Organization and Nature of Operations - Partnership Assets (Details)	9 Months Ended
	Sep. 30, 2018
Colorado River DevCo LP
Equity [Line Items]
NBLX Ownership	100.00%
San Juan River DevCo LP
Equity [Line Items]
NBLX Ownership	25.00%
Noncontrolling Interest	75.00%
Green River DevCo LP
Equity [Line Items]
NBLX Ownership	25.00%
Noncontrolling Interest	75.00%
Laramie River DevCo LP
Equity [Line Items]
NBLX Ownership	100.00%
Blanco River DevCo LP
Equity [Line Items]
NBLX Ownership	40.00%
Noncontrolling Interest	60.00%
Gunnison River DevCo LP
Equity [Line Items]
NBLX Ownership	5.00%
Noncontrolling Interest	95.00%
Trinity River DevCo LLC
Equity [Line Items]
NBLX Ownership	100.00%