Quarterly report pursuant to Section 13 or 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
Sep. 30, 2018
Dec. 31, 2017
Real estate:    
Land $ 122,890 $ 121,783
Building and improvements 726,690 708,948
Tenant improvements 63,897 63,122
Accumulated depreciation (170,824) (149,417)
Total real estate, net $ 742,653 $ 744,436