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
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Balance Sheet Related Disclosures [Abstract]        
Commissions due from buyer/seller $ 3,993 $ 3,241    
Due from independent contractors 1,907 973    
Less: allowance for doubtful accounts (73) (99) (129) (129)
Commissions and other receivables, net $ 5,827 $ 4,115