Commitments and Contingencies - Additional Information (details) (Western Gas Partners [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
---|---|---|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
Western Gas Partners [Member]
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Loss Contingencies [Line Items] | ||
Committed capital | $ 24.1 | |
Rent expense associated with office, warehouse and equipment leases | $ 4.2 | $ 2.3 |