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Other Receivables - Summary of Other Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other Receivables [Line Items]    
Asset management fees $ 2,874 $ 2,182
New issue and advisory 1,109 168
Reimbursable costs   191
Accrued interest and dividend receivable, net 1,508 375
Commissions receivable 1,221 1,101
Payroll tax refund receivable   149
Incentive and reimbursement receivable from landlord   706
Secured receivable 1,582  
Other 194 659
Other receivables $ 8,488 $ 5,531