Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	$ 246,334	$ 233,460	$ 734,368	$ 628,775
Products transferred at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	2,601	0	3,331	577
Products and services transferred over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	243,733	233,460	731,037	628,198
Pumping Equipment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	72,924	75,503	232,229	196,276
Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	55,098	46,062	157,766	130,142
Transport/Vaccuum
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	35,889	33,021	107,932	96,088
Coiled Tubing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	17,328	26,358	52,487	58,010
Rental Tool Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	23,511	17,833	66,153	47,166
Plugging
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	6,685	6,138	19,219	19,035
Production and Disposal Facilities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	6,158	5,297	17,853	14,990
Hot Oiler
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	4,696	4,139	15,084	13,484
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	24,045	19,109	65,645	53,584
Permian Basin | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	99,157	91,241	306,299	266,438
ArkLaTex & Mid-Continent | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	80,838	74,429	232,554	192,770
Rocky Mountain | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	48,363	49,785	135,094	120,689
Texas Gulf Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	15,792	15,831	48,970	47,156
Eastern USA | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	1,741	4,423	9,169	9,701
West Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	8,341	7,454	22,520	18,912
Corporate | Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	(7,898)	(9,703)	(20,238)	(26,891)
Completion and Remedial Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	115,978	123,650	360,523	311,466
Completion and Remedial Services | Products transferred at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Products and services transferred over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	115,978	123,650	360,523	311,466
Completion and Remedial Services | Pumping Equipment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	72,924	75,503	232,229	196,276
Completion and Remedial Services | Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Transport/Vaccuum
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Coiled Tubing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	17,328	26,358	52,487	58,010
Completion and Remedial Services | Rental Tool Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	23,511	17,833	66,153	47,166
Completion and Remedial Services | Plugging
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Production and Disposal Facilities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Hot Oiler
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	2,215	3,956	9,654	10,014
Completion and Remedial Services | Permian Basin | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	32,865	37,714	114,354	106,620
Completion and Remedial Services | ArkLaTex & Mid-Continent | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	52,549	49,659	157,993	124,827
Completion and Remedial Services | Rocky Mountain | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	31,628	35,062	88,615	78,488
Completion and Remedial Services | Texas Gulf Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	910	1,037	2,170
Completion and Remedial Services | Eastern USA | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	652	1,901	3,609	4,110
Completion and Remedial Services | West Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Completion and Remedial Services | Corporate | Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	(1,716)	(1,596)	(5,085)	(4,749)
Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	67,246	54,629	189,188	156,302
Well Servicing | Products transferred at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	2,601	0	3,331	577
Well Servicing | Products and services transferred over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	64,645	54,629	185,857	155,725
Well Servicing | Pumping Equipment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	55,098	46,062	157,766	130,142
Well Servicing | Transport/Vaccuum
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Coiled Tubing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Rental Tool Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Plugging
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	6,685	6,138	19,219	19,035
Well Servicing | Production and Disposal Facilities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Hot Oiler
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Well Servicing | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	5,463	2,429	12,203	7,125
Well Servicing | Permian Basin | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	31,046	23,259	88,423	68,333
Well Servicing | ArkLaTex & Mid-Continent | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	17,377	15,080	41,327	40,259
Well Servicing | Rocky Mountain | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	7,546	6,428	20,681	19,025
Well Servicing | Texas Gulf Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	6,636	6,804	21,289	21,600
Well Servicing | Eastern USA | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	1,089	2,522	5,560	5,591
Well Servicing | West Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	8,341	7,454	22,520	18,912
Well Servicing | Corporate | Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	(4,789)	(6,918)	(10,612)	(17,418)
Water Logistics
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	59,539	52,333	175,727	153,279
Water Logistics | Products transferred at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Products and services transferred over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	59,539	52,333	175,727	153,279
Water Logistics | Pumping Equipment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Transport/Vaccuum
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	35,889	33,021	107,932	96,088
Water Logistics | Coiled Tubing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Rental Tool Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Plugging
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Production and Disposal Facilities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	6,158	5,297	17,853	14,990
Water Logistics | Hot Oiler
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	4,696	4,139	15,084	13,484
Water Logistics | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	12,796	9,876	34,858	28,717
Water Logistics | Permian Basin | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	31,648	27,327	94,302	83,469
Water Logistics | ArkLaTex & Mid-Continent | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	10,912	9,690	33,234	27,684
Water Logistics | Rocky Mountain | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	9,189	8,295	25,798	23,176
Water Logistics | Texas Gulf Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	9,156	8,117	26,644	23,386
Water Logistics | Eastern USA | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | West Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Water Logistics | Corporate | Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	(1,366)	(1,096)	(4,251)	(4,436)
Contract Drilling
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	3,571	2,848	8,930	7,728
Contract Drilling | Products transferred at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Products and services transferred over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	3,571	2,848	8,930	7,728
Contract Drilling | Pumping Equipment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Well Servicing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Transport/Vaccuum
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Coiled Tubing
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Rental Tool Revenue
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Plugging
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Production and Disposal Facilities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Hot Oiler
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	3,571	2,848	8,930	7,728
Contract Drilling | Permian Basin | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	3,598	2,941	9,220	8,016
Contract Drilling | ArkLaTex & Mid-Continent | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Rocky Mountain | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Texas Gulf Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Eastern USA | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | West Coast | Reportable Geographical Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	0	0	0	0
Contract Drilling | Corporate | Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	$ (27)	$ (93)	$ (290)	$ (288)