Concentrations of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Securities Purchased Under Agreements to Resell	$ 7,669	$ 19,134
Securities Sold Under Agreements to Repurchase	106,499	75,563
Accounts Receivable (net of allowances of $1,362 and $2,436 at December 31, 2014 and 2013, respectively)	136,280us-gaap_AccountsReceivableNet	83,347us-gaap_AccountsReceivableNet
Investment Banking And Investment Management Receivables Collection Periods	90 days
Collection Period For Restructuring Transactions And Private Equity Fee Receivables	90 days
Bad Debt Expense	1,027us-gaap_ProvisionForDoubtfulAccounts	2,099us-gaap_ProvisionForDoubtfulAccounts	1,803us-gaap_ProvisionForDoubtfulAccounts
Marketable Securities	37,985us-gaap_MarketableSecurities	43,407us-gaap_MarketableSecurities
Percentage Of Marketable Securities Related To Corporate And Municipal Bonds And Other Debt Securities	74.00%
Percentage Of Marketable Securities Related To Seed Capital Investments And Mutual Funds	26.00%
Asset (Liability) Balance [Member]
Concentration Risk [Line Items]
Securities Purchased Under Agreements to Resell	7,669	19,134
Securities Sold Under Agreements to Repurchase	106,499	75,563
Market Value of Collateral Received or (Pledged) [Member]
Concentration Risk [Line Items]
Securities Purchased Under Agreements to Resell	7,671	19,112
Securities Sold Under Agreements to Repurchase	$ 106,632	$ 75,708

Collection period for restructuring transactions and private equity fee receivables.

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Investment banking and investment management receivables collection periods.

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Percentage of marketable securities related to corporate and municipal bonds and other debt securities.

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Percentage of marketable securities related to seed capital investments and mutual funds.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement and assets not subject to a master netting arrangement.

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