Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Liability for remediation and reclamation obligations	$ 2.2	$ 2.6
Western Gas Partners, LP [Member]
Loss Contingencies [Line Items]
Committed capital	50.9
Rent expense associated with office, warehouse and equipment leases	$ 35.9	$ 34.1	$ 25.9