Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information (Unaudited) [Abstract]

Schedule of Quarterly Financial Information

Quarterly financial information for the years ended December 31, 2018 and 2017 is presented below.

	2018
	1st		2nd		3rd		4th		Total
Revenues	$	87,497	$	87,193	$	85,788	$	80,977	$	341,455
Operating income		41,256		41,373		51,700		52,458		186,787
Net income attributable to GAMCO
Investors, Inc.'s shareholders		27,261		31,582		35,016		23,337		117,196
Net income attributable to GAMCO
Investors, Inc.'s shareholders per share:
Basic		0.94		1.10		1.22		0.82		4.08
Diluted	$	0.94	$	1.10	$	1.22	$	0.81	$	4.07

	2017
	1st		2nd		3rd		4th		Total
Revenues	$	85,917	$	87,600	$	88,341	$	98,666	$	360,524
Operating income		42,443		39,660		23,393		39,524		145,020
Net income attributable to GAMCO
Investors, Inc.'s shareholders		24,820		22,894		16,600		13,495		77,809
Net income attributable to GAMCO
Investors, Inc.'s shareholders per share:
Basic		0.86		0.79		0.57		0.46		2.68
Diluted	$	0.82	$	0.76	$	0.55	$	0.46	$	2.60