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Property Acquisitions - Pro Forma Condensed Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]    
Revenues from continuing operations $ 118,003 $ 117,340
Earnings from continuing operations $ 41,763 $ 22,399
Basic and diluted earnings from continuing operations per common share $ 1.24 $ 0.66