Revenue - Disaggregation (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Disaggregation of Revenue
Amortization of customer relationships	$ (1,781)
Total revenue	54,108
Gathering—low pressure
Disaggregation of Revenue
Revenue from contracts with customers	15,826
Gathering—high pressure
Disaggregation of Revenue
Revenue from contracts with customers	9,284
Compression
Disaggregation of Revenue
Revenue from contracts with customers	8,424
Fresh water delivery
Disaggregation of Revenue
Revenue from contracts with customers	10,776
Wastewater treatment
Disaggregation of Revenue
Revenue from contracts with customers	2,430
Other fluid handling
Disaggregation of Revenue
Revenue from contracts with customers	9,149
Cost plus 3%
Disaggregation of Revenue
Revenue from contracts with customers	9,149
Gathering And Processing
Disaggregation of Revenue
Amortization of customer relationships	(501)
Gathering And Processing | Fixed Fee
Disaggregation of Revenue
Revenue from contracts with customers	33,534
Water Handling and Treatment
Disaggregation of Revenue
Amortization of customer relationships	(1,280)
Water Handling and Treatment | Fixed Fee
Disaggregation of Revenue
Revenue from contracts with customers	$ 13,206