CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME
Revenues	$ 269,554	$ 216,499	$ 209,240
Operating expenses
Direct costs and expenses for advisors	156,630	132,359	124,701
Selling, general and administrative	91,046	78,863	67,841
Depreciation and amortization	12,721	7,869	7,083
Operating income (loss)	9,157	(2,592)	9,615
Interest income	107	27	14
Interest expense	(6,821)	(2,664)	(1,789)
Foreign currency transaction (loss) gain	(343)	(95)	303
Income (loss) before taxes	2,100	(5,324)	8,143
Income tax provision	4,198	1,054	3,189
Net (loss) income	(2,098)	(6,378)	4,954
Net income attributable to non-controlling interest	32	127	113
Net (loss) income attributable to ISG	$ (2,130)	$ (6,505)	$ 4,841
Weighted average shares outstanding:
Basic (in shares)	43,025	36,625	37,186
Diluted (in shares)	43,025	36,625	38,936
(Loss) earnings per share attributable to ISG:
Basic (in dollars per share)	$ (0.05)	$ (0.18)	$ 0.13
Diluted (in dollars per share)	$ (0.05)	$ (0.18)	$ 0.13
Comprehensive (loss) income:
Net (loss) income	$ (2,098)	$ (6,378)	$ 4,954
Foreign currency translation, net of tax (expense) benefit of $(1,270), $738 and $1,102, respectively.	2,134	(1,262)	(1,956)
Comprehensive income (loss)	36	(7,640)	2,998
Comprehensive income attributable to non-controlling interest	32	127	113
Comprehensive income (loss) attributable to ISG	$ 4	$ (7,767)	$ 2,885