Quarterly report pursuant to sections 13 or 15(d)

Debt - Summary of Notes Payable (Detail)

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Debt - Summary of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total, Notes payable $ 9,606 $ 3,315
Notes Payable [Member]
   
Debt Instrument [Line Items]    
Principal on fixed rate notes, Amount 3,771 2,397
Principal on fixed rate notes, Interest Rate 5.00% 5.00%
Variable rate notes issued for redemption of partners' interests, Amount 5,719 872
Variable rate notes issued for redemption of partners' interests, spread 1.00% 1.00%
Variable rate notes issued for redemption of partners' interests, reference rate Prime Prime
Interest payable $ 116 $ 46