Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation 2 (Detail)

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Schedule III - Real Estate and Accumulated Depreciation 2 (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Total gross cost $ 1,064,389 $ 949,822 $ 906,850 $ 833,203
Real estate and related assets held for sale, net 3,990 4,151    
Real Estate Held for Sale        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Real estate and related assets held for sale, net $ 3,990 $ 4,151    
Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Depreciable life shorter of the useful life of the asset or 39 years      
Depreciable life 39 years      
Improvements | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Depreciable life 5 years      
Improvements | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Depreciable life 20 years