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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Total gross cost $ 949,822 $ 906,850 $ 833,203 $ 782,276
Real Estate Held for Sale        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Real estate held for sale, net $ 2,955 $ 9,027    
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