Description of the Business (Details)	6 Months Ended
Jun. 30, 2015 operating_areas
Accounting Policies [Abstract]
Number of operating areas	9

Number of operating areas in which entity own properties and oil and gas reserves.

No definition available.

Name:	vnr_NumberOfOperatingAreas
Namespace Prefix:	vnr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration