumulated amortization (34,902) (33,201)
Leasing costs    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 56,147 55,695
Intangibles, accumulated amortization (24,186) (23,016)
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 59,276 58,892
Intangibles, accumulated amortization (20,672) (19,798)
Above market leases and below market leases and deferred revenue    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets (liabilities), gross (12,278) (12,300)
Finite-lived intangible assets (liabilities), accumulated amortization 2,774 2,513
Above market leases    
Finite-Lived Intangible Assets [Line Items]    
Lease Intangibles 14,474 14,425
Intangibles, accumulated amortization $ (8,200) $ (7,962)