Related Party Transactions (Details) (USD $)	12 Months Ended					12 Months Ended									12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Affiliated Entity	Dec. 31, 2012 Affiliated Entity	Dec. 31, 2013 Affiliated Entity Management Fee and Incentive Income	Dec. 31, 2012 Affiliated Entity Management Fee and Incentive Income	Dec. 31, 2011 Affiliated Entity Management Fee and Incentive Income	Dec. 31, 2013 Affiliated Entity Fees Payable	Dec. 31, 2012 Affiliated Entity Fees Payable	Dec. 31, 2013 Employees	Dec. 31, 2012 Employees	Apr. 30, 2011 Equity Method Investee Starboard Value LP	Apr. 30, 2011 Equity Method Investee Starboard Value LP LIBOR	Dec. 31, 2013 Equity Method Investee Due from Related Parties Starboard Value LP	Dec. 31, 2013 Investor	Dec. 31, 2012 Investor	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum
Related Party Transaction [Line Items]
Fees receivable, net of allowance	$ 45,067,000	$ 34,707,000		$ 18,900,000	$ 13,600,000
Reimbursement to affiliated funds						1,700,000	1,500,000	1,600,000
Fees payable to related parties									1,700,000	1,700,000
Due from employees											6,000,000	5,100,000
Forgivable Loan Balances											3,800,000	2,300,000
Forgivable Loans, Vesting Period																		1 year	3 years
Amortization on Forgivable Loans	3,200,000	1,900,000	1,800,000
Credit agreement with related party, maximum loan amount													3,000,000
Credit agreement with related party, interest rate														3.75%
Credit agreement with related party, loan receivable															1,500,000
Interest Income, Other															100,000
Due to Affiliate																$ 400,000	$ 400,000