Annual report pursuant to Section 13 and 15(d)

REPORTABLE SEGMENT INFORMATION - Major Customers (Details)

v3.10.0.1
REPORTABLE SEGMENT INFORMATION - Major Customers (Details) - Total revenue
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Customer Concentration Risk | Customer A      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 24.10% 15.00% 18.00%
Customer Concentration Risk | Customer B      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 16.50% 13.80% 12.50%
Customer Concentration Risk | Customer C      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 12.20% 12.70% 8.70%
Customer Concentration Risk | Customer D      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 8.90% 12.60% 7.00%
Customer Concentration Risk | Customer E      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 7.10% 11.80% 0.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer A      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 97.40% 99.90% 96.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer B      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 98.30% 99.20% 99.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer C      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 100.00% 99.90% 100.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer D      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 100.00% 99.80% 99.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer E      
Revenue, Major Customer [Line Items]      
Concentration risk percentage 100.00%