Noncontrolling Interest - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Minority Interest [Line Items]
Description of units redeemed for cash or, at option, exchanged for common shares	one-for-one basis
OP Units held by the limited partners	17,100,000		17,000,000
Class A OP Units
Minority Interest [Line Items]
Shares purchased consideration for promissory note			6,242,999
Principal amount of shares purchased consideration for promissory note			$ 66.5
Class A OP Units | Hunt-InfraREIT
Minority Interest [Line Items]
Operating partnership units redeem	0		1,551,878
Common shares received			1,551,878
LTIP Units
Minority Interest [Line Items]
Operating partnership units issued	29,722	28,000