Noncontrolling Interest - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Mar. 09, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	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		17,000,000		17,000,000		10,700,000
Compensation Expenses			$ 0	$ 493,000	$ 120,000
Hunt-InfraREIT
Minority Interest [Line Items]
Common shares received	2,329,283
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				$ 66,500,000
Class A OP Units | Hunt-InfraREIT
Minority Interest [Line Items]
Operating partnership units redeem				1,551,878	0
Common shares received				1,551,878
General and Administrative Expense
Minority Interest [Line Items]
Compensation Expenses		$ 200,000		$ 500,000	$ 100,000
LTIP Units
Minority Interest [Line Items]
Operating partnership units issued				28,000	11,264
Directors vesting period				1 year
Aggregate value of pre-IPO LTIP units				$ 100,000