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Guarantees - Additional Information (Detail) (RMCO, USD $)
1 Months Ended 9 Months Ended
May 31, 2012
Sep. 30, 2013
May 31, 2013
Dec. 31, 2012
Guarantee Obligations [Line Items]        
Equity method investment, ownership percentage     50.00%  
Term of line-of-credit agreement   12 months    
Maximum amount of advances requested and unpaid principal balance   $ 12,500,000    
Guarantee expiration date May 31, 2013      
Outstanding balance of line of credit   $ 3,225,000   $ 9,285,000
Base Rate
       
Guarantee Obligations [Line Items]        
Line of credit, interest rate   0.50%    
Interest Rate Floor
       
Guarantee Obligations [Line Items]        
Line of credit, interest rate   4.00%