Annual report pursuant to Section 13 and 15(d)

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

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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Change in Balance of Real Estate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]    
Balance, beginning of period $ 466,143 $ 337,377
Additions:    
Acquisitions during the period 90,671 129,226
Improvements 21,811 3,945
Deductions:    
Dispositions during period (15,621) (4,405)
Balance, end of period $ 563,004 $ 466,143