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Property, Plant and Equipment - Historical Cost Table (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 6,700,809 $ 6,556,778 [1]
Accumulated depreciation 1,760,590 1,697,999 [1]
Net property, plant and equipment 4,940,219 4,858,779 [1]
Western Gas Partners, LP [Member] | Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 3,946 3,744
Western Gas Partners, LP [Member] | Gathering Systems [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 6,160,896 6,061,004
Western Gas Partners, LP [Member] | Gathering Systems [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Western Gas Partners, LP [Member] | Gathering Systems [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 47 years  
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 136,263 136,290
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 45 years  
Western Gas Partners, LP [Member] | Assets Under Construction [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 371,358 329,887
Western Gas Partners, LP [Member] | Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 28,346 $ 25,853
Western Gas Partners, LP [Member] | Other [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Western Gas Partners, LP [Member] | Other [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 40 years  
[1] Financial information has been recast to include the financial position and results attributable to the Springfield system. See Note 1 and Note 2.