NET INCOME PER COMMON SHARE (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic:
Net income attributable to ISG	$ 1,778	$ 2,353	$ 3,565	$ 5,521
Weighted average common shares	37,315	37,039	37,182	37,214
Earnings per share attributable to ISG	$ 0.05	$ 0.06	$ 0.10	$ 0.15
Diluted:
Net income attributable to ISG	$ 1,778	$ 2,353	$ 3,565	$ 5,521
Interest expense of convertible debt, net of tax	21	25	60	71
Net income, attributable to ISG, as adjusted	$ 1,799	$ 2,378	$ 3,625	$ 5,592
Basic Weighted Average Common shares	37,315	37,039	37,182	37,214
Potential common shares	1,981	1,701	1,737	1,599
Diluted weighted average common shares	39,296	38,740	38,919	38,813
Diluted earnings per share attributable to ISG	$ 0.05	$ 0.06	$ 0.09	$ 0.14