Operating Segments - Condensed Consolidated Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 129,177	$ 163,856	$ 363,540	$ 437,813
Gross profit	24,463	24,171	60,382	62,730
Selling, general and administrative	18,302	17,045	52,679	47,596
Amortization of intangibles	87	109	295	526
Operating income	6,074	7,017	7,408	14,608
Interest expense, net	(424)	(2,154)	(2,140)	(6,449)
Loss on early debt extinguishment	0	0	(1,961)	0
(Loss) gain on disposition of property and equipment	(49)	3	(41)	18
(Loss) gain on change in fair value of warrant liability	0	(1,371)	14	(1,312)
Total unallocated amounts	(473)	(3,522)	(4,128)	(7,743)
Income before income taxes	5,601	3,495	3,280	6,865
Depreciation and amortization	1,389	1,495	4,353	4,635
Operating Segments | GCR
Segment Reporting Information [Line Items]
Revenue	89,950	130,498	262,304	345,921
Gross profit	12,754	14,848	31,034	38,043
Selling, general and administrative	9,586	10,501	27,770	28,700
Depreciation and amortization	1,035	1,046	3,091	3,108
Operating Segments | ODR
Segment Reporting Information [Line Items]
Revenue	39,227	33,358	101,236	91,892
Gross profit	11,709	9,323	29,348	24,687
Selling, general and administrative	8,013	6,240	22,893	18,157
Depreciation and amortization	267	340	967	1,001
Corporate
Segment Reporting Information [Line Items]
Selling, general and administrative	703	304	2,016	739
Depreciation and amortization	$ 87	$ 109	$ 295	$ 526