Number of shares of equity interests issued or issuable to acquire entity.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Contingent Consideration - Additional Information (Details) (USD $)	3 Months Ended		1 Months Ended	0 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2010	Feb. 04, 2015	Jan. 01, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Change in fair value of contingent consideration	$ 0	$ 612,000
Contingent consideration	0					27,378,000
CREZ Project
Business Acquisition [Line Items]
Business combination, contingent consideration, cash payments			737,000,000
Business combination, contingent consideration, fair value			78,600,000
Hunt-InfraREIT
Business Acquisition [Line Items]
Business combination, contingent consideration, capital credits			$ 82,500,000
Hunt-InfraREIT \| Operating Partnership Unit
Business Acquisition [Line Items]
Shares issued				983,418
Hunt-InfraREIT \| Class A Partnership Units
Business Acquisition [Line Items]
Shares issued					53,246	6,700,000
Hunt-InfraREIT \| CREZ Project \| Class A Partnership Units
Business Acquisition [Line Items]
Shares issued price per share			$ 10.65