CONDENSED CONSOLIDATED STATEMENTS OF INCOME UNAUDITED (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Investment advisory and incentive fees	$ 90,156	$ 77,443	$ 177,953	$ 150,050
Distribution fees and other income	15,767	12,522	30,640	23,875
Institutional research services	2,373	2,325	4,180	4,546
Total revenues	108,296	92,290	212,773	178,471
Expenses
Compensation	44,045	37,759	87,942	73,411
Management fee	5,144	4,846	9,872	8,826
Distribution costs	15,023	11,871	28,986	22,881
Other operating expenses	6,547	6,030	11,937	10,842
Total expenses	70,759	60,506	138,737	115,960
Operating income	37,537	31,784	74,036	62,511
Other income (expense)
Net gain from investments	9,744	12,141	16,688	24,432
Interest and dividend income	1,332	2,507	2,473	3,852
Interest expense	(2,021)	(2,796)	(4,013)	(6,284)
Shareholder-designated contribution	(134)	0	(134)	(5,000)
Total other income, net	8,921	11,852	15,014	17,000
Income before income taxes	46,458	43,636	89,050	79,511
Income tax provision	17,135	15,724	31,751	28,919
Net income	29,323	27,912	57,299	50,592
Net income attributable to noncontrolling interests	373	19	395	154
Net income attributable to GAMCO Investors, Inc.'s shareholders	$ 28,950	$ 27,893	$ 56,904	$ 50,438
Net income attributable to GAMCO Investors, Inc.'s shareholders
Basic (in dollars per share)	$ 1.14	$ 1.09	$ 2.24	$ 1.96
Diluted (in dollars per share)	$ 1.13	$ 1.09	$ 2.22	$ 1.96
Weighted average shares outstanding:
Basic (in shares)	25,381	25,679	25,431	25,710
Diluted (in shares)	25,586	25,689	25,635	25,723
Dividends declared: (in dollars per share)	$ 0.06	$ 0.05	$ 0.12	$ 0.10