Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Components of Commissions and Other Receivables, Net (Detail)

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Selected Balance Sheet Data - Components of Commissions and Other Receivables, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Balance Sheet Related Disclosures [Abstract]        
Commissions due from buyer/seller $ 3,624 $ 3,241    
Due from independent contractors and others 2,124 973    
Less: allowance for doubtful accounts (62) (99) (100) (129)
Commissions and other receivables, net $ 5,686 $ 4,115