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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Jul. 07, 2015
Nov. 21, 2014
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Nov. 24, 2014
Mar. 26, 2014
Debt Instrument [Line Items]              
Mortgage loan outstanding balance       $ 272,000,000 $ 205,300,000    
Debt instrument maturity date Jul. 07, 2019            
Secured Bridge Loan             $ 19,000,000
Bridge Loan [Member]              
Debt Instrument [Line Items]              
Interest rate on loan       10.00%      
Debt instrument maturity date       Mar. 26, 2015      
Limited partnership interests in the subsidiary       100.00%      
Outstanding balance on the Bridge Financing       $ 0 $ 0    
7.0% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Interest rate on loan   7.00%       7.00%  
Borrowed amount   $ 25,300,000       $ 25,300,000  
Debt instrument maturity date       Nov. 15, 2019      
Debt instrument callable date       Nov. 16, 2017      
Notes face value   101.00%          
8.0% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Interest rate on loan     8.00%        
Borrowed amount     $ 27,600,000        
Debt instrument maturity date       Sep. 30, 2018      
Debt instrument callable date       Oct. 01, 2016      
Notes face value     101.00%