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Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Interest rate cap
Dec. 31, 2013
Restricted Stock Awards
Mar. 14, 2014
Subsequent Event
Interest rate cap
Mar. 03, 2014
Subsequent Event
Restricted Stock Awards
Feb. 28, 2014
Subsequent Event
Construction Loans
Oceaneering International Facility
Jan. 17, 2014
Subsequent Event
Liberty Apartments
Jan. 09, 2014
Subsequent Event
Dividend Paid
Feb. 18, 2014
Subsequent Event
Dividend Declared
Dec. 31, 2013
Subsequent Event
Dividend Declared
Subsequent Event [Line Items]                      
Dividends paid $ 7,733,000               $ 5,200,000    
Acquisition, total consideration               30,700,000      
Acquisition, common units issued               695,652      
Acquisition, repayment of loan               3,000,000      
Acquisition, assumption of debt               20,900,000      
Cash dividend/distribution, date declared                     Feb. 18, 2014
Cash dividend/distribution per share, declared $ 0.40                 $ 0.16  
Development and construction loan             19,500,000        
Restricted stock granted       169,227   99,289          
Restricted stock granted, grant date fair value       $ 11.50   $ 9.94          
Interest rate cap agreement, notional amount $ 131,377,000 $ 21,077,000 $ 121,500,000   $ 50,000,000            
Interest rate cap agreement, strike price         1.25%            
Interest rate cap agreement, expiration date         Mar. 01, 2017