Noncontrolling Interest - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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		16,900,000	17,000,000
Operating partnership units redeem		186,496
Common shares issued		186,496
Shares purchased consideration for promissory note	6,242,999
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			1,551,878	0
Common shares issued			1,551,878
LTIP Units
Minority Interest [Line Items]
Operating partnership units issued		29,722	28,000	11,264