Annual report pursuant to Section 13 and 15(d)

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

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Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Real Estate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at beginning of period $ 782,276 $ 722,565 $ 642,353
Additions:      
Acquisitions during period 52,719 60,231 105,813
Improvements 10,362 6,527 13,889
Deductions:      
Dispositions during period (10,138) (6,425) (39,490)
Impairments during period (2,016) (622) (14,238)
Balance at end of period $ 833,203 $ 782,276 $ 722,565