Revenues - Schedule of Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total Service Revenue	$ 22,666	$ 38,862	$ 80,093	$ 119,101
Rental Revenue	1,130	4,236	6,111	11,864
Total Revenue	23,796	43,098	86,204	130,965
Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	16,077	26,845	56,554	82,480
Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	5,638	9,582	19,339	30,541
Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	951	2,435	4,200	6,080
Operating Segments | Rocky Mountain
Disaggregation of Revenue [Line Items]
Total Service Revenue	10,205	23,834	40,988	70,225
Rental Revenue	1,103	4,162	6,010	11,641
Total Revenue	11,308	27,996	46,998	81,866
Operating Segments | Rocky Mountain | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	8,165	17,446	31,128	51,603
Operating Segments | Rocky Mountain | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	1,380	4,452	6,769	13,669
Operating Segments | Rocky Mountain | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	660	1,936	3,091	4,953
Operating Segments | Northeast
Disaggregation of Revenue [Line Items]
Total Service Revenue	8,513	10,537	26,401	32,959
Rental Revenue	27	68	95	206
Total Revenue	8,540	10,605	26,496	33,165
Operating Segments | Northeast | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	5,613	7,413	18,746	22,681
Operating Segments | Northeast | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	2,634	2,696	6,648	9,293
Operating Segments | Northeast | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	266	428	1,007	985
Operating Segments | Southern
Disaggregation of Revenue [Line Items]
Total Service Revenue	3,948	4,491	12,704	15,917
Rental Revenue	0	6	6	17
Total Revenue	3,948	4,497	12,710	15,934
Operating Segments | Southern | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	2,299	1,986	6,680	8,196
Operating Segments | Southern | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	1,624	2,434	5,922	7,579
Operating Segments | Southern | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	25	71	102	142
Corporate/Other
Disaggregation of Revenue [Line Items]
Total Service Revenue	0	0	0	0
Rental Revenue	0	0	0	0
Total Revenue	0	0	0	0
Corporate/Other | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	0	0	0	0
Corporate/Other | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	0	0	0	0
Corporate/Other | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	$ 0	$ 0	$ 0	$ 0