Revenues - Schedule of Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Service Revenue	$ 22,956	$ 41,238	$ 57,427	$ 80,239
Rental Revenue	1,510	4,002	4,981	7,628
Total Revenue	24,466	45,240	62,408	87,867
Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	16,763	28,470	40,477	55,635
Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	5,336	10,983	13,701	20,959
Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	857	1,785	3,249	3,645
Operating Segments | Rocky Mountain
Disaggregation of Revenue [Line Items]
Total Service Revenue	10,747	25,065	30,783	46,391
Rental Revenue	1,475	3,928	4,907	7,479
Total Revenue	12,222	28,993	35,690	53,870
Operating Segments | Rocky Mountain | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	8,649	18,448	22,963	34,157
Operating Segments | Rocky Mountain | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	1,533	5,146	5,389	9,217
Operating Segments | Rocky Mountain | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	565	1,471	2,431	3,017
Operating Segments | Northeast
Disaggregation of Revenue [Line Items]
Total Service Revenue	8,129	10,649	17,888	22,422
Rental Revenue	33	71	68	138
Total Revenue	8,162	10,720	17,956	22,560
Operating Segments | Northeast | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	5,989	7,296	13,133	15,268
Operating Segments | Northeast | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	1,851	3,098	4,014	6,597
Operating Segments | Northeast | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	289	255	741	557
Operating Segments | Southern
Disaggregation of Revenue [Line Items]
Total Service Revenue	4,080	5,524	8,756	11,426
Rental Revenue	2	3	6	11
Total Revenue	4,082	5,527	8,762	11,437
Operating Segments | Southern | Water Transport Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	2,125	2,726	4,381	6,210
Operating Segments | Southern | Disposal Services
Disaggregation of Revenue [Line Items]
Total Service Revenue	1,952	2,739	4,298	5,145
Operating Segments | Southern | Other Revenue
Disaggregation of Revenue [Line Items]
Total Service Revenue	3	59	77	71
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