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Debt - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Jul. 07, 2015
Nov. 21, 2014
Sep. 30, 2013
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]          
Mortgage loan outstanding balance       $ 268.8 $ 205.3
Debt instrument maturity date Jul. 07, 2019        
7.0% Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Company issued senior unsecured notes   7.00%      
Borrowed amount   $ 25.3      
Debt instrument maturity date       Nov. 15, 2019  
Notes face value   101.00%      
8.0% Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Company issued senior unsecured notes     8.00%    
Borrowed amount     $ 27.6    
Debt instrument maturity date       Sep. 30, 2018  
Notes face value     101.00%