Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 135,062	$ 121,299	$ 395,142	$ 354,327
Cost of revenue	124,372	105,889	355,367	309,610
Gross profit	10,690	15,410	39,775	44,717
Operating expenses:
Selling, general and administrative expenses	13,325	13,609	42,676	40,963
Amortization of intangibles	304	807	975	2,831
Total operating expenses	13,629	14,416	43,651	43,794
Operating income (loss)	(2,939)	994	(3,876)	923
Other income (expenses):
Interest expense, net	(787)	(545)	(2,355)	(1,562)
Gain (loss) on disposition of property and equipment	36	7	76	(130)
Total other expenses	(751)	(538)	(2,279)	(1,692)
Income (loss) before income taxes	(3,690)	456	(6,155)	(769)
Income tax provision (benefit)	(185)	328	(936)	(352)
Net income (loss)	(3,505)	128	(5,219)	(417)
Dividends on cumulative redeemable convertible preferred stock	0	149	(113)	631
Premium paid on redemption of redeemable convertible preferred stock	0	847	2,219	847
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (3,505)	$ (868)	$ (7,325)	$ (1,895)
Basic loss per share for common stock:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.46)	$ (0.12)	$ (0.97)	$ (0.25)
Diluted loss per share for common stock:
Net loss attributable to Limbach Holdings, Inc. common stockholders	$ (0.46)	$ (0.12)	$ (0.97)	$ (0.25)
Weighted average number of shares outstanding:
Basic	7,574,545	7,471,587	7,552,945	7,460,277
Diluted	7,574,545	7,471,587	7,552,945	7,460,277