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Guarantees - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended
May 31, 2014
Sep. 30, 2014
Dec. 31, 2013
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 $ 15,000,000    
Guarantee expiration date   May 31, 2014  
Outstanding balance of line of credit   $ 5,479,000 $ 4,256,000
Base Rate
     
Guarantee Obligations [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Line of credit base interest with floor rate 3.75%