Business Segment Information - Financial Information with Respect to Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating revenues	$ 178,365	$ 246,334	$ 565,414	$ 734,368
Direct operating costs	(138,466)	(190,399)	(433,472)	(567,673)
Segment profits	39,899	55,935	131,942	166,695
Depreciation and amortization	29,179	32,754	85,668	94,150
Capital expenditures	11,601	23,142	53,896	68,828
Identifiable assets	667,629	778,970	667,629	778,970	$ 761,777
Corporate and Other
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	1,803	2,130	5,293	6,241
Capital expenditures	212	804	712	1,558
Identifiable assets	257,684	307,404	257,684	307,404
Completion & Remedial Services
Segment Reporting Information [Line Items]
Operating revenues	70,002	115,978	224,897	360,523
Completion & Remedial Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	70,002	115,978	224,897	360,523
Direct operating costs	(53,825)	(89,777)	(176,918)	(279,963)
Segment profits	16,177	26,201	47,979	80,560
Depreciation and amortization	13,930	16,563	40,898	45,638
Capital expenditures	2,494	10,664	17,634	32,002
Identifiable assets	205,950	245,273	205,950	245,273
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues	57,094	64,314	175,777	184,532
Well Servicing | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	57,094	64,314	175,777	184,533
Direct operating costs	(43,510)	(50,591)	(135,752)	(145,303)
Segment profits	13,584	13,723	40,025	39,230
Depreciation and amortization	5,608	6,533	16,464	18,196
Capital expenditures	1,622	4,921	13,127	17,227
Identifiable assets	82,819	105,287	82,819	105,287
Water Logistics
Segment Reporting Information [Line Items]
Operating revenues	48,451	59,539	155,083	175,727
Water Logistics | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	48,451	59,539	155,083	175,727
Direct operating costs	(34,783)	(42,785)	(107,611)	(127,716)
Segment profits	13,668	16,754	47,472	48,011
Depreciation and amortization	7,774	7,214	22,824	22,978
Capital expenditures	7,273	6,710	22,300	17,488
Identifiable assets	115,693	115,803	115,693	115,803
Other Services
Segment Reporting Information [Line Items]
Operating revenues	2,818	6,503	9,657	13,586
Other Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	2,818	6,503	9,657	13,585
Direct operating costs	(6,348)	(7,246)	(13,191)	(14,691)
Segment profits	(3,530)	(743)	(3,534)	(1,106)
Depreciation and amortization	64	314	189	1,097
Capital expenditures	0	43	123	553
Identifiable assets	$ 5,483	$ 5,203	$ 5,483	$ 5,203