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, 2018
Dec. 31, 2017
Dec. 31, 2016
Real estate:      
Land $ 125,905 $ 121,783  
Building and improvements 755,584 708,948  
Tenant improvements 65,160 63,122  
Accumulated depreciation (178,257) (149,417)  
Total real estate, net 768,392 744,436  
Building and Improvements      
Real Estate Properties [Line Items]      
Depreciation $ 29,900 $ 26,900 $ 24,100