InfraREIT (HIFR) 10-Q 14 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	11-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	HIFR
Entity Registrant Name	InfraREIT, Inc.
Entity Central Index Key	1506401
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		43,565,495

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$86,516,000	$15,612,000
Restricted cash	1,682,000	1,682,000
Due from affiliates	21,039,000	27,822,000
Inventory	7,508,000	7,393,000
Assets held for sale		41,211,000
Prepaids and other current assets	1,580,000	4,897,000
Total current assets	118,325,000	98,617,000
Electric Plant, net	1,276,260,000	1,227,146,000
Goodwill	138,384,000	138,384,000
Deferred Assets and Other Regulatory Assets, net	37,085,000	37,948,000
Investments	2,519,000	2,519,000
Total Assets	1,572,573,000	1,504,614,000
Current Liabilities
Accounts payable and accrued liabilities	13,785,000	25,295,000
Short-term borrowings		219,000,000
Current portion of long-term debt	19,332,000	19,234,000
Dividends and distributions payable	8,483,000	14,130,000
Contingent consideration	0	27,378,000
Accrued taxes	2,567,000	2,359,000
Total current liabilities	44,167,000	307,396,000
Long-Term Debt	605,652,000	610,522,000
Regulatory Liability	3,941,000	1,242,000
Total liabilities	653,760,000	919,160,000
Commitments and Contingencies
Equity
Members' capital - 35,053,186 shares issued and outstanding as of December 31, 2014		440,387,000
Common stock, $0.01 par value; 450,000,000 shares authorized; 43,565,495 issued and outstanding as of March 31, 2015	436,000
Additional paid-in capital	702,213,000
Accumulated deficit	-35,257,000
Accumulated other comprehensive loss	0
Total InfraREIT, Inc. equity	667,392,000	440,387,000
Noncontrolling interest	251,421,000	145,067,000
Total equity	918,813,000	585,454,000
Total Liabilities and Equity	$1,572,573,000	$1,504,614,000

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Members capital, shares issued		35,053,186
Members capital, shares outstanding		35,053,186
Common stock, par or stated value per share	$0.01
Common stock, shares authorized	450,000,000
Common stock, shares issued	43,565,495
Common stock, shares, outstanding	43,565,495

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Lease revenue	$29,372	$24,837
Operating costs and expenses
General and administrative expense	48,733	3,412
Depreciation	9,508	8,461
Total operating costs and expenses	58,241	11,873
(Loss) income from operations	-28,869	12,964
Other (expense) income
Interest expense, net	-7,422	-7,681
Other income (expense), net	626	-133
Total other (expense) income	-6,796	-7,814
(Loss) income before income taxes	-35,665	5,150
Income tax expense	208	158
Net (loss) income	-35,873	4,992
Less: Net (loss) income attributable to noncontrolling interest	-9,000	1,147
Net (loss) income attributable to InfraREIT, Inc.	($26,873)	$3,845
Net (loss) income attributable to InfraREIT, Inc. common shareholders per share:
Basic	($0.65)	$0.11
Diluted	($0.65)	$0.11
Cash dividends declared per common share	$0.40

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	($35,873)	$4,992
Change in fair value of cash flow hedging instrument		395
Comprehensive (loss) income	-35,873	5,387
Less: Comprehensive (loss) income attributable to noncontrolling interest	-9,000	1,238
Comprehensive (loss) income attributable to InfraREIT, Inc.	($26,873)	$4,149

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Members' Capital	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total InfraREIT, Inc. Equity	Noncontrolling Interest
In Thousands
Balance at Dec. 31, 2014	$585,454	$440,387				$440,387	$145,067
Dividends and distributions	-20,195	-8,964			-6,099	-15,063	-5,132
Repurchase of common shares	-66,517	-66,517				-66,517
Initial public offering, net of offering costs	490,433		230	490,203		490,433
Merger of InfraREIT, L.L.C. and InfraREIT, Inc. and related Reorganization transactions	-101,885	-367,191	206	212,010		-154,975	53,090
Net income (loss)	-35,873	2,285			-29,158	-26,873	-9,000
Equity based compensation	123						123
Non-cash noncontrolling interest equity issuance	67,273						67,273
Balance at Mar. 31, 2015	$918,813		$436	$702,213	($35,257)	$667,392	$251,421

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income (loss)	($35,873,000)	$4,992,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	9,508,000	8,461,000
Amortization of deferred financing cost	912,000	829,000
Allowance for funds used during construction - equity	-548,000	-473,000
Change in fair value of contingent consideration	0	612,000
Reorganization structuring fee	44,897,000
Realized gain on sale of marketable securities	-66,000
Equity based compensation	123,000
Changes in assets and liabilities:
Due from affiliates	6,783,000	7,563,000
Inventory	-115,000	180,000
Prepaids and other current assets	-1,026,000	-604,000
Accounts payable and accrued liabilities	584,000	-1,172,000
Net cash provided by operating activities	25,179,000	20,388,000
Cash flows from investing activities
Additions to electric plant	-67,210,000	-65,493,000
Proceeds from sale of assets	41,211,000
Sale of marketable securities	1,065,000
Cash paid to InfraREIT, L.L.C. investors in the merger, net of cash assumed	-172,400,000
Net cash used in investing activities	-197,334,000	-65,493,000
Cash flows from financing activities
Net proceeds from issuance of common stock upon initial public offering	493,722,000
Members' contributions		1,171,000
Noncontrolling interest contributions		349,000
Proceeds from short-term borrowings	33,000,000	56,000,000
Repayments of short-term borrowings	-253,000,000
Proceeds from borrowings of long-term debt		11,000,000
Repayments of long-term debt	-4,772,000	-1,004,000
Deferred financing costs	-49,000	-677,000
Dividends paid	-19,794,000
Distributions paid to noncontrolling interest	-6,048,000
Net cash provided by financing activities	243,059,000	66,839,000
Net increase in cash and cash equivalents	70,904,000	21,734,000
Cash and cash equivalents at beginning of period	15,612,000	7,746,000
Cash and cash equivalents at end of period	$86,516,000	$29,480,000

Description_of_Business_and_Pr

Description of Business and Presentation of Financial Statements	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Presentation of Financial Statements	1	Description of Business and Presentation of Financial Statements
	InfraREIT, Inc. is a Maryland corporation and the surviving corporation of a merger (Merger) with InfraREIT, L.L.C., a Delaware limited liability company, completed on February 4, 2015 in connection with the initial public offering (IPO) of InfraREIT, Inc. As used in this Quarterly Report on Form 10-Q, unless the context requires otherwise or except as otherwise noted, the words “Company,” “InfraREIT,” “we,” “our” and “us” refer to InfraREIT, L.L.C., before giving effect to the Merger, and InfraREIT, Inc., after giving effect to the Merger, as the context requires, and also refer to the registrant’s subsidiaries, including InfraREIT Partners, LP (Operating Partnership or InfraREIT LP), a Delaware limited partnership.
	The Merger was accounted for as a reverse acquisition in accordance with Accounting Standards Codification (ASC) Topic 805, Business Combinations. Therefore, for accounting purposes, we treated the assets and liabilities of InfraREIT, Inc. as assumed and incorporated with the assets and liabilities of InfraREIT, L.L.C. The main assets and liabilities assumed were marketable securities of $1.1 million and a note payable of $1.0 million. The marketable securities were sold during February 2015 for $1.1 million resulting in a realized gain of $0.1 million which is recorded in other income (expense), net in the Consolidated Statements of Operations. Additionally, the note payable and associated interest were paid in full in February 2015.
	We hold 71.9% of the outstanding partnership units (OP Units) in the Operating Partnership as of March 31, 2015 and are its general partner. We include the accounts of the Operating Partnership and its subsidiaries in our consolidated financial statements. MC Transmission Holdings, Inc. (MC Transmission), which is a subsidiary of Marubeni Corporation (Marubeni), seven members of our board of directors and affiliates of Hunt Consolidated, Inc. (HCI) hold the other 28.1% of the outstanding OP Units as of March 31, 2015.
	Description of Business
	We are the owners of electric transmission and distribution assets (T&D assets) throughout Texas, including the Texas Panhandle near Amarillo (Panhandle assets), the Permian Basin in and around Stanton, Central Texas around Brady, Northeast Texas in and around Celeste (S/B/C assets) and South Texas near McAllen (McAllen assets). InfraREIT, L.L.C. elected to be treated as a real estate investment trust (REIT) for U.S. federal income tax purposes commencing with the taxable year ended December 31, 2010, and InfraREIT, Inc. will elect to be taxed as a REIT commencing with the taxable year ending December 31, 2015. We are externally managed and advised by Hunt Utility Services, LLC (Hunt Manager), which is responsible for overseeing our day-to-day affairs, subject to the oversight of our board of directors.
	Initial Public Offering and Reorganization
	We completed our IPO on February 4, 2015, issuing 23,000,000 shares of common stock at a price of $23.00, resulting in gross proceeds of $529.0 million.
	Immediately after the closing of our IPO, we completed the Merger, with InfraREIT, L.L.C. merging with and into InfraREIT, Inc., and InfraREIT, Inc. as the surviving entity and general partner of the Operating Partnership. InfraREIT, Inc. used $172.4 million of the net proceeds from the IPO to fund the cash portion of the consideration issued in the Merger, as described in greater detail below. We contributed the remaining $323.2 million to the Operating Partnership in exchange for common OP Units (Common OP Units).
	The Operating Partnership used its net proceeds from the IPO that it received from InfraREIT, Inc.:
	·	to repay an aggregate of $1.0 million of indebtedness to HCI;
	·	to repay an aggregate of $72.0 million of indebtedness outstanding under the Operating Partnership’s revolving credit facility and $150.0 million of indebtedness outstanding under Sharyland Distribution & Transmission Services, L.L.C.’s (SDTS) revolving credit facility;
	·	to pay offering expenses (other than the underwriting discounts and commissions and the underwriter structuring fee) of $6.3 million; and
	·	for general corporate purposes.
	The following bullets describe the Merger and related transactions we effected in the first quarter of 2015 (collectively, the Reorganization).
	·	On January 29, 2015, the Operating Partnership effected a reverse unit split whereby each holder of OP Units received 0.938550 OP Units of the same class in exchange for each such unit it held immediately prior to such time, which is referred to as the unit split. Also, on January 29, 2015, InfraREIT, L.L.C. effected a reverse share split whereby each holder of shares received 0.938550 shares of the same class in exchange for each such share it held immediately prior to such time, which is referred to as the share split. All references to unit, share, per unit and per share amounts in these unaudited consolidated financial statements and related disclosures have been adjusted to reflect the reverse share split and reverse unit split for all periods presented.
	·	On January 29, 2015, InfraREIT, Inc. issued 1,700,000 shares of common stock to Hunt-InfraREIT, L.L.C. (Hunt-InfraREIT) as a non-cash reorganization advisory fee in accordance with the structuring fee agreement, resulting in our recognition of a $44.9 million non-cash expense in the first quarter of 2015.
	·	On February 4, 2015, the Operating Partnership issued 1,700,000 OP Units to InfraREIT, Inc. in respect of the structuring fee issuance of 1,700,000 shares of InfraREIT, Inc. common stock described immediately above.
	·	On February 4, 2015, the Operating Partnership issued an aggregate of 28,000 of its profit interest partnership units (LTIP Units) to seven of our directors.
	·	On February 4, 2015, the Operating Partnership issued 983,814 Common OP Units to Hunt-InfraREIT in settlement of the Operating Partnership’s obligation to issue OP Units to Hunt-InfraREIT related to the construction of transmission assets in the Texas Panhandle and Southern Plains (CREZ Project).
	·	On February 4, 2015, the Operating Partnership issued Hunt-InfraREIT 1,167,287 Common OP Units as an accelerated payment of a portion of the carried interest agreed to in 2010 in connection with the organization of InfraREIT, L.L.C. To effect the shift in ownership from the pre-IPO investors to Hunt-InfraREIT, an equal number of OP Units held by InfraREIT, L.L.C. in the Operating Partnership were cancelled at the same time.
	·	On February 4, 2015, as a result of the Merger, (1) holders of 8,000,000 common shares of InfraREIT, L.L.C. received $21.551 per common share, which was equal to the IPO price less the underwriting discounts and commissions and an underwriting structure fee, (2) holders of the remaining 19,617,755 common shares of InfraREIT, L.L.C. received 19,617,755 shares of InfraREIT, Inc. Class A common stock and (3) holders of 25,145 Class C shares of InfraREIT, L.L.C. received 25,145 shares of InfraREIT, Inc. Class C common stock.
	·	Marubeni, John Hancock Life Insurance Company (U.S.A), Teachers Insurance and Annuity Association of America, OpTrust Infrastructure N.A. Inc. (OpTrust) (collectively, founding investors) each received both cash and stock consideration in the Merger, and all other pre-IPO investors received shares of InfraREIT, Inc. Class A common stock or Class C common stock in the Merger. InfraREIT, L.L.C. gave each other holder of its common shares the opportunity to receive cash consideration in the Merger, and each such holder elected (or was deemed to have elected) to receive shares of Class A common stock under the merger agreement. All holders of InfraREIT, L.L.C.’s Class C common shares, as a separate class, received shares of Class C common stock pursuant to the merger agreement.
	·	On February 4, 2015, InfraREIT, Inc. contributed $323.2 million to the Operating Partnership in exchange for 15,000,000 Common OP Units.
	·	On February 4, 2015, InfraREIT, Inc. issued 1,551,878 shares of common stock to Hunt-InfraREIT in exchange for 1,551,878 OP Units tendered for redemption by Hunt-InfraREIT in accordance with a redemption agreement.
	·	On February 4, 2015, we purchased 6,242,999 common shares in consideration for the issuance of a promissory note to Westwood Trust in the principal amount of $66.5 million.
	·	Westwood Trust immediately transferred the promissory note to MC Transmission, and, immediately following receipt of the promissory note, MC Transmission purchased 3,325,874 Common OP Units from the Operating Partnership in consideration for the assignment of the promissory note. The promissory note was then transferred to InfraREIT, Inc. in exchange for the redemption of 6,242,999 OP Units held by InfraREIT, Inc. and the subsequent cancellation of such promissory note, resulting in no cash consideration being paid or received pursuant to the purchase from Westwood Trust or the sale of Common OP Units to MC Transmission.
	·	On March 9, 2015, the Operating Partnership issued 2,329,283 Common OP Units to Hunt-InfraREIT, and InfraREIT, Inc. canceled an equal number of shares of Class A common stock and Class C common stock. Each remaining share of Class A common stock and Class C common stock then converted to common stock on a one-for-one basis. This issuance settled InfraREIT, L.L.C.’s pre-IPO investors carried interest obligation agreed to by Hunt-InfraREIT under the investment documents entered into by the parties in 2010.
	·	On March 9, 2015, the 11,264 long-term incentive plan units issued to two of InfraREIT, L.L.C.’s non-voting directors in May 2014 converted on a one-to-one basis to Common OP Units.
	Limited Partnership Agreement
	In connection with the Reorganization, we adopted a Second Amended and Restated Limited Partnership Agreement which became effective with the closing of our IPO. Upon completion of the IPO, the Operating Partnership had five types of OP Units outstanding: Common OP Units, Class A OP Units, Class B OP Units, Class C OP Units and LTIP Units.
	On March 9, 2015, the Operating Partnership issued Common OP Units in exchange for outstanding Class A OP Units and Class C OP Units. Such Common OP Units were allocated among the holders of Class A OP Units and Class C OP Units, and the Class A OP Units, Class B OP Units and Class C OP Units were cancelled. Following such allocation, we adopted a third amended and restated partnership agreement that eliminated the provisions related to the Reorganization and the description of the Class A OP Units, Class B OP Units and Class C OP Units; however, it continues to allow amendments to authorize and issue additional classes of OP Units in the future.
	Basis of Presentation
	The accompanying unaudited interim consolidated financial statements of InfraREIT, Inc. include our accounts and the accounts of all other entities in which we have a controlling financial interest with noncontrolling interest of consolidated subsidiaries reported separately. This Quarterly Report on Form 10-Q presents the operating results of InfraREIT, L.L.C. for the three months ended March 31, 2014 and the InfraREIT, L.L.C. balance sheet as of December 31, 2014. Our operating results for the three months ended March 31, 2015 reflect the operations of InfraREIT, L.L.C. prior to the effectiveness of the Merger, and the operations of InfraREIT, Inc. for the period from the Merger through March 31, 2015, and our balance sheet as of March 31, 2015 is the balance sheet of InfraREIT, Inc.
	These unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015.
	The Consolidated Balance Sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.
	For further information, refer to the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014, filed with the Securities and Exchange Commission on March 18, 2015.
	Recently Issued Accounting Pronouncements
	In February 2015, the FASB issued Accounting Standard Update (ASU) 2015-02, Consolidation (Topic 810) – Amendments to the Consolidation Analysis. This amendment affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 is effective for periods beginning after December 15, 2015 with early adoption permitted. The adoption of the new guidance is not expected to have a material impact on our financial position, results of operations or cash flows.
	In April 2015, the FASB issued ASU 2015-03, Interest – Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. This ASU is effective for periods beginning after December 15, 2015 with early adoption permitted. When adopted, the new guidance will be applied on a retrospective basis with each balance sheet presented reflecting the new guidance along with transitional disclosures. The adoption is not expected to have a material impact on our financial position, results of operations or cash flows.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	2	Related Party Transactions
	Our subsidiaries are parties to several lease agreements with Sharyland Utilities, L.P. (Sharyland) and SU FERC, L.L.C. (SU FERC), through which we lease our T&D assets to Sharyland. Under the leases we have agreed to fund capital expenditures for footprint projects. Our leases define “footprint projects” to be transmission or distribution projects primarily situated within our distribution service territory, or that physically hang from our existing transmission assets.
	We earned lease revenues under these agreements of $29.4 million and $24.8 million from Sharyland during the three months ended March 31, 2015 and 2014, respectively.
	As of March 31, 2015 and December 31, 2014, amounts due from affiliates on the Consolidated Balance Sheets included $21.0 million and $27.8 million, respectively, related to amounts owed by Sharyland or SU FERC associated with our leases.
	We make payments to Sharyland to reimburse Sharyland for costs of gross plant and equipment related to the build out of the T&D assets as provided in the leases. For the three months ended March 31, 2015 and 2014, those amounts were $67.4 million and $46.4 million, respectively and were included as electric plant, net on the Consolidated Balance Sheets. As of March 31, 2015 and December 31, 2014, accounts payable and accrued liabilities on the Consolidated Balance Sheets included $4.1 million and $16.1 million, respectively, related to amounts owed to Sharyland as reimbursements for acquisition of gross plant and equipment.
	In connection with the organization of InfraREIT, L.L.C. in November 2010, the Operating Partnership agreed to issue deemed capital credits and Class A OP Units to Hunt-InfraREIT with respect to certain development projects. The amount of the capital account credits the Operating Partnership was required to issue equaled 5% of our capital expenditures on these projects, including AFUDC. The number of Class A OP Units the Operating Partnership was required to issue equaled the amount of the capital account credit divided by $10.65. During the three months ended March 31, 2014, the Operating Partnership issued approximately 31,088 Class A OP Units, and on January 1, 2015, the Operating Partnership issued an additional 17,600 Class A OP Units to Hunt-InfraREIT. Following the consummation of our IPO, the Operating Partnership no longer has the obligation to issue deemed capital credits and related equity to Hunt-InfraREIT. We recorded these capital account credits as asset acquisition costs included as part of the capital project in our construction work in progress (CWIP) balance.
	InfraREIT LP also issued deemed capital and equity in connection with its CREZ Project. For further information, see Note 11, Contingent Consideration.
	Our management fee paid to Hunt Manager for the three months ended March 31, 2015 and 2014 was $2.5 million and $1.3 million, respectively. As of March 31, 2015 and December 31, 2014, there were no prepaid or accrued amounts associated with management fees on the Consolidated Balance Sheets. Additionally, during the three months ended March 31, 2015 and 2014, we paid Hunt Manager $0.2 million for reimbursement of annual software license and maintenance fees in accordance with our management agreement.
	Our current management agreement with Hunt Manager, which was effective February 4, 2015, provided for an annual base fee, or management fee, of $10.0 million through April 1, 2015. Effective as of April 1, 2015, the annual base fee was adjusted to $13.1 million annually through March 31, 2016. The base fee for each twelve month period beginning April 1 thereafter will equal 1.50% of our total equity as of December 31 of the immediately preceding year, subject to a $30.0 million cap. The term of the management agreement expires December 31, 2019, and will automatically renew for successive five-year terms unless a majority of our independent directors decides to terminate the agreement.
	Prior to our IPO, we and one of our stockholders were parties to a secondee agreement under which employees of the stockholder provided services to us for a secondment fee. We incurred costs associated with secondment fees of less than $0.1 million during the three months ended March 31, 2014. We did not incur any fees associated with this agreement in 2015. These fees are included in general and administrative expense in the Consolidated Statements of Operations. As of March 31, 2015 and December 31, 2014, there were no amounts owed to the member included in accounts payable and accrued liabilities on the Consolidated Balance Sheets related to the secondee agreement. As a result of our IPO, the secondee agreement terminated.
	In connection with the IPO, Reorganization and related transactions, we incurred an aggregate of $5.0 million of legal fees, a portion of which was paid to reimburse Hunt and its affiliates, the founding investors and independent directors for legal expenses they incurred in connection with such transactions. This legal expense reimbursement relates to the fees and expenses of outside counsel incurred by those parties and was negotiated separately from the reorganization advisory fee that we paid to Hunt-InfraREIT in connection with the reorganization advisory services provided in connection with the IPO. For further information on additional related party transactions we entered into as a result of the Reorganization, see the caption Initial Public Offering and Reorganization included in Note 1, Description of Business and Presentation of Financial Statements.
	On November 20, 2014, InfraREIT, Inc. borrowed $1.0 million from HCI. The note accrued interest at 2.5% per year and was due on November 1, 2015. This note and accrued interest was repaid in February 2015 with proceeds from our IPO for a total of $1.0 million.
	On January 15, 2015, we sold assets related to the Cross Valley transmission line (Cross Valley) and the Golden Spread Electric Coop (GSEC) interconnection to Hunt for a total purchase price of $41.2 million. For further information, see Note 3, Assets Held for Sale.

Assets_Held_for_Sale

Assets Held for Sale	3 Months Ended
	Mar. 31, 2015
Discontinued Operations And Disposal Groups [Abstract]
Assets Held for Sale	3	Assets Held for Sale
	In October 2014, InfraREIT, L.L.C.’s board of directors approved a plan to sell the assets related to the Cross Valley and GSEC interconnection projects. As of December 31, 2014, these assets were classified as assets held for sale at the lower of historical carrying amount or fair value on the Consolidated Balance Sheets as they met the criteria for “held for sale” accounting as of December 31, 2014. These assets represent labor, materials, allowance for funds used during construction (AFUDC) and various other costs associated with the construction of the Cross Valley and GSEC interconnections projects.
	The assets of the Cross Valley and GSEC interconnection projects classified as assets held for sale on the Consolidated Balance Sheets were $41.2 million as of December 31, 2014. Since these assets were not placed in service as of December 31, 2014, no depreciation was taken.
	Effective January 15, 2015, we sold all the assets related to Cross Valley to a newly formed development company owned by Hunt and certain of our founding investors for cash of $34.2 million, which equaled the CWIP of the project on the date of the sale, plus reimbursement of out of pocket expenses associated with the project financing.
	Also effective January 15, 2015, we sold all the assets related to the GSEC interconnection project to Hunt for cash of $7.0 million, which equaled the CWIP of the project on the date of the sale.
	In accordance with our development agreement, Hunt will continue to fund the construction of these identified projects and is required to offer them to us at least 90 days before each project is placed in service.

Prepaids_and_Other_Current_Ass

Prepaids and Other Current Assets	3 Months Ended
	Mar. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Prepaids Expenses And Other Current Assets	4	Prepaids and Other Current Assets
	Prepaids and other current assets are as follows:
	(In thousands)		31-Mar-15		31-Dec-14
	Offering costs		$	—	$	4,397
	Prepaid insurance			1,280		249
	Other			300		251
	Total prepaids and other current assets		$	1,580	$	4,897
	Offering costs consisted of costs directly attributable to the registration of our common stock in connection with our IPO. These offering costs, which were netted against our IPO proceeds, equaled $6.3 million in the aggregate, of which $4.4 million were on the Consolidated Balance Sheet at December 31, 2014.

Electric_Plant_and_Depreciatio

Electric Plant and Depreciation	3 Months Ended
	Mar. 31, 2015
Public Utilities Property Plant And Equipment [Abstract]
Electric Plant and Depreciation	5	Electric Plant and Depreciation
	The major classes of electric plant are as follows:
	(In thousands)		31-Mar-15			31-Dec-14
	Electric plant:
	Transmission plant		$	970,993		$	966,560
	Distribution plant			399,361			387,329
	General plant			15,604			15,018
	Total plant in service			1,385,958			1,368,907
	CWIP			79,641			41,222
	Total electric plant			1,465,599			1,410,129
	Accumulated depreciation			(226,457	)		(220,101	)
	Electric plant held for future use			37,118			37,118
	Electric plant, net		$	1,276,260		$	1,227,146
	General plant consists primarily of a warehouse, buildings and associated assets. CWIP relates to various transmission and distribution projects underway. The capitalized amounts of CWIP consist primarily of route development expenditures, labor and materials expenditures, right of way acquisitions, engineering services and legal fees. Electric plant, net includes plant acquisition adjustments of $28.9 million and $28.7 million at March 31, 2015 and December 31, 2014, respectively.
	Electric plant held for future use includes approximately 66 miles of existing transmission lines and two substations located near Stanton, Texas purchased on December 30, 2013 from Southwestern Public Service Company. SDTS holds legal title to the assets and they are subject to a lease with Sharyland. Sharyland will have the responsibility for operating these T&D assets and complying with all applicable regulatory requirements.

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	6	Goodwill
	Goodwill represents the excess of costs of an acquired business over the fair value of the assets acquired, less liabilities assumed. We conduct an impairment test of goodwill at least annually. As of March 31, 2015 and December 31, 2014, $138.4 million was recorded as goodwill in the Consolidated Balance Sheets.

Deferred_Assets_and_Other_Regu

Deferred Assets and Other Regulatory Assets, Net	3 Months Ended
	Mar. 31, 2015
Deferred Finance Costs And Other Regulatory Assets Net [Abstract]
Deferred Assets and Other Regulatory Assets, Net	7	Deferred Assets and Other Regulatory Assets, net
	Deferred financing costs primarily consist of costs incurred in connection with the establishment of the InfraREIT LP revolving credit facility and issuance of $25.0 million aggregate principal amount of 8.5% per annum senior notes, see Note 8, Borrowings Under Credit Facilities and Note 9, Long-Term Debt.
	Other regulatory assets consist of deferred financing costs within our regulated entities. These assets are classified as regulatory assets and amortized over the length of the related loan. These costs will be included in the costs to be recovered in connection with a future rate case. Deferred financing costs included in other regulatory assets primarily consist of debt issuance costs incurred in connection with the construction credit agreement entered into by Sharyland Projects, LLC (SPLLC) on June 20, 2011 and refinancing costs incurred in connection with the amended and restated revolving credit facility entered into by SDTS on June 28, 2013. On December 10, 2014, the SDTS credit facility was amended and restated in order to increase the revolving credit facility to a total of $250.0 million revolving credit facility with additional financing costs incurred, see Note 8, Borrowings Under Credit Facilities and Note 9, Long-Term Debt.
	Deferred costs recoverable in future years of $23.8 million at March 31, 2015 and December 31, 2014 represent operating costs incurred from inception of Sharyland through December 31, 2007. We have determined that these costs are probable of recovery through future rates based on orders of the Public Utility Commission of Texas (PUCT) in Sharyland’s prior rate cases and regulatory precedent.
	Deferred assets and other regulatory assets, net are as follows:
			31-Mar-15							31-Dec-14
	(In thousands)		Gross		Accumulated			Net		Gross		Accumulated			Net
			Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
			Amount					Amount		Amount					Amount
	Deferred financing costs		$	1,292	$	(199	)	$	1,093	$	1,290	$	(143	)	$	1,147
	Other regulatory assets:
	Deferred financing costs			25,748		(13,549	)		12,199		25,701		(12,693	)		13,008
	Deferred costs recoverable in future years			23,793		—			23,793		23,793		—			23,793
	Deferred financing costs and other regulatory		$	50,833	$	(13,748	)	$	37,085	$	50,784	$	(12,836	)	$	37,948
	assets, net

Borrowings_Under_Credit_Facili

Borrowings Under Credit Facilities	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Borrowings Under Credit Facilities	8	Borrowings Under Credit Facilities
	InfraREIT LP Revolving Credit Facilities
	On January 3, 2014, InfraREIT LP entered into a credit agreement, as amended, led by Bank of America, N.A. as administrative agent, which established a revolving credit facility of $130.0 million that included a letter of credit facility. On November 13, 2014, the credit facility was amended to extend the maturity date to March 31, 2015. On December 10, 2014, the credit facility was repaid and terminated using proceeds from InfraREIT LP’s new $75.0 million credit facility and SDTS’s amended credit agreement entered into on December 10, 2014, as discussed below.
	On December 10, 2014, InfraREIT LP entered into a new $75.0 million revolving credit facility, led by Bank of America, N.A., as administrative agent, with up to $15.0 million available for issuance of letters of credit and a maturity date of December 10, 2019. The revolving credit facility is secured by substantially all of the assets of the Operating Partnership, including the Operating Partnership’s equity interests in its subsidiary, Transmission and Distribution Company, LLC (TDC). In addition, TDC guarantees the revolving credit facility and this guarantee is secured by the assets of, and InfraREIT LP’s equity interests in, TDC. Upon consummation of the IPO and Merger, InfraREIT, Inc. became a guarantor under this revolving credit facility.
	The credit agreement requires InfraREIT LP to comply with coverage ratios on a consolidated basis and contains affirmative and negative covenants, including, but not limited to, limitations on additional debt, liens, investments, mergers, acquisitions, dispositions or entry into any line of business other than the business of the transmission and distribution of electric power and the provision of ancillary services and certain restrictions on the payment of dividends. The credit agreement also contains restrictions on the amount of Sharyland’s indebtedness and other restrictions on, and covenants applicable to, Sharyland.
	Borrowings and other extensions of credit under the revolving credit facility bear interest, at InfraREIT LP’s election, at a rate equal to (i) the one, two, three or six month London Interbank Offered Rate (LIBOR) plus 2.5%, or (ii) a base rate (equal to the highest of (A) the Federal Funds Rate plus ½ of 1%, (B) the Bank of America prime rate and (C) LIBOR plus 1%) plus 1.5%. Letters of credit are subject to a letter of credit fee equal to the daily amount available to be drawn times 2.5%. InfraREIT LP is also required to pay a commitment fee and other customary fees under the new revolving credit facility. InfraREIT LP may prepay amounts outstanding under the revolving credit facility in whole or in part without premium or penalty.
	There were no outstanding borrowings or letters of credit under the revolving credit facility at March 31, 2015 and there was $75.0 million borrowing capacity available. At December 31, 2014, there was $57.0 million outstanding at a 2.66% interest rate and no letters of credit outstanding with $18.0 million of remaining capacity under this revolving credit facility. As of March 31, 2015 and December 31, 2014, InfraREIT LP was in compliance with all debt covenants under this agreement.
	SDTS Credit Agreements
	On June 28, 2013, SDTS entered into a second amended and restated credit agreement led by Royal Bank of Canada, as administrative agent, which established a revolving credit facility of $75.0 million that originally matured on June 28, 2018 and included a letter of credit facility.
	On December 10, 2014, SDTS’s second amended and restated credit agreement was amended and restated in order to, among other things, increase the amount of the revolving credit facility to a total of $250.0 million and extend the maturity date to December 10, 2019. Up to $25.0 million of the revolving credit facility is available for issuance of letters of credit, and up to $5.0 million of the revolving facility is available for swingline loans. The revolving credit agreement is secured by substantially all of the assets of, and TDC’s equity interests in, SDTS on the same basis as the senior secured notes described below in Note 9, Long-Term Debt. SDTS’s equity interest in SDTS FERC, L.L.C. (SDTS FERC) is also pledged as security for the revolving credit facility.
	The interest rate for the revolving credit facility is based, at SDTS’s option, at a rate equal to either (1) a base rate, determined as the greatest of (A) the administrative agent’s prime rate, (B) the federal funds effective rate plus ½ of 1% and (C) LIBOR plus 1.00% per annum, plus a margin of either 0.75% or 1.00% per annum, depending on the total debt to capitalization ratio of SDTS on a consolidated basis or (2) LIBOR plus a margin of either 1.75% or 2.00% per annum, depending on the total debt to capitalization ratio of SDTS on a consolidated basis. SDTS is also required to pay a commitment fee and other customary fees under its revolving credit facility. SDTS is entitled to prepay amounts outstanding under the revolving credit facility with no prepayment penalty.
	There were no outstanding borrowing or letters of credit under the credit agreement at March 31, 2015 and there was $250.0 million borrowing capacity available. At December 31, 2014, there were $162.0 million outstanding at an effective interest rate of 1.91% with no letters of credit outstanding and $88.0 million capacity under this revolving credit facility. As of March 31, 2015 and December 31, 2014, SDTS was in compliance with all debt covenants under this agreement.
	The revolving credit facilities of InfraREIT LP and SDTS are subject to customary events of default. If an event of default occurs and is continuing, the required lenders may accelerate amounts due under each revolving credit facility (except in the case of a bankruptcy event of default, in which case such amounts will automatically become due and payable).

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Debt Instruments [Abstract]
Long-Term Debt	9	Long-Term Debt
	Long-term debt consisted of the following:
				31-Mar-15					31-Dec-14
	(In thousands)		Current	Amount			Interest		Amount			Interest
			Maturity Date	Outstanding			Rate		Outstanding			Rate
	Senior secured notes - $53.5 million		30-Dec-29	$	45,859			7.25%	$	46,291			7.25%
	Senior secured notes - $110.0 million		30-Sep-30		104,647			6.47%		105,622			6.47%
	Senior secured notes - $25.0 million		30-Dec-20		19,688			8.50%		20,000			8.50%
	Senior secured notes - $60.0 million		20-Jun-18		60,000			5.04%		60,000			5.04%
	Senior secured credit facilities - $407.0 million		20-Jun-18		394,790		2.43%*			397,843		2.42%*
					624,984					629,756
	Less current portion of long-term debt				(19,332	)				(19,234	)
	Debt classified as long-term debt			$	605,652				$	610,522
	*	Interest based on LIBOR at March 31, 2015 and December 31, 2014, respectively, plus an applicable margin.
	Senior Secured Notes – On December 31, 2009, SDTS issued $53.5 million aggregate principal amount of 7.25% per annum senior secured notes to The Prudential Insurance Company of America and affiliates. Principal and interest on the senior secured notes is payable quarterly and the senior secured notes are collateralized by SDTS’s T&D assets and the equity interests of SDTS and SDTS FERC.
	On July 13, 2010, in connection with the acquisition of Cap Rock Holding Corporation (Cap Rock), SDTS issued $110.0 million aggregate principal amount of 6.47% per annum senior secured notes to The Prudential Insurance Company of America. Principal and interest on the senior secured notes is payable quarterly and the senior secured notes are collateralized by SDTS’s T&D assets and the equity interests of SDTS and SDTS FERC.
	On July 13, 2010, in connection with the acquisition of Cap Rock, TDC issued $25.0 million aggregate principal amount of 8.5% per annum senior secured notes to The Prudential Insurance Company of America and affiliates. Principal and interest on the senior secured notes is payable quarterly and the senior secured notes are collateralized by the equity interest of TDC and certain accounts of TDC.
	SDTS and TDC are entitled to prepay amounts outstanding under the notes, subject to payment of a prepayment penalty equal to the excess of the discounted value of the remaining scheduled payments with respect to such notes over the amount of the prepaid notes.
	The senior secured note purchase agreements contain certain default triggers, including without limitation: failure to maintain compliance with financial and other covenants contained in the agreements, limitation on liens, investments and the incurrence of additional indebtedness. As of March 31, 2015 and December 31, 2014, SDTS and TDC were in compliance with all debt covenants under these agreements.
	Senior Secured Credit Facilities - On June 20, 2011, SPLLC entered into a construction term loan agreement consisting of a $667.0 million construction term loan, reduced to $447.0 million on March 8, 2013, syndicated broadly to a group of 14 international banks, and $60.0 million in fixed rate notes issued to The Prudential Insurance Company of America and affiliates. The senior secured credit facility is collateralized by SPLLC’s assets and SDTS’s equity interest in SPLLC.
	The $447.0 million construction term loan accrued interest at LIBOR plus 2.00%. LIBOR resets at each selected interest period (one, two, three or six months), at SPLLC’s discretion, at the current market rate. The outstanding borrowing under the construction term loan at December 31, 2013 was $396.0 million. On May 16, 2014, the construction term loan outstanding was converted into a term loan with a balance of $407.0 million. After this conversion, interest accrues at LIBOR plus 2.25% for a period of three years, at which point the interest rate will increase to LIBOR plus 2.50%. Interest under the loan is payable the last day of the selected interest period for interest periods of three months or less, and every three months for interest periods greater than three months. Amortized principal amounts of the term loan are payable quarterly after the conversion.
	Interest is payable quarterly on the $60.0 million fixed rate notes with the full principal balance due at maturity.
	The term loan agreement and fixed rate notes contain certain default triggers, including without limitation: failure to maintain compliance with financial and other covenants contained in the agreements, limitation on liens, investments and the incurrence of additional indebtedness. SPLLC was in compliance with all debt covenants for the term loan and fixed rate notes as of March 31, 2015 and December 31, 2014.

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	10	Derivative Instruments
	Interest – During 2011, SPLLC entered into an interest rate swap agreement designated as a cash flow hedge against variable interest rate exposure on a portion of the construction term loan which established a fixed rate on the LIBOR interest rates specified in the SPLLC construction term loan at 0.832% per annum until June 30, 2014. Notional amounts reset on a monthly basis and did not exceed $261.0 million at any given time. Notional amounts were $261.0 million as of March 31, 2014. This swap agreement terminated on June 30, 2014. We have not entered into any new derivative instruments since the termination of this swap agreement.
	This cash flow hedging instrument was recorded as a liability in the Consolidated Balance Sheets at fair value, with an offset to accumulated other comprehensive income to the extent the cash flow hedging instrument was effective. The cash flow hedging instrument gains and losses included in other comprehensive income were reclassified into earnings as the underlying transaction occurred. There was no cash flow hedging instrument ineffectiveness recorded for this swap agreement.
	The Company reclassified $0.4 million, included in other comprehensive income during the three months ended March 31, 2014 to interest expense, net on the Consolidated Statements of Operations.

Contingent_Consideration

Contingent Consideration	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Contingent Consideration	11	Contingent Consideration
	In connection with our acquisition of InfraREIT LP in 2010, we agreed to contingent consideration in the form of future deemed capital credits in an amount up to $82.5 million to Hunt-InfraREIT. The capital account credits, which were generated pro rata with our cash expenditures on the CREZ Project up to $737.0 million, were issued to Hunt-InfraREIT in the form of Class A OP Units at the agreed upon deemed issue price of $10.65 per unit on the first day of each quarter following the actual expenditures. The future deemed capital credits were determined to be contingent consideration and were assessed a fair value of $78.6 million at the date of acquisition and included as a component of long-term liabilities in the Consolidated Balance Sheets.
	As of December 31, 2014, InfraREIT LP had issued, as described above, approximately 6.7 million of Class A OP Units to Hunt-InfraREIT. During the three months ended March 31, 2015, the following transactions occurred:
	·	On January 1, 2015, InfraREIT LP issued 53,246 Class A OP Units to Hunt-InfraREIT.
	·	On February 4, 2015, in connection with the Reorganization, InfraREIT LP issued Hunt-InfraREIT 983,418 Common OP Units in full settlement of InfraREIT LP’s contingent consideration obligation.
	We recognized $0.6 million as expense due to changes in fair value of our contingent consideration in accordance with the acquisition agreement during the three months ended March 31, 2014. This expense was recorded as part of other (expense) income, net on the Consolidated Statements of Operations. There was no expense recorded during the three months ended March 31, 2015 related to our contingent consideration. As of December 31, 2014, $27.4 million was recorded as a current liability in the form of contingent consideration in the Consolidated Balance Sheets. As of March 31, 2015, no such liability was recorded as the contingent consideration was fully settled.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	12	Fair Value of Financial Instruments
	The carrying amounts of our cash and cash equivalents, restricted cash, due from affiliates and accounts payable approximate fair value due to the short-term nature of these assets and liabilities.
	Our derivative contracts consisted of cash flow hedging instruments which are not traded on a public exchange. The fair values of the cash flow hedging instrument contracts were determined using discounted cash flow techniques. The techniques incorporated Level 2 inputs and quotes from the counterparty to the interest swap contract. These market inputs were utilized in a discounted cash flow calculation considering the cash flow hedging instrument term, credit risk, notional amount and discount rate and were classified as Level 2 in the fair value hierarchy.
	As of March 31, 2015 and December 31, 2014, we had $394.8 million and $397.8 million, respectively, of borrowings under the construction term loan which accrued interest under floating interest rate structures. Accordingly, the carrying value of such indebtedness approximated fair value for the amounts outstanding.
	We also had borrowings totaling $230.2 million and $231.9 million under senior secured notes with a weighted average interest rate of 6.42% and 6.43% per annum as of March 31, 2015 and December 31, 2014, respectively. The fair value of these borrowings is estimated using discounted cash flow analysis based on current market rates.
	We assessed the fair market value of our contingent consideration associated with the acquisition of InfraREIT LP using observable Level 2 inputs at December 31, 2014.
	Financial instruments, measured at fair value, by level within the fair value hierarchy were as follows:
			Carrying		Fair Value
	(In thousands)		Value		Level 1		Level 2		Level 3
	31-Mar-15
	Long-term debt		$	624,984	$	—	$	659,445	$	—
	31-Dec-14
	Long-term debt		$	629,756	$	—	$	658,306	$	—
	Contingent consideration - long-term			27,378		—		27,378		—

Regulatory_Liability

Regulatory Liability	3 Months Ended
	Mar. 31, 2015
Regulatory Assets And Liabilities Disclosure [Abstract]
Regulatory Liability	13	Regulatory Liability
	Our regulatory liability is established through our depreciation rates related to cost of removal and represents amounts that we expect to incur in the future. As of March 31, 2015 and December 31, 2014, we recorded on the Consolidated Balance Sheets as a long-term liability $3.9 million and $1.2 million, respectively, net of actual removal costs incurred.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	14	Commitments and Contingencies
	The amounts reported as regulatory assets as of March 31, 2015 and December 31, 2014, are subject to the review by the PUCT and as with all utility assets may change at a later date based on that review, see Note 7, Deferred Assets and Other Regulatory Assets, net.
	We are not a party to any legal proceedings other than legal proceedings arising in the ordinary course of business. We do not believe the resolution of these proceedings, individually or in the aggregate, will have a material impact on our business, financial condition or results of operations, liquidity and cash flows.

Equity

Equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Equity	15	Equity
	On January 12, 2015, InfraREIT, Inc. amended its charter to increase the number of authorized common shares from 3,000 to 450,000,000. In addition, the par value of our common stock was reduced from $1 per share to $0.01 per share. Both the authorized number of common shares and the par value were unaffected by the Merger or Reorganization.
	On December 18, 2014, InfraREIT, L.L.C.’s board of directors approved a cash distribution by the Operating Partnership to all unit holders of record, including InfraREIT, L.L.C., on December 18, 2014 of $0.31 per unit for a total distribution of $14.1 million, $10.8 million of which was allocated to InfraREIT, L.L.C. Also on December 18, 2014, InfraREIT, L.L.C.’s board of directors approved a cash dividend to shareholders of record on December 18, 2014 of $0.31 per share for a total of $10.8 million. The cash distribution and cash dividend were paid on January 16, 2015. For federal income tax purposes, this distribution and dividend was classified as ordinary income.
	On January 13, 2015, InfraREIT, L.L.C.’s board of directors approved a cash distribution by the Operating Partnership to all unit holders of record, including InfraREIT, L.L.C., on January 20, 2015 of $0.26 per unit for a total distribution of $11.7 million, $9.0 million of which was allocated to InfraREIT, L.L.C. Also, on January 13, 2015, InfraREIT, L.L.C.’s board of directors approved a cash dividend to shareholders of record on January 20, 2015 of $0.26 per share for a total of $9.0 million. The cash distribution and cash dividend were paid on January 29, 2015. For federal income tax purposes, this distribution and dividend will be classified as ordinary income.
	On March 6, 2015, our board of directors approved a cash distribution by the Operating Partnership to all unit holders of record, including InfraREIT, Inc., on March 31, 2015 of $0.14 per unit for a total distribution of $8.5 million, $6.1 million of which was allocated to InfraREIT, Inc. Also, on March 6, 2015, our board of directors approved a cash dividend to shareholders of record on March 31, 2015 of $0.14 per share for a total of $6.1 million. The cash distribution and cash dividend were paid on April 23, 2015. For federal income tax purposes, this distribution and dividend will be classified as ordinary income.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Accumulated Other Comprehensive Loss	16	Accumulated Other Comprehensive Loss
	There were no changes in accumulated other comprehensive loss for the three months ended March 31, 2015. Changes in accumulated other comprehensive loss for the three months ended March 31, 2014 associated with the interest rate swap designated as a cash flow hedge was as follows:
	(In thousands)		Accumulated			Accumulated			Total
			Other			Other			Accumulated
			Comprehensive			Comprehensive			Other
			Loss			Loss			Comprehensive
			Attributable to			Attributable to			Loss
			InfraREIT, Inc.			Noncontrolling
						Interest
	Other comprehensive loss before		$	(37	)	$	(11	)	$	(48	)
	reclassifications
	Amounts reclassified from accumulated			341			102			443
	other comprehensive loss
	Net period other comprehensive loss		$	304		$	91		$	395

Noncontrolling_Interest

Noncontrolling Interest	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Noncontrolling Interest	17	Noncontrolling Interest
	We present as a noncontrolling interest the portion of any equity in entities that we control and consolidate but do not own. Generally, Common OP Units participate in net income allocations and distributions and entitle their holder the right, subject to the terms set forth in the partnership agreement, to require the Operating Partnership to redeem all or a portion of the Common OP Units held by such limited partner. At our option, we may satisfy this redemption with cash or by exchanging shares of InfraREIT, Inc. common stock on a one-for-one basis. Prior to the cancellation of all outstanding Class A OP Units, these units also participated in net income allocations and distributions and had the same redemption rights. As of March 31, 2015 and December 31, 2014, there were a total of 17.0 million and 10.7 million OP Units held by the limited partners of the Operating Partnership.
	On May 1, 2014, the limited partnership agreement of InfraREIT LP was amended in order to incorporate a long-term incentive plan and InfraREIT LP issued related OP Units (pre-IPO LTIP Units) to independent non-voting members of the InfraREIT, L.L.C. board of directors as part of their compensation, which were fully vested upon grant. During the three months ended March 31, 2015, an aggregate of 28,000 LTIP Units were issued by the Operating Partnership to seven of our directors which included a one year vesting period. We recognized $0.1 million of compensation expense as general and administrative expense in the Consolidated Statements of Operations during the three months ended March 31, 2015. There were no pre-IPO LTIP Units issued or compensation expense recognized during the three months ended March 31, 2014.
	We follow the guidance issued by the FASB regarding the classification and measurement of redeemable securities. Accordingly, we have determined that the Common OP Units meet the requirements to be classified as permanent equity. During the three months ended March 31, 2015, we did not redeem any OP Units other than, in connection with the Reorganization: (i) 1,551,878 Class A OP Units held by Hunt-InfraREIT, which were exchanged with InfraREIT, Inc. for 1,551,878 shares of common stock of InfraREIT, Inc. and (ii) 6,242,999 Class A OP Units in exchange for the assignment of a promissory note in the principal amount of $66.5 million. The Operating Partnership did not redeem any OP Units during the three months ended March 31, 2014.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	18	Earnings Per Share
	Basic earnings per share is calculated by dividing net earnings after noncontrolling interest by the weighted average shares outstanding. Diluted earnings per share is calculated similarly, except that it includes the dilutive effect of the assumed redemption of OP Units for shares on common stock of InfraREIT, Inc. or common shares of InfraREIT, L.L.C., as applicable, if such redemption were dilutive. The redemption of OP Units would have been anti-dilutive during the three months ended March 31, 2015 and 2014.
	Earnings per share are calculated as follows:
			Three Months Ended March 31,
	(In thousands, except per share data)		2015			2014
	Basic net income per share:
	Net (loss) income attributable to InfraREIT, Inc.		$	(26,873	)	$	3,845
	Weighted average common shares outstanding			41,204			35,053
	Basic net income per share		$	(0.65	)	$	0.11
	Diluted net income per share:
	Net (loss) income attributable to InfraREIT, Inc.		$	(26,873	)	$	3,845
	Weighted average common shares outstanding			41,204			35,053
	Redemption of operating partnership units			—			—
	Weighted average dilutive shares outstanding			41,204			35,053
	Diluted net income per share		$	(0.65	)	$	0.11
	Due to the anti-dilutive effect, the computation of diluted earnings
	per share does not reflect the following adjustments:
	Net (loss) income attributable to noncontrolling interest		$	(9,000	)	$	1,147
	Redemption of operating partnership units			13,801			10,421

Leases

Leases	3 Months Ended
	Mar. 31, 2015
Leases [Abstract]
Leases	19	Leases
	The following table shows the composition of our lease revenue:
			Three Months Ended March 31,
	(In thousands)		2015		2014
	Base rent (straight-line)		$	29,372	$	24,837
	Percentage rent			—		—
	Total lease revenue		$	29,372	$	24,837
	SDTS, SDTS FERC and SPLLC have entered into various leases with Sharyland and SU FERC for all of our placed in service T&D assets. The master lease agreements, as amended, expire at various dates from December 31, 2015 through December 31, 2022. Each agreement includes annual base rent while all but one agreement includes additional percentage rent (based on an agreed upon percentage of the gross revenue of Sharyland, as defined in the lease agreements, in excess of annual specified breakpoints, which decrease over the term of the agreements). The rate used for percentage rent varies by lease and ranges from a high of 37% to a low of 23% over the term of the agreements. Percentage rent was not recognized during the three months ended March 31, 2015 and 2014 as Sharyland’s revenue had not exceeded the annual specified breakpoints. Because an annual specified breakpoint must be met under our leases before we can recognize any percentage rent, we anticipate our revenue will grow over the year with little to no percentage rent recognized in the first quarter each year with the largest amounts recognized during the third and fourth quarters of each year.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	20	Supplemental Cash Flow Information
	Supplemental cash flow information and non-cash investing and financing activities are as follows:
			Three Months Ended March 31,
	(In thousands)		2015		2014
	Supplemental cash flow information
	Cash paid during the period for interest		$	7,081	$	7,330
	Cash paid during the period for taxes			—		75
	Non-cash investing and financing activities
	Non-cash right of way additions to electric plant			—		337
	Change in accrued additions to electric plant			12,106		30,039
	Allowance for funds used during construction - debt			408		396
	Non-cash members' contributions			—		91
	Net non-cash equity issuances related to the Merger and Reorganization			97,193		—
	Net non-cash noncontrolling equity issuances related to the Merger and Reorganization			119,607		—
	Non-cash noncontrolling interests contributions			—		27
	Non-cash noncontrolling interests equity issuance			755		2,467
	Dividends payable			6,099		—
	Distribution payable to noncontrolling interest			2,384		—

Description_of_Business_and_Pr1

Description of Business and Presentation of Financial Statements (Policies)	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	Description of Business
	We are the owners of electric transmission and distribution assets (T&D assets) throughout Texas, including the Texas Panhandle near Amarillo (Panhandle assets), the Permian Basin in and around Stanton, Central Texas around Brady, Northeast Texas in and around Celeste (S/B/C assets) and South Texas near McAllen (McAllen assets). InfraREIT, L.L.C. elected to be treated as a real estate investment trust (REIT) for U.S. federal income tax purposes commencing with the taxable year ended December 31, 2010, and InfraREIT, Inc. will elect to be taxed as a REIT commencing with the taxable year ending December 31, 2015. We are externally managed and advised by Hunt Utility Services, LLC (Hunt Manager), which is responsible for overseeing our day-to-day affairs, subject to the oversight of our board of directors.
Initial Public Offering and Reorganization	Initial Public Offering and Reorganization
	We completed our IPO on February 4, 2015, issuing 23,000,000 shares of common stock at a price of $23.00, resulting in gross proceeds of $529.0 million.
	Immediately after the closing of our IPO, we completed the Merger, with InfraREIT, L.L.C. merging with and into InfraREIT, Inc., and InfraREIT, Inc. as the surviving entity and general partner of the Operating Partnership. InfraREIT, Inc. used $172.4 million of the net proceeds from the IPO to fund the cash portion of the consideration issued in the Merger, as described in greater detail below. We contributed the remaining $323.2 million to the Operating Partnership in exchange for common OP Units (Common OP Units).
	The Operating Partnership used its net proceeds from the IPO that it received from InfraREIT, Inc.:
	·	to repay an aggregate of $1.0 million of indebtedness to HCI;
	·	to repay an aggregate of $72.0 million of indebtedness outstanding under the Operating Partnership’s revolving credit facility and $150.0 million of indebtedness outstanding under Sharyland Distribution & Transmission Services, L.L.C.’s (SDTS) revolving credit facility;
	·	to pay offering expenses (other than the underwriting discounts and commissions and the underwriter structuring fee) of $6.3 million; and
	·	for general corporate purposes.
	The following bullets describe the Merger and related transactions we effected in the first quarter of 2015 (collectively, the Reorganization).
	·	On January 29, 2015, the Operating Partnership effected a reverse unit split whereby each holder of OP Units received 0.938550 OP Units of the same class in exchange for each such unit it held immediately prior to such time, which is referred to as the unit split. Also, on January 29, 2015, InfraREIT, L.L.C. effected a reverse share split whereby each holder of shares received 0.938550 shares of the same class in exchange for each such share it held immediately prior to such time, which is referred to as the share split. All references to unit, share, per unit and per share amounts in these unaudited consolidated financial statements and related disclosures have been adjusted to reflect the reverse share split and reverse unit split for all periods presented.
	·	On January 29, 2015, InfraREIT, Inc. issued 1,700,000 shares of common stock to Hunt-InfraREIT, L.L.C. (Hunt-InfraREIT) as a non-cash reorganization advisory fee in accordance with the structuring fee agreement, resulting in our recognition of a $44.9 million non-cash expense in the first quarter of 2015.
	·	On February 4, 2015, the Operating Partnership issued 1,700,000 OP Units to InfraREIT, Inc. in respect of the structuring fee issuance of 1,700,000 shares of InfraREIT, Inc. common stock described immediately above.
	·	On February 4, 2015, the Operating Partnership issued an aggregate of 28,000 of its profit interest partnership units (LTIP Units) to seven of our directors.
	·	On February 4, 2015, the Operating Partnership issued 983,814 Common OP Units to Hunt-InfraREIT in settlement of the Operating Partnership’s obligation to issue OP Units to Hunt-InfraREIT related to the construction of transmission assets in the Texas Panhandle and Southern Plains (CREZ Project).
	·	On February 4, 2015, the Operating Partnership issued Hunt-InfraREIT 1,167,287 Common OP Units as an accelerated payment of a portion of the carried interest agreed to in 2010 in connection with the organization of InfraREIT, L.L.C. To effect the shift in ownership from the pre-IPO investors to Hunt-InfraREIT, an equal number of OP Units held by InfraREIT, L.L.C. in the Operating Partnership were cancelled at the same time.
	·	On February 4, 2015, as a result of the Merger, (1) holders of 8,000,000 common shares of InfraREIT, L.L.C. received $21.551 per common share, which was equal to the IPO price less the underwriting discounts and commissions and an underwriting structure fee, (2) holders of the remaining 19,617,755 common shares of InfraREIT, L.L.C. received 19,617,755 shares of InfraREIT, Inc. Class A common stock and (3) holders of 25,145 Class C shares of InfraREIT, L.L.C. received 25,145 shares of InfraREIT, Inc. Class C common stock.
	·	Marubeni, John Hancock Life Insurance Company (U.S.A), Teachers Insurance and Annuity Association of America, OpTrust Infrastructure N.A. Inc. (OpTrust) (collectively, founding investors) each received both cash and stock consideration in the Merger, and all other pre-IPO investors received shares of InfraREIT, Inc. Class A common stock or Class C common stock in the Merger. InfraREIT, L.L.C. gave each other holder of its common shares the opportunity to receive cash consideration in the Merger, and each such holder elected (or was deemed to have elected) to receive shares of Class A common stock under the merger agreement. All holders of InfraREIT, L.L.C.’s Class C common shares, as a separate class, received shares of Class C common stock pursuant to the merger agreement.
	·	On February 4, 2015, InfraREIT, Inc. contributed $323.2 million to the Operating Partnership in exchange for 15,000,000 Common OP Units.
	·	On February 4, 2015, InfraREIT, Inc. issued 1,551,878 shares of common stock to Hunt-InfraREIT in exchange for 1,551,878 OP Units tendered for redemption by Hunt-InfraREIT in accordance with a redemption agreement.
	·	On February 4, 2015, we purchased 6,242,999 common shares in consideration for the issuance of a promissory note to Westwood Trust in the principal amount of $66.5 million.
	·	Westwood Trust immediately transferred the promissory note to MC Transmission, and, immediately following receipt of the promissory note, MC Transmission purchased 3,325,874 Common OP Units from the Operating Partnership in consideration for the assignment of the promissory note. The promissory note was then transferred to InfraREIT, Inc. in exchange for the redemption of 6,242,999 OP Units held by InfraREIT, Inc. and the subsequent cancellation of such promissory note, resulting in no cash consideration being paid or received pursuant to the purchase from Westwood Trust or the sale of Common OP Units to MC Transmission.
	·	On March 9, 2015, the Operating Partnership issued 2,329,283 Common OP Units to Hunt-InfraREIT, and InfraREIT, Inc. canceled an equal number of shares of Class A common stock and Class C common stock. Each remaining share of Class A common stock and Class C common stock then converted to common stock on a one-for-one basis. This issuance settled InfraREIT, L.L.C.’s pre-IPO investors carried interest obligation agreed to by Hunt-InfraREIT under the investment documents entered into by the parties in 2010.
	·	On March 9, 2015, the 11,264 long-term incentive plan units issued to two of InfraREIT, L.L.C.’s non-voting directors in May 2014 converted on a one-to-one basis to Common OP Units.
Limited Partnership Agreement	Limited Partnership Agreement
	In connection with the Reorganization, we adopted a Second Amended and Restated Limited Partnership Agreement which became effective with the closing of our IPO. Upon completion of the IPO, the Operating Partnership had five types of OP Units outstanding: Common OP Units, Class A OP Units, Class B OP Units, Class C OP Units and LTIP Units.
	On March 9, 2015, the Operating Partnership issued Common OP Units in exchange for outstanding Class A OP Units and Class C OP Units. Such Common OP Units were allocated among the holders of Class A OP Units and Class C OP Units, and the Class A OP Units, Class B OP Units and Class C OP Units were cancelled. Following such allocation, we adopted a third amended and restated partnership agreement that eliminated the provisions related to the Reorganization and the description of the Class A OP Units, Class B OP Units and Class C OP Units; however, it continues to allow amendments to authorize and issue additional classes of OP Units in the future.
Basis of Presentation	Basis of Presentation
	The accompanying unaudited interim consolidated financial statements of InfraREIT, Inc. include our accounts and the accounts of all other entities in which we have a controlling financial interest with noncontrolling interest of consolidated subsidiaries reported separately. This Quarterly Report on Form 10-Q presents the operating results of InfraREIT, L.L.C. for the three months ended March 31, 2014 and the InfraREIT, L.L.C. balance sheet as of December 31, 2014. Our operating results for the three months ended March 31, 2015 reflect the operations of InfraREIT, L.L.C. prior to the effectiveness of the Merger, and the operations of InfraREIT, Inc. for the period from the Merger through March 31, 2015, and our balance sheet as of March 31, 2015 is the balance sheet of InfraREIT, Inc.
	These unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015.
	The Consolidated Balance Sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.
	For further information, refer to the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014, filed with the Securities and Exchange Commission on March 18, 2015.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In February 2015, the FASB issued Accounting Standard Update (ASU) 2015-02, Consolidation (Topic 810) – Amendments to the Consolidation Analysis. This amendment affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 is effective for periods beginning after December 15, 2015 with early adoption permitted. The adoption of the new guidance is not expected to have a material impact on our financial position, results of operations or cash flows.
	In April 2015, the FASB issued ASU 2015-03, Interest – Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. This ASU is effective for periods beginning after December 15, 2015 with early adoption permitted. When adopted, the new guidance will be applied on a retrospective basis with each balance sheet presented reflecting the new guidance along with transitional disclosures. The adoption is not expected to have a material impact on our financial position, results of operations or cash flows.

Prepaids_and_Other_Current_Ass1

Prepaids and Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Schedule Of Prepaid Expenses And Other Current Assets	Prepaids and other current assets are as follows:
	(In thousands)	31-Mar-15		31-Dec-14
	Offering costs	$	—	$	4,397
	Prepaid insurance		1,280		249
	Other		300		251
	Total prepaids and other current assets	$	1,580	$	4,897

Electric_Plant_and_Depreciatio1

Electric Plant and Depreciation (Tables)	3 Months Ended
	Mar. 31, 2015
Public Utilities Property Plant And Equipment [Abstract]
Schedule of Major Classes of Electric Plant	The major classes of electric plant are as follows:
	(In thousands)	31-Mar-15			31-Dec-14
	Electric plant:
	Transmission plant	$	970,993		$	966,560
	Distribution plant		399,361			387,329
	General plant		15,604			15,018
	Total plant in service		1,385,958			1,368,907
	CWIP		79,641			41,222
	Total electric plant		1,465,599			1,410,129
	Accumulated depreciation		(226,457	)		(220,101	)
	Electric plant held for future use		37,118			37,118
	Electric plant, net	$	1,276,260		$	1,227,146

Deferred_Assets_and_Other_Regu1

Deferred Assets and Other Regulatory Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Deferred Finance Costs And Other Regulatory Assets Net [Abstract]
Summary of Deferred Assets and Other Regulatory Assets, Net	Deferred assets and other regulatory assets, net are as follows:
		31-Mar-15							31-Dec-14
	(In thousands)	Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
		Amount					Amount		Amount					Amount
	Deferred financing costs	$	1,292	$	(199	)	$	1,093	$	1,290	$	(143	)	$	1,147
	Other regulatory assets:
	Deferred financing costs		25,748		(13,549	)		12,199		25,701		(12,693	)		13,008
	Deferred costs recoverable in future years		23,793		—			23,793		23,793		—			23,793
	Deferred financing costs and other regulatory	$	50,833	$	(13,748	)	$	37,085	$	50,784	$	(12,836	)	$	37,948
	assets, net

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Instruments [Abstract]
Components of Long-Term Debt	Long-term debt consisted of the following:
				31-Mar-15					31-Dec-14
	(In thousands)		Current	Amount			Interest		Amount			Interest
			Maturity Date	Outstanding			Rate		Outstanding			Rate
	Senior secured notes - $53.5 million		30-Dec-29	$	45,859			7.25%	$	46,291			7.25%
	Senior secured notes - $110.0 million		30-Sep-30		104,647			6.47%		105,622			6.47%
	Senior secured notes - $25.0 million		30-Dec-20		19,688			8.50%		20,000			8.50%
	Senior secured notes - $60.0 million		20-Jun-18		60,000			5.04%		60,000			5.04%
	Senior secured credit facilities - $407.0 million		20-Jun-18		394,790		2.43%*			397,843		2.42%*
					624,984					629,756
	Less current portion of long-term debt				(19,332	)				(19,234	)
	Debt classified as long-term debt			$	605,652				$	610,522
	*	Interest based on LIBOR at March 31, 2015 and December 31, 2014, respectively, plus an applicable margin.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Financial Instruments Measured at Fair Value	Financial instruments, measured at fair value, by level within the fair value hierarchy were as follows:
		Carrying		Fair Value
	(In thousands)	Value		Level 1		Level 2		Level 3
	31-Mar-15
	Long-term debt	$	624,984	$	—	$	659,445	$	—
	31-Dec-14
	Long-term debt	$	629,756	$	—	$	658,306	$	—
	Contingent consideration - long-term		27,378		—		27,378		—

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Changes in Accumulated Other Comprehensive Loss Associated with the Interest Rate Swap Designated as Cash Flow Hedge	There were no changes in accumulated other comprehensive loss for the three months ended March 31, 2015. Changes in accumulated other comprehensive loss for the three months ended March 31, 2014 associated with the interest rate swap designated as a cash flow hedge was as follows:
	(In thousands)	Accumulated			Accumulated			Total
		Other			Other			Accumulated
		Comprehensive			Comprehensive			Other
		Loss			Loss			Comprehensive
		Attributable to			Attributable to			Loss
		InfraREIT, Inc.			Noncontrolling
					Interest
	Other comprehensive loss before	$	(37	)	$	(11	)	$	(48	)
	reclassifications
	Amounts reclassified from accumulated		341			102			443
	other comprehensive loss
	Net period other comprehensive loss	$	304		$	91		$	395

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share are calculated as follows:
		Three Months Ended March 31,
	(In thousands, except per share data)	2015			2014
	Basic net income per share:
	Net (loss) income attributable to InfraREIT, Inc.	$	(26,873	)	$	3,845
	Weighted average common shares outstanding		41,204			35,053
	Basic net income per share	$	(0.65	)	$	0.11
	Diluted net income per share:
	Net (loss) income attributable to InfraREIT, Inc.	$	(26,873	)	$	3,845
	Weighted average common shares outstanding		41,204			35,053
	Redemption of operating partnership units		—			—
	Weighted average dilutive shares outstanding		41,204			35,053
	Diluted net income per share	$	(0.65	)	$	0.11
	Due to the anti-dilutive effect, the computation of diluted earnings
	per share does not reflect the following adjustments:
	Net (loss) income attributable to noncontrolling interest	$	(9,000	)	$	1,147
	Redemption of operating partnership units		13,801			10,421

Leases_Tables

Leases (Tables)	3 Months Ended
	Mar. 31, 2015
Leases [Abstract]
Schedule of Composition of Lease Revenue	The following table shows the composition of our lease revenue:
		Three Months Ended March 31,
	(In thousands)	2015		2014
	Base rent (straight-line)	$	29,372	$	24,837
	Percentage rent		—		—
	Total lease revenue	$	29,372	$	24,837

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information(Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information and Non-cash Investing and Financing Activities	Supplemental cash flow information and non-cash investing and financing activities are as follows:
		Three Months Ended March 31,
	(In thousands)	2015		2014
	Supplemental cash flow information
	Cash paid during the period for interest	$	7,081	$	7,330
	Cash paid during the period for taxes		—		75
	Non-cash investing and financing activities
	Non-cash right of way additions to electric plant		—		337
	Change in accrued additions to electric plant		12,106		30,039
	Allowance for funds used during construction - debt		408		396
	Non-cash members' contributions		—		91
	Net non-cash equity issuances related to the Merger and Reorganization		97,193		—
	Net non-cash noncontrolling equity issuances related to the Merger and Reorganization		119,607		—
	Non-cash noncontrolling interests contributions		—		27
	Non-cash noncontrolling interests equity issuance		755		2,467
	Dividends payable		6,099		—
	Distribution payable to noncontrolling interest		2,384		—

Description_of_Business_and_Pr2

Description of Business and Presentation of Financial Statements - Additional Information (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Feb. 04, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 09, 2015	Dec. 31, 2014	Jan. 29, 2015
	Director
Description Of Business And Presentation Of Financial Statements [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
Realized gain on sale of marketable securities		66,000
Percentage of partnership units outstanding		71.90%
Common stock, shares issued under IPO		43,565,495
Net proceeds from issuance of common stock upon initial public offering	172,400,000	493,722,000
Contributed to the operating partnership	323,200,000		1,171,000
Offering expenses		6,300,000
Number of directors	7
Members capital, shares issued					35,053,186
Common Class A
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received	19,617,755
Common Class C
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received	25,145
LTIP Units
Description Of Business And Presentation Of Financial Statements [Line Items]
Operating partnership issued	28,000
Revolving Credit Facility
Description Of Business And Presentation Of Financial Statements [Line Items]
Repayments of outstanding revolving credit facility		72,000,000
Sharyland Distribution & Transmission Services | Revolving Credit Facility
Description Of Business And Presentation Of Financial Statements [Line Items]
Repayments of outstanding revolving credit facility		150,000,000
InfraREIT, L.L.C.
Description Of Business And Presentation Of Financial Statements [Line Items]
Common stock, shares issued under IPO	1,700,000
Common stock sold under IPO, per share	$21.55
Contributed to the operating partnership	323,200,000
Partners capital received	8,000,000
Members capital, shares issued	15,000,000
Common stock conversion basis		one-for-one basis
InfraREIT, L.L.C. | Common Class A
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received	19,617,755
InfraREIT, L.L.C. | Common Class C
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received	25,145
InfraREIT, L.L.C. | LTIP Units
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received				11,264
Common stock conversion basis		one-to-one basis
InfraREIT, L.L.C. | Operating Partnership Unit
Description Of Business And Presentation Of Financial Statements [Line Items]
Reverse share split						0.93855
Hunt-InfraREIT
Description Of Business And Presentation Of Financial Statements [Line Items]
Common stock, shares issued under IPO	1,551,878					1,700,000
Non-cash expense		44,900,000
Operating partnership issued	1,167,287
Common shares received				2,329,283
Hunt-InfraREIT | CREZ Project
Description Of Business And Presentation Of Financial Statements [Line Items]
Operating partnership issued	983,814
Hunt-InfraREIT | Operating Partnership Unit
Description Of Business And Presentation Of Financial Statements [Line Items]
Common shares received	1,551,878
MC Transmission Holdings Inc. | Operating Partnership Unit
Description Of Business And Presentation Of Financial Statements [Line Items]
Shares purchased consideration for promissory note	3,325,874
Initial Public Offering
Description Of Business And Presentation Of Financial Statements [Line Items]
Common stock, shares issued under IPO	23,000,000
Common stock sold under IPO, per share	$23
Net proceeds from issuance of common stock upon initial public offering	529,000,000
Hunt Consolidated Incorporation
Description Of Business And Presentation Of Financial Statements [Line Items]
Percentage of partnership units outstanding		28.10%
Repayments of related party debt		1,000,000
Westwood Trust
Description Of Business And Presentation Of Financial Statements [Line Items]
Shares purchased consideration for promissory note	6,242,999
Principal amount of shares purchased consideration for promissory note	$66,500,000

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Details) (USD $)	3 Months Ended		12 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2016	Feb. 28, 2015	Dec. 31, 2014	Jan. 15, 2015	Nov. 20, 2014
Related Party Transaction [Line Items]
Lease revenue	$29,372,000	$24,837,000
Due from affiliates	21,039,000		21,039,000			27,822,000
Payments to acquire plant, and equipment	67,210,000	65,493,000
Accounts payable and accrued liabilities	13,785,000		13,785,000			25,295,000
Members capital, shares issued						35,053,186
Management fee	2,500,000	1,300,000
Prepaid management fee	0		0			0
Accrued management fee	0		0			0
Secondment fees		100,000
Total purchase price of assets sold						41,211,000
Hunt Manager
Related Party Transaction [Line Items]
Management fee			10,000,000
Reimbursement of annual software license and maintenance fees	200,000	200,000
Effective date of management agreement	4-Feb-15
Management agreement expiration date	31-Dec-19
Agreement successive renewal terms	5 years
Management fee, description	The base fee for each twelve month period beginning April 1 thereafter will equal 1.50% of our total equity as of December 31 of the immediately preceding year, subject to a $30.0 million cap
Investment management fee equity multiplier	1.50%		1.50%
Management fee cap	30,000,000		30,000,000
Hunt Manager | Scenario, Forecast
Related Party Transaction [Line Items]
Management fee				13,100,000
Hunt Consolidated, Inc. and affiliates | Cross Valley and GSEC
Related Party Transaction [Line Items]
Total purchase price of assets sold							41,200,000
Sharyland
Related Party Transaction [Line Items]
Lease revenue	29,400,000	24,800,000
Payments to acquire plant, and equipment	67,400,000	46,400,000
Accounts payable and accrued liabilities	4,100,000		4,100,000			16,100,000
Hunt-InfraREIT
Related Party Transaction [Line Items]
Percentage of capital expenditure agreed to issue upon operating partnership units	5.00%
Hunt-InfraREIT | Class A OP Units
Related Party Transaction [Line Items]
Shares issued price per share	$10.65		$10.65
Members capital, shares issued	17,600	31,088	17,600
Hunt And Affiliated Entity
Related Party Transaction [Line Items]
Aggregate legal fees	5,000,000
Hunt Consolidated Incorporation
Related Party Transaction [Line Items]
Borrowings from related parties								1,000,000
Accrued interest bearing note								2.50%
Interest bearing note, maturity date	1-Nov-15
Interest bearing note, maturity date, description	This note and accrued interest was repaid in February 2015 with proceeds from our IPO for a total of $1.0 million
Repayments of related party debt					$1,000,000

Assets_Held_for_Sale_Additiona

Assets Held for Sale - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Jan. 15, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale		$41,211,000
Depreciation		0
Minimum Development Agreement Period	90 days
Cross Valley
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale			34,200,000
GSEC
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale			$7,000,000

Prepaids_and_Other_Current_Ass2

Prepaids and Other Current Assets - Summary of Prepaids and Other Current Assets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Prepaid Expense And Other Assets Current [Abstract]
Offering costs		$4,397
Prepaid insurance	1,280	249
Other	300	251
Total prepaids and other current assets	$1,580	$4,897

Prepaids_and_Other_Current_Ass3

Prepaids and Other Current Assets - Additional Information (Details) (USD $)	15 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Prepaid And Other Current Assets [Line Items]
Offering costs		$4,397,000
Initial Public Offering
Prepaid And Other Current Assets [Line Items]
Aggregate offering costs	6,300,000
Offering costs		$4,400,000

Electric_Plant_and_Depreciatio2

Electric Plant and Depreciation - Schedule of Major Classes of Electric Plant (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Electric plant:
Transmission plant	$970,993	$966,560
Distribution plant	399,361	387,329
General plant	15,604	15,018
Total plant in service	1,385,958	1,368,907
CWIP	79,641	41,222
Total electric plant	1,465,599	1,410,129
Accumulated depreciation	-226,457	-220,101
Electric plant held for future use	37,118	37,118
Electric plant, net	$1,276,260	$1,227,146

Electric_Plant_and_Depreciatio3

Electric Plant and Depreciation - Additional Information (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Dec. 30, 2013	Mar. 31, 2015	Dec. 31, 2014
	mi
Public Utility Property Plant And Equipment [Line Items]
Electric plant, net includes plant acquisition adjustments		$28.90	$28.70
Electric Plant Held For Future Use
Public Utility Property Plant And Equipment [Line Items]
Electric plant, transmission lines	66
Electric Plant Held For Future Use | Stanton
Public Utility Property Plant And Equipment [Line Items]
Number of substations	2

Goodwill_Details

Goodwill (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$138,384	$138,384

Deferred_Assets_and_Other_Regu2

Deferred Assets and Other Regulatory Assets, Net - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 10, 2014
Deferred Finance Costs And Other Regulatory Assets Net [Line Items]
Issuance of aggregate principal amount	$25,000,000
Deferred costs recoverable in future years	23,793,000	23,793,000
Sharyland Distribution & Transmission Services
Deferred Finance Costs And Other Regulatory Assets Net [Line Items]
Credit facility, maximum borrowing capacity	250,000,000
Revolving Credit Facility | Sharyland Distribution & Transmission Services
Deferred Finance Costs And Other Regulatory Assets Net [Line Items]
Credit facility, maximum borrowing capacity			$250,000,000
Senior Notes
Deferred Finance Costs And Other Regulatory Assets Net [Line Items]
Long-term debt, stated interest rate	8.50%

Deferred_Assets_and_Other_Regu3

Deferred Assets and Other Regulatory Assets, Net - Summary of Deferred Assets and Other Regulatory Assets, Net (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Deferred Finance Costs And Other Regulatory Assets Net [Abstract]
Deferred financing costs, Gross Carrying Amount	$1,292	$1,290
Other regulatory assets Deferred financing costs, Gross Carrying Amount	25,748	25,701
Deferred costs recoverable in future years	23,793	23,793
Deferred financing costs and other regulatory assets, Net Gross Carrying Amount	50,833	50,784
Deferred financing costs, Accumulated Amortization	-199	-143
Other regulatory assets Deferred financing costs, Accumulated Amortization	-13,549	-12,693
Deferred financing costs and other regulatory assets, Net Accumulated Amortization	-13,748	-12,836
Deferred financing costs, Net Carrying Amount	1,093	1,147
Other regulatory assets Deferred financing costs, Net Carrying Amount	12,199	13,008
Deferred costs recoverable in future years, Net Carrying Amount	23,793	23,793
Deferred financing costs and other regulatory assets, Net Carrying Amount	$37,085	$37,948

Borrowings_Under_Credit_Facili1

Borrowings Under Credit Facilities - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 10, 2014	Jan. 03, 2014	Jun. 28, 2013
Line Of Credit Facility [Line Items]
Amount of revolving credit facility under agreement	$0	$57,000,000
Line of credit facility, remaining borrowing capacity	75,000,000	18,000,000
Revolving credit facility, interest rate description	a rate equal to (i) the one, two, three or six month London Interbank Offered Rate (LIBOR) plus 2.5%, or (ii) a base rate (equal to the highest of (A) the Federal Funds Rate plus B= of 1%, (B) the Bank of America prime rate and (C) LIBOR plus 1%) plus 1.5%. Letters of credit are subject to a letter of credit fee equal to the daily amount available to be drawn times 2.5%.
Interest rate on credit facility		2.66%
SDTS Credit Agreements
Line Of Credit Facility [Line Items]
Amount of revolving credit facility under agreement	0	162,000,000
Revolving credit facility, interest rate description	a rate equal to either (1) a base rate, determined as the greatest of (A) the administrative agentbs prime rate, (B) the federal funds effective rate plus B= of 1% and (C) LIBOR plus 1.00% per annum, plus a margin of either 0.75% or 1.00% per annum, depending on the total debt to capitalization ratio of SDTS on a consolidated basis or (2) LIBOR plus a margin of either 1.75% or 2.00% per annum
Interest rate on credit facility		1.91%
Credit facility, maximum borrowing capacity	250,000,000
SDTS Credit Agreements | Swingline Loans
Line Of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity			5,000,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Amount of revolving credit facility under agreement				130,000,000
Credit facility, maturity date	31-Mar-15
Revolving Credit Facility | SDTS Credit Agreements
Line Of Credit Facility [Line Items]
Amount of revolving credit facility under agreement					75,000,000
Credit facility, maturity date	28-Jun-18
Line of credit facility, remaining borrowing capacity		88,000,000	25,000,000
Credit facility, maximum borrowing capacity			250,000,000
Credit facility, extended maturity date	10-Dec-19
New Revolving Credit Facility
Line Of Credit Facility [Line Items]
Amount of revolving credit facility under agreement			75,000,000
Credit facility, maturity date	10-Dec-19
Line of credit facility, remaining borrowing capacity			$15,000,000

LongTerm_Debt_Components_of_Lo

Long-Term Debt - Components of Long-Term Debt (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, Amount Outstanding	$624,984	$629,756
Less current portion of long-term debt	-19,332	-19,234
Debt classified as long-term debt	605,652	610,522
Senior Secured Notes, 7.25% [Member]
Debt Instrument [Line Items]
Interest bearing note, maturity date	30-Dec-29
Long-term debt, Amount Outstanding	45,859	46,291
Long-term debt, Interest Rate	7.25%	7.25%
Senior Secured Notes, 6.47% [Member]
Debt Instrument [Line Items]
Interest bearing note, maturity date	30-Sep-30
Long-term debt, Amount Outstanding	104,647	105,622
Long-term debt, Interest Rate	6.47%	6.47%
Senior Secured Notes, 8.50% [Member]
Debt Instrument [Line Items]
Interest bearing note, maturity date	30-Dec-20
Long-term debt, Amount Outstanding	19,688	20,000
Long-term debt, Interest Rate	8.50%	8.50%
Senior Secured Notes, 5.04% [Member]
Debt Instrument [Line Items]
Interest bearing note, maturity date	20-Jun-18
Long-term debt, Amount Outstanding	60,000	60,000
Long-term debt, Interest Rate	5.04%	5.04%
Senior Secured Credit Facilities, 2.42% [Member]
Debt Instrument [Line Items]
Interest bearing note, maturity date	20-Jun-18
Long-term debt, Amount Outstanding	$394,790	$397,843
Long-term debt, Interest Rate	2.43%	2.42%

LongTerm_Debt_Components_of_Lo1

Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Long-term debt, face amount	$25
Senior Secured Notes, 7.25% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	53.5
Senior Secured Notes, 6.47% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	110
Senior Secured Notes, 8.50% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	25
Senior Secured Notes, 5.04% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	60
Senior Secured Credit Facilities, 2.42% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	$407

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Details) (USD $)	0 Months Ended		3 Months Ended
	16-May-14	Mar. 08, 2013	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2009	Jul. 13, 2010	Dec. 31, 2013	Jun. 20, 2011
		Bank
Debt Instrument [Line Items]
Long-term debt, face amount			25,000,000
Borrowing outstanding under construction term loan			624,984,000	629,756,000
Senior Secured Notes, 7.25% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount			53,500,000
Long-term debt, stated interest rate			7.25%	7.25%
Borrowing outstanding under construction term loan			45,859,000	46,291,000
Senior Secured Notes, 6.47% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount			110,000,000
Long-term debt, stated interest rate			6.47%	6.47%
Borrowing outstanding under construction term loan			104,647,000	105,622,000
Senior Secured Notes, 8.50% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount			25,000,000
Long-term debt, stated interest rate			8.50%	8.50%
Borrowing outstanding under construction term loan			19,688,000	20,000,000
SDTS Credit Agreements | Senior Secured Notes, 7.25% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount					53,500,000
Long-term debt, stated interest rate					7.25%
SDTS Credit Agreements | Senior Secured Notes, 6.47% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount						110,000,000
Long-term debt, stated interest rate						6.47%
TDC [Member] | Senior Secured Notes, 8.50% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount						25,000,000
Long-term debt, stated interest rate						8.50%
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, face amount		60,000,000
Construction-term loan		447,000,000						667,000,000
Number of banks, providing construction-term loan		14
Borrowing outstanding under construction term loan							396,000,000
Construction term loan outstanding converted into term loan	$407,000,000
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate			2.00%
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member] | Period of Three Years [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate			2.25%
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member] | Period After Three Years [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate			2.50%

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Derivatives Fair Value [Line Items]
Amount reclassified, interest expense	$400,000
Sharyland Projects, L.L.C [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Derivative, notional amount	$261,000,000
Sharyland Projects, L.L.C [Member] | LIBOR [Member]
Derivatives Fair Value [Line Items]
Term loan, fixed interest rate	0.83%

Contingent_Consideration_Addit

Contingent Consideration - Additional Information (Details) (USD $)	3 Months Ended		1 Months Ended	0 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2010	Feb. 04, 2015	Jan. 01, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Change in fair value of contingent consideration	$0	$612,000
Contingent consideration	0					27,378,000
CREZ Project
Business Acquisition [Line Items]
Business combination, contingent consideration, cash payments			737,000,000
Business combination, contingent consideration, fair value			78,600,000
Hunt-InfraREIT
Business Acquisition [Line Items]
Business combination, contingent consideration, capital credits			$82,500,000
Hunt-InfraREIT | Operating Partnership Unit
Business Acquisition [Line Items]
Shares issued				983,418
Hunt-InfraREIT | Class A Partnership Units
Business Acquisition [Line Items]
Shares issued					53,246	6,700,000
Hunt-InfraREIT | CREZ Project | Class A Partnership Units
Business Acquisition [Line Items]
Shares issued price per share			$10.65

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under construction term loan	$394,800,000	$397,800,000
Long-Term Debt	605,652,000	610,522,000
Senior Secured Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-Term Debt	$230,200,000	$231,900,000
Debt Instrument, weighted average rate	6.42%	6.43%

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt, Carrying Value	$624,984,000	$629,756,000
Contingent consideration	0	27,378,000
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt, Fair Value	659,445,000	658,306,000
Contingent consideration - long-term, Fair Value		$27,378,000

Regulatory_Liability_Additiona

Regulatory Liability - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Regulated Operations [Abstract]
Regulatory Liability	$3,941	$1,242

Equity_Additional_Information_

Equity - Additional Information (Details) (USD $)	3 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 18, 2014	Mar. 31, 2015	Jan. 13, 2015	Mar. 06, 2015	Jan. 12, 2015	Jan. 11, 2015
Class Of Stock [Line Items]
Common stock, shares authorized	450,000,000		450,000,000			450,000,000	3,000
Common stock, par or stated value per share	$0.01		$0.01			$0.01	$1
Cash dividends declared per share to shareholders	$0.40
Cash Distribution Approved on December 18, 2014
Class Of Stock [Line Items]
Cash distribution declaration date	18-Dec-14
Cash distributions to unit holders, date of record	18-Dec-14
Dividends Payable, date declared	18-Dec-14
Dividends payable date of record	18-Dec-14
Cash dividends declared per share to shareholders		$0.31
Cash distribution and dividend paid date	16-Jan-15
Cash Distribution Approved on December 18, 2014 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash distributions declared to unit holders, per unit		$0.31
Cash distribution to unit holders			$14.10
Cash Distribution Approved on January 13, 2015
Class Of Stock [Line Items]
Cash distribution declaration date	13-Jan-15
Cash distributions to unit holders, date of record	20-Jan-15
Dividends Payable, date declared	13-Jan-15
Dividends payable date of record	20-Jan-15
Cash dividends declared per share to shareholders				$0.26
Cash distribution and dividend paid date	29-Jan-15
Cash Distribution Approved on January 13, 2015 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash distributions declared to unit holders, per unit				$0.26
Cash distribution to unit holders	11.7
Cash Distribution Approved on March 6, 2015
Class Of Stock [Line Items]
Cash distribution declaration date	6-Mar-15
Cash distributions to unit holders, date of record	31-Mar-15
Dividends Payable, date declared	6-Mar-15
Dividends payable date of record	31-Mar-15
Cash dividends declared per share to shareholders					$0.14
Cash distribution and dividend paid date	23-Apr-15
Cash Distribution Approved on March 6, 2015 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash distributions declared to unit holders, per unit					$0.14
Cash distribution to unit holders	8.5
Retained Earnings | Cash Distribution Approved on December 18, 2014
Class Of Stock [Line Items]
Cash dividends declared to shareholders	10.8
Retained Earnings | Cash Distribution Approved on December 18, 2014 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash dividends declared to shareholders			10.8
Retained Earnings | Cash Distribution Approved on January 13, 2015
Class Of Stock [Line Items]
Cash dividends declared to shareholders	9
Retained Earnings | Cash Distribution Approved on January 13, 2015 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash dividends declared to shareholders	9
Retained Earnings | Cash Distribution Approved on March 6, 2015
Class Of Stock [Line Items]
Cash dividends declared to shareholders	6.1
Retained Earnings | Cash Distribution Approved on March 6, 2015 | InfraREIT, L.L.C.
Class Of Stock [Line Items]
Cash dividends declared to shareholders	$6.10

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Additional Information (Details) (USD $)	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Changes in accumulated other comprehensive loss	$0

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	($48)
Amounts reclassified from accumulated other comprehensive loss	443
Net period other comprehensive loss	395
Accumulated Other Comprehensive Loss Attributable to InfraREIT, Inc.
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	-37
Amounts reclassified from accumulated other comprehensive loss	341
Net period other comprehensive loss	304
Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	-11
Amounts reclassified from accumulated other comprehensive loss	102
Net period other comprehensive loss	$91

Noncontrolling_Interest_Additi

Noncontrolling Interest - Additional Information (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 09, 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	17,000,000			10,700,000
Operating partnership units redeem	0	0
General and Administrative Expense
Minority Interest [Line Items]
Compensation Expenses	100,000	0
LTIP Units
Minority Interest [Line Items]
Operating partnership units issued	28,000	0
Directors vesting period	1 year
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
Common shares received	1,551,878

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Earnings Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Basic net income per share:
Net (loss) income attributable to InfraREIT, Inc.	($26,873)	$3,845
Weighted average common shares outstanding	41,204,000	35,053,000
Basic net income per share	($0.65)	$0.11
Diluted net income per share:
Net (loss) income attributable to InfraREIT, Inc.	-26,873	3,845
Weighted average common shares outstanding	41,204,000	35,053,000
Redemption of operating partnership units	0	0
Weighted average dilutive shares outstanding	41,204,000	35,053,000
Diluted net income per share	($0.65)	$0.11
Due to the anti-dilutive effect, the computation of diluted earnings per share does not reflect the following adjustments:
Net (loss) income attributable to noncontrolling interest	($9,000)	$1,147
Redemption of operating partnership units	13,801,000	10,421,000

Leases_Schedule_of_Composition

Leases - Schedule of Composition of Lease Revenue (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Leases [Abstract]
Base rent (straight-line)	$29,372	$24,837
Total lease revenue	$29,372	$24,837

Leases_Additional_Information_

Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Leased Assets [Line Items]
Operating leases placed in services dates description	SDTS, SDTS FERC and SPLLC have entered into various leases with Sharyland and SU FERC for all of our placed in service T&D assets. The master lease agreements, as amended, expire at various dates from December 31, 2015 through December 31, 2022.
Maximum [Member]
Operating Leased Assets [Line Items]
Additional rent, percentage	37.00%
Minimum [Member]
Operating Leased Assets [Line Items]
Additional rent, percentage	23.00%
Sharyland
Operating Leased Assets [Line Items]
Percentage of rent recognized	0.00%	0.00%

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information -Supplemental Cash Flow Information and Non-cash Investing and Financing Activities (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Supplemental cash flow information
Cash paid during the period for interest	$7,081	$7,330
Cash paid during the period for taxes		75
Non-cash investing and financing activities
Non-cash right of way additions to electric plant		337
Change in accrued additions to electric plant	12,106	30,039
Allowance for funds used during construction - debt	408	396
Non-cash members' contributions		91
Net non-cash equity issuances related to the Merger and Reorganization	97,193
Net non-cash noncontrolling equity issuances related to the Merger and Reorganization	119,607
Non-cash noncontrolling interests contributions		27
Non-cash noncontrolling interests equity issuance	755	2,467
Dividends payable	6,099
Distribution payable to noncontrolling interest	$2,384