Concentrations of Credit Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012 D	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Securities Sold Under Agreements to Repurchase	$ 120,787	$ 129,577
Total Receivable	89,098	52,060
Investment banking and investment management receivables collection periods (in days)	90
Collection period for restructuring transactions and private equity fee receivables (in days)	90
Bad debt Expense	1,803	1,558	1,008
Marketable Securities	36,545	81,288
Percentage of marketable securities related to corporate and municipal bonds and other debt securities	37.00%
Percentage of marketable securities related to seed capital investments and mutual funds	63.00%
Market Value Of Collateral Received Or (Pledged)
Concentration Risk [Line Items]
Securities Sold Under Agreements to Repurchase	$ 121,029	$ 129,809

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 of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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