Receivable From Employees and Related Parties (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Advances to Employees	$ 3,624	$ 4,830
Personal Expenses Paid on Behalf of Employees and Related Parties	213	49
Receivable from Affiliates	390	689
Reimbursable Expenses Due From Portfolio Companies of the Company's Private Equity Funds	409	636
Reimbursable Expenses Relating to the Private Equity Funds	530	1,589
Receivable from Employees and Related Parties	$ 5,166	$ 7,793