Related Party Transactions - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Feb. 28, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jan. 15, 2015	Jan. 01, 2015	Dec. 31, 2014	Nov. 30, 2014
Related Party Transaction [Line Items]
Due from affiliates		$ 25,974,000			$ 25,974,000					$ 31,172,000
Maximum | CREZ Project
Related Party Transaction [Line Items]
Business combination, contingent consideration, cash payments					737,000,000
Hunt Utility Services L L C
Related Party Transaction [Line Items]
Accounts payable and accrued liabilities		300,000			300,000					0
Payment for management fee					10,300,000	$ 9,100,000
Prepaid management fee		0			0					0
Accrued management fee		$ 0			0					0
Reimbursement of annual software license and maintenance fees and other expenses					$ 100,000	300,000
Management fee								$ 13,100,000	$ 10,000,000
Management agreement expiration date					Dec. 31, 2019
Agreement successive renewal terms					5 years
Management fee, description					The base fee and each base fee going forward for the twelve month period beginning on each April 1 thereafter will equal 1.50% of our total equity (including noncontrolling interest) as of December 31 of the immediately preceding year, subject to a $30.0 million cap, unless a greater amount is approved by a majority of our independent directors or a committee comprised solely of independent directors
Investment management fee equity multiplier		1.50%			1.50%
Management fee cap		$ 30,000,000			$ 30,000,000
Hunt Utility Services L L C | Scenario, Forecast
Related Party Transaction [Line Items]
Management fee							$ 14,000,000
Hunt Consolidated, Inc. and affiliates | Golden Spread Project
Related Party Transaction [Line Items]
Purchase price of assets sold											$ 7,000,000
Hunt Consolidated, Inc. and affiliates | Cross Valley
Related Party Transaction [Line Items]
Purchase price of assets sold											$ 34,200,000
Sharyland
Related Party Transaction [Line Items]
Lease revenue from related party		49,400,000	$ 41,500,000		116,900,000	100,300,000
Deferred rent liability		19,400,000			19,400,000					11,500,000
Payments to acquire plant, and equipment					179,500,000	$ 170,800,000
Accounts payable and accrued liabilities		6,000,000			6,000,000					9,200,000
Due from affiliates		26,000,000			$ 26,000,000					$ 31,200,000
Hunt-InfraREIT
Related Party Transaction [Line Items]
Common Unit, Issuance Value													$ 6,800,000
Percentage of capital expenditure agreed to issue upon operating partnership units					5.00%
Hunt-InfraREIT | Class A OP Units
Related Party Transaction [Line Items]
Members capital, shares issued												70,846
Merger of shares related obligation					983,418
Hunt-InfraREIT | Maximum
Related Party Transaction [Line Items]
Common Unit, Issuance Value		$ 82,500,000			$ 82,500,000
Hunt And Affiliated Entity
Related Party Transaction [Line Items]
Aggregate legal fees				$ 100,000	$ 5,000,000
Hunt Consolidated Incorporation | Promissory Notes at 2.5% Accrued Percentage
Related Party Transaction [Line Items]
Borrowings from related parties														$ 1,000,000
Accrued interest bearing note														2.50%
Interest bearing note, maturity date					Nov. 01, 2015
Interest bearing note, maturity date, description					This note and accrued interest were repaid in February 2015 with proceeds from our IPO for a total of $1.0 million
Repayments of related party debt	$ 1,000,000