Net Income (Loss) Per Share - Reconciliation of the numerator and denominator of the basic and diluted net (loss) income per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerators:
Net income (loss)	$ (10,463)	$ 7,657	$ (18,076)	$ 9,624
Non-controlling interest	(73)	11	290	337
Net income (loss) attributable to Steel Excel Inc.	$ (10,536)	$ 7,668	$ (17,786)	$ 9,961
Denominators:
Basic weighted average common shares outstanding (in Shares)	11,572	11,895	11,524	11,938
Effect of dilutive securities:
Stock-based awards (in shares)	0	22	0	20
Diluted weighted average common shares outstanding (in Shares)	11,572	11,917	11,524	11,958
Basic income (loss) per share attributable to Steel Excel Inc.:
Net income (loss) (in dollars per share)	$ (0.91)	$ 0.64	$ (1.54)	$ 0.83
Diluted income (loss) per share attributable to Steel Excel Inc.:
Net income (loss) (in dollars per share)	$ (0.91)	$ 0.64	$ (1.54)	$ 0.83
Antidilutive securities excluded (in shares)	15		15