Condensed Combined Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts receivable, allowance for doubtful accounts	$ 1,728	$ 773
Other receivables, allowance for doubtful accounts	723	1,080
Investments at fair value, cost basis		$ 69,066
Class A common stock
Common stock, par value (in dollars per share)	$ 0.01
Class B common stock
Common stock, par value (in dollars per share)	$ 0.01