| 
           Borrowings - Summary of Mortgage Note Payable and Line of Credit (Parenthetical) (Detail) (MetLife [Member], USD $) 
        In Millions, unless otherwise specified  | 
        9 Months Ended | 
|---|---|
| 
           Sep. 30, 2014 
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      |
| 
           MetLife [Member] 
         | 
        |
| Debt Instrument [Line Items] | |
| New MetLife Credit Facility, termination date | May 09, 2014 | 
| Remaining availability | $ 24.8 | 
| X | ||||||||||
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- Definition 
          Long Term Debt Additional Available Amount No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
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- Definition 
          Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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