Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Accumulated Depreciation (Detail)

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Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Balance at beginning of period $ 153,387 $ 134,329  
Additions during period 29,915 26,927 $ 24,148
Dispositions during period (4,827) (7,869) (2,908)
Balance at end of period $ 178,475 $ 153,387 $ 134,329