Business Segment Information - Financial Information with Respect to Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 95,400	$ 178,365	$ 313,560	$ 565,414
Depreciation and amortization			40,593	85,668
Identifiable assets	396,705		396,705		$ 550,474
Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	95,400	144,163	313,440	445,328
Direct operating costs	(84,775)	(108,579)	(264,506)	(328,762)
Segment profits	10,625	35,584	48,934	116,566
Depreciation and amortization	12,976	17,819	40,593	51,297
Capital expenditures	959	10,122	7,278	42,690
Identifiable assets	388,263	561,410	388,263	561,410
Discontinued Operations
Segment Reporting Information [Line Items]
Operating revenues	0	34,202	120	120,086
Direct operating costs	(2,304)	(29,886)	(4,714)	(104,710)
Segment profits	(2,304)	4,316	(4,594)	15,376
Depreciation and amortization	0	11,360	0	34,370
Capital expenditures	0	1,479	0	11,206
Identifiable assets	8,442	106,219	8,442	106,219
Corporate and Other | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Direct operating costs	0	0	0	0
Segment profits	0	0	0	0
Depreciation and amortization	1,496	1,140	4,679	3,283
Capital expenditures	0	181	(3)	626
Identifiable assets	158,699	257,959	158,699	257,959
Well Servicing | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	53,211	57,439	158,670	177,941
Direct operating costs	(44,766)	(48,111)	(134,968)	(143,081)
Well Servicing | Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	53,211	57,439	158,670	177,941
Direct operating costs	(44,766)	(48,111)	(134,968)	(143,081)
Segment profits	8,445	9,328	23,702	34,860
Depreciation and amortization	2,302	3,425	7,200	9,858
Capital expenditures	403	1,622	2,257	13,166
Identifiable assets	44,717	82,819	44,717	82,819
Water Logistics | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	30,705	48,451	108,340	155,083
Direct operating costs	(28,506)	(34,783)	(87,207)	(107,611)
Water Logistics | Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	30,705	48,451	108,340	155,083
Direct operating costs	(28,506)	(34,783)	(87,207)	(107,611)
Segment profits	2,199	13,668	21,133	47,472
Depreciation and amortization	6,190	4,747	19,365	13,667
Capital expenditures	363	7,306	3,824	22,357
Identifiable assets	122,555	115,693	122,555	115,693
Completion & Remedial Services | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	11,484	38,273	46,430	112,304
Direct operating costs	(11,503)	(25,685)	(42,331)	(78,070)
Completion & Remedial Services | Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	11,484	38,273	46,430	112,304
Direct operating costs	(11,503)	(25,685)	(42,331)	(78,070)
Segment profits	(19)	12,588	4,099	34,234
Depreciation and amortization	2,988	8,507	9,349	24,489
Capital expenditures	193	1,013	1,200	6,541
Identifiable assets	$ 62,292	$ 104,939	$ 62,292	$ 104,939