Business Segment Information - Financial Information with Respect to Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating revenues	$ 189,847	$ 253,369	$ 387,049	$ 488,034
Direct operating costs	(143,165)	(195,959)	(295,006)	(377,275)
Segment profits	46,682	57,410	92,043	110,759
Depreciation and amortization	28,991	31,161	56,489	61,396
Capital expenditures including ARO additions	18,261	24,435	42,295	45,686
Identifiable assets	701,823	802,234	701,823	802,234	$ 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	1,810	2,055	3,526	4,111
Capital expenditures including ARO additions	226	322	499	754
Identifiable assets	267,073	314,229	267,073	314,229
Completion & Remedial Services
Segment Reporting Information [Line Items]
Operating revenues	78,061	126,948	154,895	244,545
Completion & Remedial Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	78,061	126,948	154,895	244,545
Direct operating costs	(59,660)	(100,528)	(123,092)	(190,187)
Segment profits	18,401	26,420	31,803	54,358
Depreciation and amortization	13,835	14,815	26,958	29,075
Capital expenditures including ARO additions	5,134	9,820	15,139	21,337
Identifiable assets	221,608	250,249	221,608	250,249
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues	58,168	63,268	118,683	120,219
Well Servicing | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	58,168	63,268	118,683	120,219
Direct operating costs	(45,047)	(48,200)	(92,243)	(94,712)
Segment profits	13,121	15,068	26,440	25,507
Depreciation and amortization	5,735	5,890	11,175	11,663
Capital expenditures including ARO additions	5,266	5,601	11,506	12,307
Identifiable assets	90,479	111,043	90,479	111,043
Water Logistics
Segment Reporting Information [Line Items]
Operating revenues	51,031	59,679	106,632	116,188
Water Logistics | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	51,031	59,679	106,632	116,188
Direct operating costs	(35,529)	(44,008)	(72,828)	(84,931)
Segment profits	15,502	15,671	33,804	31,257
Depreciation and amortization	7,340	8,038	14,302	15,764
Capital expenditures including ARO additions	7,518	8,589	15,027	10,778
Identifiable assets	111,723	120,814	111,723	120,814
Other Services
Segment Reporting Information [Line Items]
Operating revenues	2,587	3,474	6,839	7,082
Other Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	2,587	3,474	6,839	7,082
Direct operating costs	(2,929)	(3,223)	(6,843)	(7,445)
Segment profits	(342)	251	(4)	(363)
Depreciation and amortization	271	363	528	783
Capital expenditures including ARO additions	117	103	124	510
Identifiable assets	$ 10,940	$ 5,899	$ 10,940	$ 5,899