Acquisition - Narrative (Details) a in Thousands, $ in Thousands		2 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) a MMBTU customer mi	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Revenues			$ 139,163	$ 63,111	$ 358,867	$ 171,208
Net Income Attributable to Noble Midstream Partners LP			44,617	$ 41,670	$ 120,562	$ 97,604
Black Diamond Acquisition
Business Acquisition [Line Items]
Payments to acquire	$ 638,500
Length of pipeline | mi					160
Production per day | MMBTU					300
Revenues		$ 133,600	57,100
Net Income Attributable to Noble Midstream Partners LP		$ 11,600	$ 2,300
Black Diamond Acquisition
Business Acquisition [Line Items]
Dedicated acres | a					141
Number of customers | customer					6
Acquisition related costs					$ 7,500
Black Diamond Gathering LLC
Business Acquisition [Line Items]
Payment to expand acreage dedication					$ 24,100
Increase in duration of the acreage dedication					5 years
Black Diamond Gathering LLC | Black Diamond Acquisition
Business Acquisition [Line Items]
Payments to acquire	638,266
Payment to expand acreage dedication	24,120
Greenfield Member | Black Diamond Acquisition
Business Acquisition [Line Items]
Payments to acquire	318,600
Black Diamond Gathering LLC
Business Acquisition [Line Items]
Ownership interest, equity method			54.40%		54.40%
Ownership promote			4.40%		4.40%
Black Diamond Gathering LLC | Greenfield Member
Business Acquisition [Line Items]
Ownership interest, equity method			45.60%		45.60%
Noble Member | Black Diamond Acquisition
Business Acquisition [Line Items]
Payments to acquire	$ 319,900