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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
[1]
Property, Plant and Equipment [Line Items]    
Impairments $ 6,518 $ 272,624
Western Gas Partners, LP [Member] | Newcastle System [Member]    
Property, Plant and Equipment [Line Items]    
Impairments 6,200  
Western Gas Partners, LP [Member] | Newcastle System [Member] | Fair Value Measurements Nonrecurring [Member] | Level 3 Inputs [Member] | Income Approach Valuation Technique [Member]    
Property, Plant and Equipment [Line Items]    
Estimated fair value $ 3,100  
[1] Financial information has been recast to include the financial position and results attributable to the Springfield system. See Note 1 and Note 2.