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
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]          
Balance at beginning of period   $ 642,353 $ 722,565 $ 642,353 $ 533,753
Additions:          
Acquisitions during period     60,231 105,813 103,424
Improvements     6,527 13,889 5,176
Deductions:          
Dispositions during period     (6,425) (39,490)  
Impairments during period $ (600) $ (14,000) (622) (14,238)  
Balance at end of period     $ 782,276 $ 722,565 $ 642,353