Quarterly report pursuant to Section 13 or 15(d)

Receivables, Net - Summary of Receivables (Detail)

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Receivables, Net - Summary of Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Management and advisory fees receivable $ 2,803us-gaap_AccruedFeesAndOtherRevenueReceivable $ 2,705us-gaap_AccruedFeesAndOtherRevenueReceivable
Unbilled receivables 1,990us-gaap_UnbilledContractsReceivable 2,229us-gaap_UnbilledContractsReceivable
Other receivables 2us-gaap_OtherReceivables 2us-gaap_OtherReceivables
Receivables 4,795us-gaap_AccountsReceivableGross 4,936us-gaap_AccountsReceivableGross
Allowance for doubtful receivables (365)us-gaap_AllowanceForDoubtfulAccountsReceivable (402)us-gaap_AllowanceForDoubtfulAccountsReceivable
Receivables, net $ 4,430us-gaap_AccountsReceivableNet $ 4,534us-gaap_AccountsReceivableNet