CONDENSED CONSOLIDATED STATEMENTS OF INCOME UNAUDITED (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Investment advisory and incentive fees	$ 69,252	$ 50,271	$ 132,163	$ 99,613
Institutional research services	4,241	4,524	7,890	7,948
Distribution fees and other income	11,588	7,704	21,933	14,936
Total revenues	85,081	62,499	161,986	122,497
Expenses
Compensation	34,365	25,871	67,782	52,084
Management fee	3,626	1,380	6,739	3,828
Distribution costs	9,588	7,099	23,017	14,130
Other operating expenses	7,005	5,569	13,191	10,505
Total expenses (a)	54,584	39,919	110,729	80,547
Operating income	30,497	22,580	51,257	41,950
Other income (expense)
Net gain/(loss) from investments	3,669	(7,797)	12,409	(2,565)
Interest and dividend income	1,861	1,089	3,797	1,904
Interest expense	(3,403)	(3,406)	(6,270)	(6,698)
Total other income (expense), net	2,127	(10,114)	9,936	(7,359)
Income before income taxes	32,624	12,466	61,193	34,591
Income tax provision	11,945	4,401	22,233	12,695
Net income	20,679	8,065	38,960	21,896
Net income attributable to noncontrolling interests	32	16	670	121
Net income attributable to GAMCO Investors, Inc.'s shareholders	$ 20,647	$ 8,049	$ 38,290	$ 21,775
Net income attributable to GAMCO Investors, Inc.'s shareholders per share:
Basic (in dollars per share)	$ 0.77	$ 0.30	$ 1.43	$ 0.80
Diluted (in dollars per share)	$ 0.77	$ 0.30	$ 1.42	$ 0.80
Weighted average shares outstanding:
Basic (in shares)	26,665	26,979	26,783	27,081
Diluted (in shares)	26,733	27,219	26,872	27,306
Dividends declared: (in dollars per share)	$ 0.04	$ 0.03	$ 0.07	$ 0.06