Property and Equipment - Property and Equipment and Related Accumulated Amortization Under Capital Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 116,657	$ 109,905
Less accumulated amortization	31,058	18,445
Property and equipment under capital lease, net	85,599	91,460
Pumping equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	56,425	56,225
Water logistics equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	42,083	40,097
Light vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	16,283	12,160
Contract drilling equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	818	783
Well service units and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	98	262
Construction equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	378	378
Rental equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 572	$ 0