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, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at beginning of period $ 113,089 $ 92,133 $ 81,241
Additions during period 24,148 22,220 18,814
Dispositions during period (2,908) (1,264) (7,922)
Balance at end of period $ 134,329 $ 113,089 $ 92,133