Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)				1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 09, 2015 shares	Feb. 04, 2015 USD ($) Director $ / shares shares	Jan. 29, 2015 shares	Feb. 28, 2015 USD ($)	Dec. 31, 2010 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)
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				$ 1,065,000			1,065,000
Realized gain on sale of marketable securities				$ 66,000			$ 66,000
Percentage of partnership units outstanding							71.90%
Business combination, contingent consideration, cash payments		$ 172,400,000
Contributed to the operating partnership		$ 323,200,000								$ 136,886,000
Offering expenses							$ 6,300,000
Reorganization structuring fee							44,897,000
Number of directors | Director		7
Members capital, shares issued | shares									35,053,186
Shares purchased consideration for promissory note | shares		6,242,999
Repurchase of common shares, value		$ 66,517,000					$ 66,517,000
AFUDC rate							6.60%		4.10%	9.10%
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		100,000	$ 100,000
Penalties and interest accrued							400,000		200,000
Asset retirement obligation liabilities							0
AFUDC on Borrowed Funds							1,800,000		1,600,000	12,600,000
AFUDC on Other Funds							3,000,000		1,100,000	21,700,000
Federal Income Tax
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Net operating loss carryforwards							800,000		1,000,000
Net operating loss carryforwards used							200,000
Senior Secured Notes, 8.50%
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, face amount							25,000,000
Hunt Utility Services L L C
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Management fee							12,300,000	$ 10,000,000	10,000,000	$ 11,600,000
Management fee									$ 2,500,000
CREZ Project
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Business combination, contingent consideration, cash payments					$ 737,000,000
LTIP Units
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Operating partnership issued | shares		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 | shares		1,700,000
Common stock sold under IPO, per share | $ / shares		$ 21.551
Contributed to the operating partnership		$ 323,200,000
Partners capital received | shares		8,000,000
Members capital, shares issued | shares		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 | shares		19,617,755
Common shares converted | shares		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 | shares		25,145
Common shares converted | shares		25,145
InfraREIT, L.L.C. | LTIP Units
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Common shares converted | shares	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 | shares			0.938550
Hunt-InfraREIT
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Initial public offering, net of offering costs, shares | shares		1,551,878	1,700,000
Reorganization structuring fee						$ 44,900,000
Operating partnership issued | shares		1,167,287
Common shares converted | shares	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 | shares		983,418
Hunt-InfraREIT | Operating Partnership Unit
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Common shares converted | shares		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 | shares		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 | shares		23,000,000
Common stock sold under IPO, per share | $ / shares		$ 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							28.10%
Repayments of related party debt							$ 1,000,000