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, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance, beginning of period $ 337,377 $ 228,418 $ 148,371
Additions:      
Acquisitions during the period 129,226 100,356 75,078
Improvements 3,945 8,773 5,037
Deductions:      
Dispositions during period (4,405) (170) (68)
Purchase price adjustments 0 0 0
Balance, end of period $ 466,143 $ 337,377 $ 228,418