Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)				1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 09, 2015	Feb. 04, 2015	Jan. 29, 2015	Feb. 28, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Business combination, assets assumed, marketable securities						$ 1,100,000
Business combination, liabilities assumed, notes payable						$ 1,000,000
Proceeds from sale of marketable securities				$ 1,100,000			$ 1,065,000
Realized gain on sale of marketable securities				$ 100,000			66,000
Percentage of partnership units outstanding						72.20%
Business combination, contingent consideration, cash payments		$ 172,400,000
Contributed to the operating partnership		$ 323,200,000
Offering expenses						$ 6,300,000
Reorganization structuring fee							44,897,000
Shares purchased consideration for promissory note		6,242,999
Repurchase of common shares, value		$ 66,500,000					$ 66,517,000
AFUDC rate						6.70%	6.60%	4.10%
Goodwill						$ 138,384,000	$ 138,384,000
Percentage of taxable income for distribution						90.00%
Percentage of taxable income distributed						100.00%
Percentage of alternative minimum taxable income offsetting						90.00%
Penalties and interest expense						$ 200,000	200,000	$ 100,000
Penalties and interest accrued						600,000	400,000
Asset retirement obligation liabilities						0
AFUDC on Borrowed Funds						3,100,000	1,800,000	1,600,000
AFUDC on Other Funds						3,700,000	3,000,000	$ 1,100,000
Reclassification From Other Assets To Long-Term Debt
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Retrospective change in deferred financing costs							200,000
Federal Income Tax
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Net operating loss carryforwards						79,400,000	$ 13,500,000
Net operating loss carryforwards used						0
Senior Secured Notes, 8.50%
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, face amount						25,000,000
LTIP Units
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Operating partnership issued		28,000
Operating Partnership Unit | Revolving Credit Facility
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Repayments of outstanding revolving credit facility						72,000,000
Sharyland Distribution & Transmission Services | Revolving Credit Facility
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Repayments of outstanding revolving credit facility						$ 150,000,000
InfraREIT, L.L.C.
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares		1,700,000
Common stock sold under IPO, per share		$ 21.551
Contributed to the operating partnership		$ 323,200,000
Partners capital received		8,000,000
Members capital, shares issued		15,000,000
Percentage of taxable income for distribution						90.00%
Percentage of taxable income distributed						100.00%
Provision for federal income taxes						$ 0
InfraREIT, L.L.C. | Common Class A
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares		19,617,755
Common shares converted		19,617,755
InfraREIT, L.L.C. | Common Class C
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares		25,145
Common shares converted		25,145
InfraREIT, L.L.C. | LTIP Units
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Common shares converted	11,264
Common stock conversion basis						one-to-one
InfraREIT, L.L.C. | Operating Partnership Unit
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Reverse share split			0.938550
Hunt-InfraREIT
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares		1,551,878	1,700,000
Reorganization structuring fee					$ 44,900,000
Operating partnership issued		1,167,287
Common shares converted	2,329,283
Common stock conversion basis						one-for-one basis
Hunt-InfraREIT | CREZ Project
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Operating partnership issued		983,418
Hunt-InfraREIT | Operating Partnership Unit
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Common shares converted		1,551,878
MC Transmission Holdings Inc. | Operating Partnership Unit
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Shares purchased consideration for promissory note		3,325,874
Initial Public Offering
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares		23,000,000
Common stock sold under IPO, per share		$ 23.00
Gross proceeds from issuance of common stock upon initial public offering		$ 529,000,000
Hunt Consolidated Incorporation
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Percentage of partnership units outstanding						27.80%
Repayments of related party debt						$ 1,000,000