Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Contract revenues	$ 129,623	$ 81,455
Costs of contract revenues	114,912	72,999
Gross profit	14,711	8,456
Selling, general and administrative expenses	15,538	8,692
Operating loss from operations	(827)	(236)
Other (expense) income
Gain on sale of assets, net	372	43
Other income	13	0
Interest income	1	12
Interest expense	(1,517)	(238)
Other expense, net	(1,131)	(183)
Loss before income taxes	(1,958)	(419)
Income tax benefit	(750)	(161)
Net loss attributable to Orion common stockholders	$ (1,208)	$ (258)
Basic (loss) income per share (in dollars per share)	$ (0.04)	$ (0.01)
Diluted (loss) income per share (in dollars per share)	$ (0.04)	$ (0.01)
Shares used to compute loss per share
Basic (in shares)	27,286,981	27,604,681
Diluted (in shares)	27,286,981	27,604,681