Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Components of Investments in Real Estate (Detail)

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Real Estate and Intangible Assets - Components of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real estate:      
Land $ 137,532 $ 125,905  
Building and improvements 851,245 755,584  
Tenant improvements 68,201 65,160  
Accumulated depreciation (207,523) (178,257)  
Total real estate, net 849,455 768,392  
Building and Improvements      
Real Estate Properties [Line Items]      
Depreciation $ 32,800 $ 29,900 $ 26,900