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Fair Value Disclosures - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Mortgage loans
Sep. 30, 2013
Mortgage loans
Maximum
Sep. 30, 2013
Mortgage loans
Original Tranche
Sep. 30, 2013
Mortgage loans
Additional Tranche
Sep. 30, 2013
Fair Value, Inputs, Level 2
Fixed-Rate Debt
Dec. 31, 2012
Fair Value, Inputs, Level 2
Fixed-Rate Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Debt instrument, Face amount $ 25   $ 11 $ 14    
Debt instrument, Interest rate     4.85% 3.84%    
Debt instrument, Maturity Date     2020-09 2020-09    
Debt instrument, Outstanding principal amount   10.00%        
Debt outstanding carrying value         57.7 43.8
Debt outstanding fair value         $ 60.9 $ 50.1