Tallgrass Energy Partners 10-Q 11 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 Information [Line Items]
Entity Registrant Name	TALLGRASS ENERGY PARTNERS, LP
Entity Central Index Key	1569134
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Trading Symbol	TEP
Amendment Flag	FALSE
Common Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		60,234,105
General Partner Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		834,391

CONDENSED_BALANCE_SHEETS_UNAUD

CONDENSED BALANCE SHEETS (UNAUDITED) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$876,000	$867,000
Accounts receivable, net	46,268,000	39,768,000
Receivable from related party	0	73,393,000
Gas imbalances	911,000	2,442,000
Inventories	12,679,000	13,045,000
Derivative assets at fair value	90,000	0
Prepayments and other current assets	2,728,000	2,766,000
Total Current Assets	63,552,000	132,281,000
Property, plant and equipment, net	1,921,676,000	1,853,081,000
Goodwill	343,288,000	343,288,000
Intangible asset, net	102,519,000	104,538,000
Deferred financing costs	5,119,000	5,528,000
Deferred charges and other assets	17,397,000	18,481,000
Total Assets	2,453,551,000	2,457,197,000
Current Liabilities:
Accounts payable, including $41,363 and $45,534 related to variable interest entities	64,047,000	62,329,000
Accounts payable to related parties	3,000,000	3,915,000
Gas imbalances	3,490,000	3,611,000
Accrued taxes	15,308,000	3,989,000
Accrued liabilities	6,447,000	9,384,000
Other current liabilities	12,094,000	13,340,000
Total Current Liabilities	104,386,000	96,568,000
Long-term debt	698,000,000	559,000,000
Other long-term liabilities and deferred credits	6,213,000	6,478,000
Total Long-term Liabilities	704,213,000	565,478,000
Commitments and Contingencies
Equity:
General partner (834,391 units issued and outstanding at March 31, 2015 and December 31, 2014)	-357,145,000	-35,743,000
Total Partners’ Equity	1,273,302,000	1,038,723,000
Noncontrolling interests	371,650,000	756,428,000
Total Equity	1,644,952,000	1,795,151,000
Total Liabilities and Equity	2,453,551,000	2,457,197,000
Common unitholders
Equity:
Unitholders	1,630,447,000	800,333,000
Subordinated unitholder
Equity:
Unitholders	$0	$274,133,000

CONDENSED_BALANCE_SHEETS_UNAUD1

CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Accounts payable, including $41,363 and $45,534 related to variable interest entities	$64,047,000	$62,329,000
General partner units issued (in shares)	834,391	834,391
General partner units outstanding (in shares)	834,391	834,391
Common unitholders
Unitholders units issued (in shares)	60,234,105	32,834,105
Unitholders units outstanding (in shares)	60,234,105	82,834,105
Subordinated unitholder
Unitholders units issued (in shares)	0	16,200,000
Unitholders units outstanding (in shares)	0	16,200,000
Variable Interest Entity, Primary Beneficiary [Member]
Accounts payable, including $41,363 and $45,534 related to variable interest entities	$41,363	$45,534

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Natural gas liquids sales	$21,025	$48,907
Natural gas sales	844	4,808
Natural gas transportation services	32,148	34,104
Crude oil transportation services	50,381	0
Processing and other revenues	10,277	6,960
Total Revenues	114,675	94,779
Operating Costs and Expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	19,593	48,206
Cost of transportation services (exclusive of depreciation and amortization shown below)	10,715	5,117
Operations and maintenance	9,575	8,013
Depreciation and amortization	20,605	8,309
General and administrative	12,689	6,649
Taxes, other than income taxes	11,297	1,956
Loss on sale of assets	4,483	0
Total Operating Costs and Expenses	88,957	78,250
Operating Income	25,718	16,529
Other (Expense) Income:
Interest expense, net	-3,440	-1,296
Equity in earnings of unconsolidated investment	0	444
Other income, net	712	940
Total Other (Expense) Income	-2,728	88
Net Income	22,990	16,617
Net loss attributable to noncontrolling interests	-9,329	-507
Net income attributable to partners	32,319	17,124
Net loss attributable to noncontrolling interests
Predecessor operations interest in net income	0	-4,224
Basic net income per common and subordinated unit	-7,438	-382
Diluted net income per common and subordinated unit	$24,881	$12,518
Basic average number of common and subordinated units outstanding	$0.47	$0.31
Diluted average number of common and subordinated units outstanding	$0.46	$0.30
Basic average number of common and subordinated units outstanding	52,727	40,500
Diluted average number of common and subordinated units outstanding	53,994	41,272

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$22,990	$16,617
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	21,557	8,638
Noncash compensation expense	1,527	941
Loss on sale of assets	4,483	0
Changes in components of working capital:
Accounts receivable and other	-5,678	1,356
Gas imbalances	143	321
Inventories	-2,754	-887
Accounts payable and accrued liabilities	6,546	-6,623
Other operating, net	-175	7,240
Net Cash Provided by Operating Activities	-48,639	-27,603
Cash Flows from Investing Activities:
Capital expenditures	-13,300	-209,111
Acquisition of additional 33.3% membership interest in Pony Express	-700,000	0
Other investing, net	-311	-1,910
Net Cash Used in Investing Activities	713,611	211,021
Net Cash Provided by Financing Activities
Proceeds from public offerings, net of offering costs	551,949	0
Borrowings under revolving credit facility, net	139,000	0
Contributions from Predecessor Member, net	0	195,299
Distributions to unitholders	-28,294	-13,082
Other financing, net	2,326	1,201
Net Cash Provided by Financing Activities	664,981	183,418
Net Change in Cash and Cash Equivalents
Net Change in Cash and Cash Equivalents	9	0
Cash and Cash Equivalents, beginning of period	867	0
Cash and Cash Equivalents, end of period	876	0
Supplemental Disclosures:
Property, plant and equipment acquired via the cash management agreement with TD	72,407	0
Increase in accrual for payment of property, plant and equipment	$1,179	$53,542

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	$1,273,302	$1,060,550	$1,038,723	$991,162
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	1,644,952	1,510,111	1,795,151	1,309,101
Net income (loss)	32,319	17,124
Issuance of units to public, net of offering costs	551,949
Distributions to unitholders	28,294	13,082
Noncash compensation expense	2,933	2,176
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		63,170
TEP Predecessor Post-IPO [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	0	314,615	0	247,221
Net income (loss)	0	4,224
Issuance of units to public, net of offering costs	0
Distributions to unitholders	0	0
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		63,170
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	-357,145	14,135	-35,743	14,078
Net income (loss)	7,438	382
Issuance of units to public, net of offering costs	0
Distributions to unitholders	4,512	-325
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	0
Contributions from Predecessor Member, net		0
Common unitholders | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	1,630,447	457,230	800,333	455,197
Net income (loss)	19,701	7,511
Issuance of units to public, net of offering costs	-551,949
Distributions to unitholders	15,925	-7,654
Noncash compensation expense	-2,933	2,176
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	271,456
Contributions from Predecessor Member, net		0
Subordinated Units [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	0	274,570	274,133	274,666
Net income (loss)	5,180	5,007
Issuance of units to public, net of offering costs	0
Distributions to unitholders	7,857	-5,103
Noncash compensation expense	0	0
Contributions from noncontrolling interest	0
Distributions to noncontrolling interest	0
Conversion of subordinated units	-271,456
Contributions from Predecessor Member, net		0
Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners' Capital	371,650	449,561	756,428	317,939
Net income (loss)	-9,329	-507
Issuance of units to public, net of offering costs	0
Distributions to unitholders	0	0
Noncash compensation expense	0	0
Contributions from noncontrolling interest	2,379
Distributions to noncontrolling interest	-2,156
Conversion of subordinated units	0
Contributions from Predecessor Member, net		132,129
Total Partner Equity Including Portion Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	22,990	16,617
Issuance of units to public, net of offering costs	551,949
Distributions to unitholders	28,294	13,082
Noncash compensation expense	2,933	2,176
Contributions from noncontrolling interest	2,379
Distributions to noncontrolling interest	-2,156
Conversion of subordinated units	0
Contributions from Predecessor Member, net		195,299
Pony Express Pipeline
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)		-253
Acquisition of additional 33.3% membership interest in Pony Express	-324,328
Pony Express Pipeline | TEP Predecessor Post-IPO [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	-324,328
Pony Express Pipeline | Common unitholders | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | Subordinated Units [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	0
Pony Express Pipeline | Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	-375,672
Pony Express Pipeline | Total Partner Equity Including Portion Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Acquisition of additional 33.3% membership interest in Pony Express	($700,000)

Description_of_Business

Description of Business	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Tallgrass Energy Partners, LP ("TEP" or the "Partnership") is a Delaware limited partnership formed in February 2013 to own, operate, acquire and develop midstream energy assets in North America. TEP currently provides natural gas transportation and storage services for customers in the Rocky Mountain and Midwest regions of the United States through the Tallgrass Interstate Gas Transmission System, which we refer to as the TIGT System, and the Trailblazer Pipeline. TEP provides crude oil transportation to customers in Wyoming and the surrounding region, servicing the Bakken oil production area of North Dakota and eastern Montana through our membership interest in Tallgrass Pony Express Pipeline, LLC ("Pony Express"), which owns a crude oil pipeline system commencing in Guernsey, Wyoming and terminating in Cushing, Oklahoma. We refer to this crude oil pipeline system as the Pony Express System. TEP also provides services for customers in Wyoming at its Casper and Douglas natural gas processing facilities, or collectively the Midstream Facilities, and provides water business services to customers in Colorado and Texas through BNN Water Solutions, LLC ("Water Solutions"). TEP's operations are strategically located in and provide services to certain key United States hydrocarbon basins, including the Denver-Julesburg, Powder River, Wind River, Permian and Hugoton-Anadarko Basins and the Niobrara, Mississippi Lime, Eagle Ford and Bakken shale formations.
	The 33,878,625 common units held by the public constitute approximately 56.2% of TEP’s aggregate outstanding common units and approximately 55.5% of TEP’s aggregate outstanding common and general partner units at March 31, 2015. Tallgrass Development, LP ("TD") held 26,355,480 common units at March 31, 2015, including the 16,200,000 subordinated units converted to common units on February 17, 2015, as discussed further in Note 10 - Partnership Equity and Distributions, which comprised approximately 43.8% of TEP’s aggregate outstanding common units and approximately 43.2% of TEP’s aggregate outstanding common and general partner units. In addition, 834,391 general partner units, representing an approximate 1.4% general partner interest in TEP at March 31, 2015, and all of the incentive distribution rights ("IDRs") are held by Tallgrass MLP GP, LLC (the "general partner"). The partnership agreement requires TEP to distribute its available cash on a quarterly basis, subject to certain terms and conditions. For additional information, see Note 10 - Partnership Equity and Distributions.
	The term "Trailblazer Predecessor" refers to Trailblazer Pipeline Company LLC ("Trailblazer") for the period from November 13, 2012 to its acquisition by TEP on April 1, 2014, and the term "Pony Express Predecessor" refers to Pony Express for the period from November 13, 2012 to September 1, 2014, the date on which TEP acquired a controlling 33.3% membership interest. Trailblazer Predecessor and Pony Express Predecessor are collectively referred to as the Predecessor Entities, as further discussed in Note 2 – Summary of Significant Accounting Policies. Financial results for all prior periods have been recast to reflect the operations of the Predecessor Entities. Predecessor Equity as presented in the condensed consolidated financial statements represents the capital account activity of Trailblazer Predecessor prior to April 1, 2014 and of Pony Express Predecessor prior to September 1, 2014. For additional information regarding these acquisitions, see Note 4 – Acquisitions.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation
	These unaudited condensed consolidated financial statements and related notes for the three months ended March 31, 2015 and 2014 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board’s Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include disclosures required by GAAP for annual periods. The unaudited condensed consolidated financial statements for the three months ended ended March 31, 2015 and 2014 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair presentation of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation.
	TEP’s financial results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2015. These unaudited condensed consolidated financial statements should be read in conjunction with TEP’s audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”) filed with the United States Securities and Exchange Commission (the “SEC”) on February 19, 2015.
	The accompanying condensed consolidated financial statements of TEP include historical cost-basis accounts of the assets of Trailblazer for the periods prior to April 1, 2014, the date TEP acquired Trailblazer from TD, and Pony Express for the periods prior to September 1, 2014, the date TEP acquired a controlling 33.3% membership interest in Pony Express, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis.
	As further discussed in Note 4 – Acquisitions, TEP closed the acquisition of Trailblazer on April 1, 2014 and the acquisition of a 33.3% membership interest in Pony Express effective September 1, 2014. As the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are considered transactions between entities under common control, and a change in reporting entity, the financial information presented for prior periods has been recast to include Trailblazer and the initial 33.3% membership interest in Pony Express for all periods presented. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to March 1, 2015 have not been recast to reflect the additional 33.3% membership interest.
	The condensed consolidated financial statements include the accounts of TEP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net equity contributions of the Predecessor Entities included in the condensed consolidated statements of cash flows represent transfers of cash as a result of TD’s centralized cash management systems prior to April 1, 2014 for Trailblazer and September 1, 2014 for Pony Express, under which cash balances were swept daily and recorded as loans from the subsidiaries to TD. These loans were then periodically recorded as equity distributions. Pony Express participates in a cash management agreement with TD, which holds a 33.3% common membership interest in Pony Express, under which cash balances are swept daily and recorded as loans from Pony Express to TD.
	Net income or loss from consolidated subsidiaries that are not wholly-owned by TEP is attributed to TEP and noncontrolling interests. This is done in accordance with substantive profit sharing arrangements, which generally follow the allocation of cash distributions and may not follow the respective ownership percentages held by TEP. Concurrent with TEP's acquisition of an initial 33.3% membership interest in Pony Express effective September 1, 2014, TEP, TD, and Pony Express entered into the Second Amended and Restated Limited Liability Agreement of Tallgrass Pony Express Pipeline, LLC ("the Second Amended Pony Express LLC Agreement"), which provided TEP a minimum quarterly preference payment of $16.65 million (prorated to approximately $5.4 million for the quarter ended September 30, 2014) through the quarter ending September 30, 2015. Effective March 1, 2015 with TEP's acquisition of an additional 33.3% membership interest in Pony Express, the Second Amended Pony Express LLC Agreement was further amended (as amended, "the Pony Express LLC Agreement") to increase the minimum quarterly preference payment to $36.65 million (prorated to approximately $23.5 million for the quarter ended March 31, 2015) and extend the term of the preference period through the quarter ending December 31, 2015. The Pony Express LLC Agreement provides that the net income or loss of Pony Express be allocated, to the extent possible, consistent with the allocation of Pony Express cash distributions. Under the terms of the Pony Express LLC Agreement, Pony Express distributions and net income for periods beginning after December 31, 2015 will be attributed to TEP and noncontrolling interests in accordance with the respective ownership interests.
	A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity’s economic performance. TEP has presented separately in its condensed consolidated balance sheets, to the extent material, the assets of its consolidated VIE that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of TEP's consolidated VIE for which creditors do not have recourse to TEP's general credit. Pony Express is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, TEP has determined that it is the primary beneficiary as it has the power to direct matters that most significantly impact the activities of Pony Express and has the right to receive benefits of Pony Express that could potentially be significant to Pony Express. TEP has consolidated Pony Express accordingly. For additional information see Note 3 – Variable Interest Entities.
	Use of Estimates
	Certain amounts included in or affecting these consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on TEP’s business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.
	Accounting Pronouncements Issued But Not Yet Effective
	Accounting Standards Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)"
	In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract.
	The amendments in ASU 2014-09 are effective for public entities for annual reporting periods beginning after December 15, 2016, and for interim periods within that reporting period. Early application is not permitted. TEP is currently evaluating the impact of ASU 2014-09.
	ASU No. 2014-12, "Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period"
	In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides explicit guidance on accounting for share-based payments requiring a specific performance target to be achieved in order for employees to become eligible to vest in the awards when that performance target may be achieved after the requisite service period for the award. The ASU requires that such performance targets be treated as a performance condition, and should not be reflected in the estimate of the grant-date fair value of the award. Instead, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved.
	ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of ASU 2014-12 is not expected to have a material impact on TEP's financial position and results of operations.
	ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis"
	In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 will change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 will modify the evaluation of whether limited partnerships and other similar legal entities are considered VIEs or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, and change certain aspects of the consolidation analysis for reporting entities that are involved with VIEs, particularly for those with fee arrangements and related party relationships.
	The amendments in ASU 2015-02 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early application is permitted, including adoption in an interim period. TEP is currently evaluating the impact of ASU 2015-02.

Variable_Interest_Entity_Notes

Variable Interest Entity (Notes)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity Disclosure [Text Block]	TEP does not have the obligation to absorb losses from Pony Express during the preference period as a result of the minimum quarterly preference payments as discussed in Note 4 – Acquisitions. In addition, for the period from the acquisition of the initial 33.3% membership interest effective September 1, 2014 to the acquisition of an additional 33.3% membership interest effective March 1, 2015, TEP, as the managing member of Pony Express, had voting rights disproportionate to its ownership interest. As a result, TEP has determined that Pony Express is a VIE of which TEP is the primary beneficiary and consolidates Pony Express accordingly.
	TEP has not provided any additional financial support to Pony Express other than its initial capital contribution of $570 million and has no contractual commitments or obligations to provide additional financial support. In the event that the costs of construction of the Pony Express System and lateral in Northeast Colorado exceed the $270 million retained by Pony Express as discussed in Note 4 – Acquisitions, TD is obligated to fund the remaining costs.
	The carrying amounts and classifications of the Pony Express assets and liabilities included in TEP's condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Current assets	$	27,315	$	93,019
	Noncurrent assets	1,362,803		1,300,816
	Total assets	$	1,390,118	$	1,393,835
	Current liabilities	$	57,336	$	52,547
	Total liabilities	$	57,336	$	52,547

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	TEP Acquisition of Trailblazer
	On April 1, 2014, TEP closed the acquisition of Trailblazer from a wholly owned subsidiary of TD for total consideration valued at approximately $164 million, consisting of $150 million in cash and the issuance of 385,140 common units (valued at approximately $14 million based on the March 31, 2014 closing price of TEP’s common units). On that same date, the general partner contributed additional capital in the amount of approximately $263,000 in exchange for the issuance of 7,860 general partner units in order to maintain its 2% general partner interest. The acquisition of Trailblazer represents a change in reporting entity and a transaction between entities under common control. The excess purchase price over the net book value of Trailblazer's assets and liabilities was accounted for as a deemed distribution as discussed further in Note 10 – Partnership Equity and Distributions.
	TEP Acquisitions of 66.7% of Pony Express
	Effective September 1, 2014, TEP acquired a controlling 33.3% membership interest in Pony Express for total consideration of approximately $600 million. At closing, Pony Express, TD, and TEP entered into a Second Amended and Restated Limited Liability Company Agreement of Pony Express effective September 1, 2014, which sets forth the relative rights of TD and TEP as the owners of Pony Express. Of the total consideration of $600 million, TEP directly paid TD $30 million, consisting of $27 million in cash and 70,340 TEP common units with an aggregate fair value of approximately $3 million, in exchange for the transfer by TD to TEP of a 1.9585% membership interest in Pony Express (computed before giving effect to the issuance of the new membership interest by Pony Express to TEP). TEP also contributed cash of $570 million to Pony Express in exchange for a newly issued membership interest which, when combined with the membership interest transferred from TD and the parties' entry at closing into the Second Amended and Restated Limited Liability Company Agreement of Pony Express, constituted TEP's 33.3% membership interest in Pony Express, which represented 100% of the preferred membership units issued by Pony Express. Of the $570 million cash consideration received by Pony Express, $300 million was immediately distributed to TD at closing and $270 million was retained by Pony Express to fund the estimated remaining costs of construction for the Pony Express System and the lateral in Northeast Colorado. The $270 million cash balance was subsequently swept to TD under a cash management agreement between Pony Express and TD and was recorded as a related party loan which bears interest at TD's incremental borrowing rate. There was no remaining balance outstanding on the related party loan at March 31, 2015.
	The terms of TEP's first acquisition of a 33.3% membership interest in Pony Express provided TEP a minimum quarterly preference payment of $16.65 million through the quarter ending September 30, 2015 (prorated to approximately $5.4 million for the quarter ended September 30, 2014) with distributions thereafter shared in accordance with the terms of the Second Amended Pony Express LLC Agreement. At the effective date of that transaction, TEP determined that Pony Express was a VIE of which TEP was the primary beneficiary, and consolidated Pony Express accordingly. For additional discussion and disclosure, see Note 3 – Variable Interest Entities. The acquisition of the initial 33.3% membership interest in Pony Express represented a transaction between entities under common control and a change in reporting entity.
	Effective March 1, 2015, TEP acquired an additional 33.3% membership interest in Pony Express for cash consideration of approximately $700 million. At closing, Pony Express, TD, and TEP entered into the Pony Express LLC Agreement effective March 1, 2015, which sets forth the relative rights of TD and TEP as the owners of Pony Express. The terms of the transaction increased the minimum quarterly preference payment provided to TEP to $36.65 million through the quarter ending December 31, 2015 (prorated to approximately $23.5 million for the quarter ended March 31, 2015) with distributions thereafter shared in accordance with the terms of the Pony Express LLC Agreement.
	Upon the effective date of the transaction, TEP reevaluated its VIE assessment and determined that Pony Express continues to be considered a VIE of which TEP is the primary beneficiary. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to the transaction have not been recast to reflect the additional 33.3% membership interest.
	Historical Financial Information
	The results of our acquisitions of Trailblazer and 66.7% membership interest in Pony Express are included in the condensed consolidated balance sheet as of March 31, 2015. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated balance sheet as of December 31, 2014. The results of our acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income for the three months ended March 31, 2015 and 2014. The results of our acquisition of an additional 33.3% membership interest in Pony Express are included in the condensed consolidated statements of income prospectively beginning March 1, 2015.
	The following tables present the previously reported condensed consolidated statements of income for the three months ended March 31, 2014, adjusted for the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express:
			Three Months Ended March 31, 2014
			TEP			Consolidate Trailblazer Pipeline Company LLC		Consolidate Tallgrass Pony Express Pipeline, LLC			TEP (As currently reported)
			(in thousands)
	Revenues:
	Natural gas liquids sales		$	48,907		$	—	$	—		$	48,907
	Natural gas sales		2,196			2,612		—			4,808
	Transportation services		27,051			7,053		—			34,104
	Processing and other revenues		6,808			152		—			6,960
	Total Revenues		84,962			9,817		—			94,779
	Operating Costs and Expenses:
	Cost of sales		45,543			2,663		—			48,206
	Cost of transportation services		4,903			214		—			5,117
	Operations and maintenance		7,286			727		—			8,013
	Depreciation and amortization		6,514			1,038		757			8,309
	General and administrative		6,201			448		—			6,649
	Taxes, other than income taxes		1,456			500		—			1,956
	Total Operating Costs and Expenses		71,903			5,590		757			78,250
	Operating Income (Loss)		13,059			4,227		(757		)	16,529
	Other (Expense) Income:
	Interest (expense) income, net		(1,324		)	31		(3		)	(1,296		)
	Equity in earnings of unconsolidated investment		444			—		—			444
	Other income, net		721			219		—			940
	Total Other (Expense) Income		(159		)	250		(3		)	88
	Net Income (Loss)		12,900			4,477		(760		)	16,617
	Net loss attributable to noncontrolling interests		—			—		507			507
	Net income (loss) attributable to partners		$	12,900		$	4,477	$	(253	)	$	17,124
	Formation of BNN Water Solutions, LLC
	On November 26, 2013, TEP, through its wholly-owned subsidiary Tallgrass Energy Investments, LLC ("TEI"), entered into a joint venture agreement with BNN Energy LLC ("BNN") to form Grasslands Water Services I, LLC ("GWSI"). GWSI subsequently built and began operating an intrastate water pipeline in Colorado. TEP accounted for its 50% equity interest in GWSI as an equity method investment. On May 13, 2014, TEI entered into a contribution agreement with BNN and several other parties to form a new entity known as BNN Water Solutions, LLC ("Water Solutions"). Under the terms of the contribution agreement, TEI agreed to contribute its existing 50% interest in GWSI, along with $7.6 million cash, in exchange for an 80% membership interest in Water Solutions. As part of the transaction, GWSI was renamed BNN Redtail, LLC ("Redtail"), became a subsidiary of Water Solutions, and issued preferred equity interests to TEI. Among the assets contributed by BNN and the other parties to the transaction were the other 50% interest in Redtail and a 100% equity interest in Alpha Reclaim Technology, LLC ("Alpha"), a company which sources treated wastewater from municipalities in Texas. Alpha is wholly-owned by Redtail.
	Upon closing of the transaction, TEP obtained a controlling financial interest in Water Solutions and accordingly has accounted for the transaction as a step acquisition under ASC 805. On the acquisition date, TEP remeasured its previously held 50% equity interest in Redtail to its fair value of $11.9 million, recognized a gain of $9.4 million, and consolidated Water Solutions. The 20% equity interest in Water Solutions held by noncontrolling interests was recorded at its acquisition date fair value of $1.4 million. The fair values of the previously held equity interest and the noncontrolling interest were determined using a discounted cash flow analysis. These fair value measurements are based on significant inputs that are not observable in the market and thus represent fair value measurements categorized within Level 3 of the fair value hierarchy under ASC 820.
	At March 31, 2015, the assets acquired and liabilities assumed in the acquisition were recorded at provisional amounts based on the preliminary purchase price allocation. TEP is in the process of obtaining additional information to identify and measure all assets acquired and liabilities assumed in the acquisition within the measurement period. Such provisional amounts will be adjusted if necessary to reflect any new information about facts and circumstances that existed at the acquisition date that, if known, would have affected the measurement of these amounts.
	Pro forma revenue and net income attributable to TEP for the three months ended March 31, 2014 was $96.7 million and $17.4 million, respectively. This unaudited pro forma financial information for TEP is presented as if the acquisition of Water Solutions had been completed on January 1, 2014. The pro forma financial information is not necessarily indicative of what the actual results of operations or financial position of TEP would have been if the transactions had in fact occurred on the date or for the period indicated, nor do they purport to project the results of operations or financial position of TEP for any future periods or as of any date. The pro forma financial information does not give effect to any cost savings, operating synergies, or revenue enhancements expected to result from the transactions or the costs to achieve these cost savings, operating synergies, and revenue enhancements. The pro forma revenue and net income includes adjustments for the three months ended March 31, 2014 to give effect to the following:
	(a)	Reduction in net income attributable to TEP to remove equity in earnings of GWSI recorded for the period from January 1, 2014 to March 31, 2014.
	(b)	Increase in revenue and net income attributable to TEP to reflect TEP's consolidated 80% interest in the operations of GWSI for the period from January 1, 2014 to March 31, 2014.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	TEP has no employees. TD, through its wholly-owned subsidiary Tallgrass Operations, LLC ("Tallgrass Operations"), provided and charged TEP for direct and indirect costs of services  provided to us or incurred on our behalf including employee labor costs, information technology services, employee health and retirement benefits, and all other expenses necessary or appropriate to the conduct of our business. TEP recorded these costs on the accrual basis in the period in which TD incurred them. On May 17, 2013, in connection with the closing of TEP’s initial public offering, TEP and its general partner entered into an Omnibus Agreement with TD and certain of its affiliates, including Tallgrass Operations (the "Omnibus Agreement"). The Omnibus Agreement provides that, among other things, TEP will reimburse TD and its affiliates for all expenses they incur and payments they make on TEP’s behalf, including the costs of employee and director compensation and benefits as well as the cost of the provision of certain centralized corporate functions performed by TD, including legal, accounting, cash management, insurance administration and claims processing, risk management, health, safety and environmental, information technology and human resources in each case to the extent reasonably allocable to TEP.
	For the first quarter of 2015, TEP’s general and administrative costs under the Omnibus Agreement were $5.4 million, excluding costs attributable to Pony Express. Pony Express had general and administrative costs for the first quarter of 2015 of $5.2 million. TEP also pays a quarterly reimbursement to TD for costs associated with being a public company. The quarterly public company reimbursement was $635,000 for the first quarter of 2015. These amounts will be periodically reviewed and adjusted as necessary to continue to reflect reasonable allocation of costs to TEP.
	Due to the cash management agreement discussed in Note 2 – Summary of Significant Accounting Policies, intercompany balances at the Predecessor Entities were periodically settled and treated as equity distributions prior to April 1, 2014 for Trailblazer and prior to September 1, 2014 for Pony Express. Balances lent to TD under the Pony Express cash management agreement effective September 1, 2014 are classified as related party receivables in the condensed consolidated balance sheets. TEP recognized interest income from TD of $0.4 million during the three months ended March 31, 2015 on the receivable balance under the Pony Express cash management agreement.
	Totals of transactions with affiliated companies are as follows:
		Three Months Ended March 31,
		2015		2014
		(in thousands)
	Charges to TEP: (1)
	Property, plant and equipment, net	$	1,307	$	3,400
	Operation and maintenance	$	5,423	$	4,348
	General and administrative	$	9,256	$	4,927
	(1)	Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.
	Details of balances with affiliates included in "Receivable from related party" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Receivable from related party:
	Tallgrass Operations, LLC	$	—	$	73,393
	Total receivable from related party	$	—	$	73,393
	Accounts payable to related parties:
	Tallgrass Operations, LLC	$	2,980	$	3,894
	Rockies Express Pipeline LLC	11		21
	Deeprock Development, LLC	9		—
	Total accounts payable to related parties	$	3,000	$	3,915
	Balances of gas imbalances with affiliated shippers are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Affiliate gas balance receivables	$	168	$	275
	Affiliate gas balance payables	$	410	$	455

Inventory

Inventory	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory	The components of inventory at March 31, 2015 and December 31, 2014 consisted of the following:
		31-Mar-15		31-Dec-14
		(in thousands)
	Gas in underground storage	$	6,055	$	8,896
	Materials and supplies	4,600		3,049
	Crude oil	1,592		581
	Natural gas liquids	432		519
	Total inventory	$	12,679	$	13,045

Property_Plant_and_Equipment

Property, Plant and Equipment	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	A summary of net property, plant and equipment by classification is as follows:
		31-Mar-15			31-Dec-14
		(in thousands)
	Crude oil pipelines	$	961,288		$	939,536
	Natural gas pipelines	553,425			548,482
	Processing and treating assets	237,049			241,671
	General and other	52,666			42,719
	Construction work in progress	194,638			139,873
	Accumulated depreciation and amortization	(77,390		)	(59,200		)
	Total property, plant and equipment, net	$	1,921,676		$	1,853,081

Risk_Management

Risk Management

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Risk Management

TEP occasionally enters into derivative contracts with third parties for the purpose of hedging exposures that accompany their normal business activities. TEP’s normal business activities directly and indirectly expose them to risks associated with changes in the market price of crude oil and natural gas, among other commodities. Specifically, the risks associated with changes in the market price of natural gas include, among others (i) pre-existing or anticipated physical natural gas sales, (ii) natural gas purchases and (iii) natural gas system use and storage. TEP has elected not to apply hedge accounting and changes in the fair value of all derivative contracts are recorded in earnings in the period in which the change occurs.

Fair Value of Derivative Contracts

The following table summarizes the fair values of TEP’s derivative contracts included in the condensed consolidated balance sheets:

Balance Sheet

31-Mar-15

31-Dec-14

Location

(in thousands)

Energy commodity derivative contracts

Current assets

$

90

$

—

As of March 31, 2015, the fair value shown for commodity contracts was comprised of derivative volumes for short natural gas fixed-price swaps totaling 0.9 Bcf. As of December 31, 2014 there were no derivative contracts outstanding.

Effect of Derivative Contracts in the Statements of Income

The following table summarizes the impact of derivative contracts for the three months ended March 31, 2015 and 2014:

Amount of gain (loss) recognized in income on derivatives

Location of

Three Months Ended March 31,

gain (loss) recognized

in income on derivatives

2015

2014

(in thousands)

Derivatives not designated as hedging contracts:

Energy commodity derivative contracts

Natural gas sales

$

90

$

(351

)

Credit Risk

TEP has counterparty credit risk as a result of its use of derivative contracts. TEP’s counterparties consist of major financial institutions. This concentration of counterparties may impact TEP’s overall exposure to credit risk, either positively or negatively, in that the counterparties may be similarly affected by changes in economic, regulatory or other conditions.

TEP maintains credit policies that it believes minimize its overall credit risk. These policies include (i) evaluation of potential counterparties’ financial condition (including credit ratings), (ii) collateral requirements under certain circumstances and (iii) the use of standardized agreements which allow for netting of positive and negative exposure associated with a single counterparty. Based on its policies and exposure, TEP’s management does not currently anticipate a material adverse effect on TEP’s financial position, results of operations, or cash flows as a result of counterparty performance.

TEP’s over-the-counter swaps are entered into with counterparties outside central trading organizations such as a futures, options or stock exchange. These contracts are with financial institutions with investment grade credit ratings. While TEP enters into derivative transactions principally with investment grade counterparties and actively monitors their credit ratings, it is nevertheless possible that from time to time losses will result from counterparty credit risk in the future. The maximum potential exposure to credit losses on TEP’s derivative contracts at March 31, 2015 was:

Asset Position

(in thousands)

Gross

$

90

Netting agreement impact

—

Cash collateral held

—

Net Exposure

$

90

In addition, when the market value of TEP’s derivative contracts with specific counterparties exceeds established limits, TEP is required to provide collateral to its counterparties, which may include posting letters of credit or placing cash in margin accounts. Accordingly, entity valuation adjustments are necessary to reflect the effect of TEP’s own credit quality on the fair value of TEP’s net liability position with each counterparty. The methodology to determine this adjustment is consistent with how TEP evaluates counterparty credit risk, taking into account current credit spreads for its comparative industry sector, as well as any change in such spreads since the last measurement date. As of March 31, 2015 and December 31, 2014, TEP did not have any outstanding letters of credit or cash in margin accounts in support of its hedging of commodity price risks associated with the sale of natural gas nor did TEP have margin deposits with counterparties associated with energy commodity contract positions.

Fair Value

Derivative assets and liabilities are measured and reported at fair value. Derivative contracts can be exchange-traded or over-the-counter ("OTC"). Exchange-traded derivative contracts typically fall within Level 1 of the fair value hierarchy if they are traded in an active market. TEP values exchange-traded derivative contracts using quoted market prices for identical securities.

OTC derivatives are valued using models utilizing a variety of inputs including contractual terms and commodity and interest rate curves. The selection of a particular model and particular inputs to value an OTC derivative contract depends upon the contractual terms of the instrument as well as the availability of pricing information in the market. TEP uses similar models to value similar instruments. For OTC derivative contracts that trade in liquid markets, such as generic forwards and swaps, model inputs can generally be verified and model selection does not involve significant management judgment. Such contracts are typically classified within Level 2 of the fair value hierarchy.

Certain OTC derivative contracts trade in less liquid markets with limited pricing information; as such, the determination of fair value for these derivative contracts is inherently more difficult. Such contracts are classified within Level 3 of the fair value hierarchy. The valuations of these less liquid OTC derivatives are typically impacted by Level 1 and/or Level 2 inputs that can be observed in the market, as well as unobservable Level 3 inputs. Use of a different valuation model or different valuation input values could produce a significantly different estimate of fair value. However, derivative contracts valued using inputs unobservable in active markets are generally not material to TEP’s financial statements.

When appropriate, valuations are adjusted for various factors including credit considerations. Such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate is used.

The following table summarizes the fair value measurements of TEP’s energy commodity derivative contracts as of March 31, 2015 based on the fair value hierarchy established by the Codification:

Asset fair value measurements using

Total

Quoted prices in

Significant

Significant

active markets

other observable

unobservable

for identical

inputs

inputs

assets

(Level 2)

(Level 3)

(Level 1)

(in thousands)

TEP as of March 31, 2015

Energy commodity derivative contracts

$

90

$

—

$

90

$

—

Longterm_Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-term Debt	The following table sets forth the outstanding borrowings, letters of credit issued, and available borrowing capacity under TEP's revolving credit facility as of March 31, 2015 and December 31, 2014:
		31-Mar-15			31-Dec-14
		(in thousands)
	Total capacity under the revolving credit facility	$	850,000		$	850,000
	Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
	Available capacity under the revolving credit facility	$	152,000		$	291,000
	The revolving credit facility contains various covenants and restrictive provisions that, among other things, limit or restrict TEP’s ability (as well as the ability of TEP’s restricted subsidiaries) to incur or guarantee additional debt, incur certain liens on assets, dispose of assets, make certain distributions (including distributions from available cash, if a default or event of default under the credit agreement then exists or would result from making such a distribution), change the nature of TEP’s business, engage in certain mergers or make certain investments and acquisitions, enter into non-arms-length transactions with affiliates and designate certain subsidiaries as "Unrestricted Subsidiaries." In addition, TEP is required to maintain a consolidated leverage ratio of not more than 4.75 to 1.00 (which will be increased to 5.25 to 1.00 for certain measurement periods following the consummation of certain acquisitions) and a consolidated interest coverage ratio of not less than 2.50 to 1.00. As of March 31, 2015, TEP is in compliance with the covenants required under the revolving credit facility.
	The unused portion of the revolving credit facility is subject to a commitment fee, which ranges from 0.300% to 0.500%, based on TEP’s total leverage ratio. As of March 31, 2015, the weighted average interest rate on outstanding borrowings was 2.20%.
	Fair Value
	The following table sets forth the carrying amount and fair value of TEP’s long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, but for which fair value is disclosed:
		Fair Value
		Quoted prices			Significant			Significant		Total		Carrying
		in active markets			other observable			unobservable				Amount
		for identical assets			inputs			inputs
		(Level 1)			(Level 2)			(Level 3)
		(in thousands)
	March 31, 2015	$	—		$	698,000		$	—	$	698,000	$	698,000
	December 31, 2014	$	—		$	559,000		$	—	$	559,000	$	559,000
	The long-term debt borrowed under the revolving credit facility is carried at amortized cost. As of March 31, 2015 and December 31, 2014, the fair value approximates the carrying amount for the borrowings under the revolving credit facility using a discounted cash flow analysis. TEP is not aware of any factors that would significantly affect the estimated fair value subsequent to March 31, 2015.

Partnership_Equity_and_Distrib

Partnership Equity and Distributions

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Partnership Equity and Distributions

February Public Offering

On February 27, 2015, TEP sold 10,000,000 common units representing limited partner interests in an underwritten public offering at a price of $50.82 per unit, or $49.29 per unit net of the underwriter's discount, for net proceeds of approximately $492.6 million after deducting the underwriter's discount and offering expenses paid by TEP. TEP used the net proceeds from the offering to fund a portion of the consideration for the acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions. Pursuant to the underwriters' option to purchase additional units, TEP sold an additional 1,200,000 common units representing limited partner interests to the underwriters at a price of $50.82 per unit, or $49.29 per unit net of the underwriter’s discount, for net proceeds of approximately $59.3 million after deducting the underwriter’s discount and offering expenses paid by TEP. TEP used the net proceeds from this additional purchase of common units to reduce borrowings under its revolving credit facility, a portion of which were used to fund the March 2015 acquisition of an additional 33.3% membership interest in Pony Express as discussed in Note 4 – Acquisitions.

Distributions to Holders of Common Units, Subordinated Units, General Partner Units and Incentive Distribution Rights

TEP’s partnership agreement requires TEP to distribute its available cash, as defined below, to unitholders of record on the applicable record date within 45 days after the end of each quarter, beginning with the quarter ended June 30, 2013. TEP’s partnership agreement provides that available cash, each quarter, is first distributed to the common unitholders and the general partner on a pro rata basis until each common unitholder has received $0.2875 per unit, which amount is defined in TEP’s partnership agreement as the minimum quarterly distribution ("MQD").

The following table shows the distributions for the periods indicated:

Distributions

Limited Partners

General Partner

Distributions

Common and

per Limited

Three Months Ended

Date Paid

Subordinated Units

Incentive Distribution Rights

General Partner Units

Total

Partner Unit

(in thousands, except per unit amounts)

31-Mar-15

May 14, 2015 (1)

$

31,322

$

6,934

$

530

$

38,786

$

0.52

31-Dec-14

February 13, 2015

23,782

4,039

473

28,294

0.485

30-Sep-14

November 14, 2014

20,092

1,208

363

21,663

0.41

30-Jun-14

August 14, 2014

18,596

758

330

19,684

0.38

March 31, 2014

May 14, 2014

13,288

126

274

13,688

0.325

(1)

The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

Subordinated Units

Under the terms of TEP's partnership agreement and upon the payment of the quarterly cash distribution to unitholders on February 13, 2015, the subordination period ended. As a result, the 16,200,000 subordinated units held by TD converted into common units on a one for one basis on February 17, 2015. The conversion of the subordinated units did not impact the aggregate amount of cash distributions paid.

General Partner Units

As of March 31, 2015, the general partner owns an approximate 1.4% general partner interest in TEP, represented by 834,391 general partner units. Under TEP’s partnership agreement, the general partner may at any time (but is under no obligation to) contribute additional capital to TEP in order to maintain or attain a 2% general partner interest.

Incentive Distribution Rights

The general partner also owns all of the IDRs. IDRs represent the right to receive an increasing percentage (13%, 23% and 48%) of quarterly distributions of available cash from operating surplus after the MQD and the target distribution levels have been achieved. The general partner may transfer these rights separately from its general partner interest, subject to restrictions in TEP’s partnership agreement.

The following discussion related to incentive distributions assumes that TEP’s general partner holds a 2% general partner interest and continues to own all of the IDRs.

If for any quarter:

•

TEP has distributed available cash from operating surplus to all of the common unitholders (and during the subordination period, to the subordinated unitholders) in an amount equal to the MQD for each outstanding unit for such quarter; and

•

TEP has distributed available cash from operating surplus on outstanding common units in an amount necessary to eliminate any cumulative arrearages in the payment of the MQD to common unitholders;

then, TEP will distribute additional available cash from operating surplus for that quarter among the unitholders and the general partner in the following manner:

•

first, 98% to all unitholders, pro rata, and 2% to TEP’s general partner, until each unitholder receives a total of $0.3048 per unit for that quarter (the "first target distribution");

•

second, 85% to all unitholders, pro rata, and 15% to TEP’s general partner, until each unitholder receives a total of $0.3536 per unit for that quarter (the "second target distribution");

•

third, 75% to all unitholders, pro rata, and 25% to TEP’s general partner, until each unitholder receives a total of $0.4313 per unit for that quarter (the "third target distribution"); and

•

thereafter, 50% to all unitholders, pro rata, and 50% to TEP’s general partner.

Definition of Available Cash

Available cash generally means, for any quarter, all cash and cash equivalents on hand at the end of that quarter:

•

less, the amount of cash reserves established by TEP’s general partner to:

▪

provide for the proper conduct of TEP’s business (including reserves for future capital expenditures, for anticipated future credit needs subsequent to that quarter, for legal matters and for refunds of collected rates reasonably likely to be refunded as a result of a settlement or hearing related to FERC rate proceedings);

▪

comply with applicable law or regulation, or any of TEP’s debt instruments or other agreements; or

▪

provide funds for distributions to unitholders and to TEP’s general partner for any one or more of the next four quarters (provided that TEP’s general partner may not establish cash reserves for distributions if the effect of the establishment of such reserves will prevent TEP from distributing the MQD on all common units and any cumulative arrearages on such common units for the current quarter);

•

plus, if TEP’s general partner so determines, all or any portion of the cash on hand on the date of distribution of available cash for the quarter, including cash on hand resulting from working capital borrowings made subsequent to the end of such quarter.

Other Contributions and Distributions

During the three months ended March 31, 2015, TEP was deemed to have made a noncash capital distribution of $324.3 million to the general partner, which represents the excess purchase price over the carrying value of the additional 33.3% membership interest in Pony Express acquired effective March 1, 2015. See Note 4 - Acquisitions for additional information regarding the transaction.

During the three months ended March 31, 2014, the Trailblazer Predecessor and Pony Express Predecessor recognized net contributions from TD of $195.3 million.

Net_Income_per_Limited_Partner

Net Income per Limited Partner Unit	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income per Limited Partner Unit	The Partnership’s net income is allocated to the general partner and the limited partners, including the holders of the subordinated units, in accordance with their respective ownership percentages, after giving effect to incentive distributions paid to the general partner. Basic and diluted net income per limited partner unit is calculated by dividing limited partners’ interest in net income, less general partner incentive distributions, by the weighted average number of outstanding limited partner units during the period.
	TEP computes earnings per unit using the two-class method for Master Limited Partnerships as prescribed in the FASB guidance. The two-class method requires that securities that meet the definition of a participating security be considered for inclusion in the computation of basic earnings per unit. Under the two-class method, earnings per unit is calculated as if all of the earnings for the period were distributed under the terms of the partnership agreement, regardless of whether the general partner has discretion over the amount of distributions to be made in any particular period, whether those earnings would actually be distributed during a particular period from an economic or practical perspective, or whether the general partner has other legal or contractual limitations on its ability to pay distributions that would prevent it from distributing all of the earnings for a particular period.
	TEP calculates net income available to limited partners based on the distributions pertaining to the current period’s net income. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings, if any, are allocated to the general partner and limited partners in accordance with the contractual terms of the partnership agreement and as further prescribed in the FASB guidance under the two-class method.
	The two-class method does not impact TEP’s overall net income or other financial results; however, in periods in which aggregate net income exceeds its aggregate distributions for such period, it will have the impact of reducing net income per limited partner unit. This result occurs as a larger portion of TEP’s aggregate earnings, as if distributed, is allocated to the incentive distribution rights of the general partner, even though TEP makes distributions on the basis of available cash and not earnings. In periods in which TEP’s aggregate net income does not exceed its aggregate distributions for such period, the two-class method does not have any impact on our calculation of earnings per limited partner unit.
	Basic earnings per unit is computed by dividing net earnings attributable to unitholders by the weighted average number of units outstanding during each period. Diluted earnings per unit reflects the potential dilution of common equivalent units that could occur if equity participation units are converted into common units.
	All net income or loss from Trailblazer prior to its acquisition on April 1, 2014 and Pony Express prior to its acquisition effective September 1, 2014 is allocated to predecessor operations in the table below. Historical earnings of transferred businesses for periods prior to the date of the common control drop-down transaction are solely those of the general partner and, therefore we have appropriately excluded any allocation to the limited partner units when determining net income available to common and subordinated unitholders. We present the financial results of any transferred business prior to the drop down transaction date in the line item "Predecessor operations interest in net (income) loss" in the table below.
	The following table illustrates the Partnership’s calculation of net income per common and subordinated unit for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
		2015			2014
		(in thousands, except per unit amounts)
	Net Income	$	22,990		$	16,617
	Net loss attributable to noncontrolling interests	9,329			507
	Net Income attributable to partners	32,319			17,124
	Predecessor operations interest in net income	—			(4,224		)
	General partner interest in net income	(7,438		)	(382		)
	Common and subordinated unitholders' interest in net income	$	24,881		$	12,518
	Basic net income per common and subordinated unit	$	0.47		$	0.31
	Diluted net income per common and subordinated unit	$	0.46		$	0.3
	Basic average number of common and subordinated units outstanding	52,727			40,500
	Equity Participation Unit equivalent units	1,267			772
	Diluted average number of common and subordinated units outstanding	53,994			41,272

Regulatory_Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2015
Regulatory Matters [Abstract]
Regulatory Matters	Pony Express Abandonment – FERC Docket CP12-495
	On August 6, 2012, Tallgrass Interstate Gas Transmission, LLC, or TIGT, which owns the TIGT System, filed an application to: (1) abandon for FERC purposes approximately 433 miles of mainline natural gas pipeline facilities, along with associated rights of way and other related equipment (collectively, the "Pony Express Assets"), and the natural gas service therefrom, by transferring those assets to Pony Express, which subsequently converted the Pony Express Assets into crude oil pipeline facilities; and (2) construct and operate certain replacement-type facilities necessary to continue service to existing natural gas firm transportation customers following the conversion, which we refer to as the Replacement Gas Facilities. This project is referred to as the "Pony Express Abandonment." The FERC abandonment does not constitute an abandonment for accounting purposes. Pursuant to the terms of the Purchase and Sale Agreement filed with the FERC and cited by the FERC in approving the Pony Express Abandonment, Pony Express is required to reimburse TIGT for the net book value of the Pony Express Assets plus other TIGT incurred costs required to construct the Replacement Gas Facilities and to arrange substitute gas transportation services to certain TIGT shippers.
	The Pony Express Abandonment and completion of the Pony Express Project by Pony Express re-deployed existing pipeline assets to meet the growing market need to transport oil supplies while at the same time continuing to operate TIGT’s natural gas transportation facilities to meet all current and expected needs of its natural gas customers. By a FERC order issued September 12, 2013, TIGT was granted authorization to abandon the Pony Express Assets and construct the Replacement Gas Facilities. On October 7, 2013 TIGT commenced the mobilization of personnel and equipment for the construction of the Replacement Gas Facilities necessary to complete the Pony Express Abandonment to continue service to existing TIGT customers. In December 2013, TIGT removed the Pony Express Assets from gas service and sold those assets to Pony Express. On May 1, 2014, TIGT commenced commercial service through all of the Replacement Gas Facilities, with the exception of Units 3 and 4 at the Tescott Compressor Station. Service through Units 3 and 4 at the Tescott Compressor Station commenced on May 30, 2014.
	Trailblazer
	2013 Rate Case Filing - Docket No. RP13-1031
	On July 1, 2013, Trailblazer made a rate filing with the FERC pursuant to Section 4 of the Natural Gas Act in Docket No. RP13-1031. In this filing, Trailblazer proposed an overall cost of service of $25.7 million, an increase of the base rates, rolled-in base and fuel rates, an overall rate of return of 10.94% and new depreciation rates. On July 31, 2013, the FERC issued an order accepting Trailblazer’s filing and suspending the filed tariff rates, subject to refund, for the full statutorily permitted five-month suspension period and setting certain issues for hearing. The FERC resolved the non-rate aspects of Trailblazer’s rate case in an order dated December 30, 2013.
	In conjunction with this filing for rolled-in fuel rates, Trailblazer elected to not seek recovery of unrecovered fuel costs incurred prior to January 1, 2014. Consequently, Trailblazer has recognized expenses related to unrecovered fuel costs of $578,000 for the period from November 13, 2012 to December 31, 2012, $6.0 million for period from January 1, 2012 to November 12, 2012 and $8.4 million during the year ended December 31, 2013.
	On January 22, 2014, Trailblazer, the FERC’s Trial Staff, and the active parties in the pipeline’s general rate case finalized a settlement in principle resolving the pending rate issues, including: (i) establishing transportation rates, as well as fuel and lost and unaccounted for charges; (ii) providing a limited profit sharing arrangement for certain revenues earned from interruptible and short-term firm transport; and (iii) setting the minimum and maximum time that can elapse before Trailblazer’s next rate case at the FERC. Trailblazer filed a motion with FERC’s Chief Administrative Law Judge to accept the settlement rates on an interim basis ("Interim Rates") while the participants finalized a definitive settlement. The Chief Administrative Law Judge accepted the Interim Rates effective February 1, 2014. On February 24, 2014, Trailblazer filed an uncontested offer of settlement ("Stipulation and Agreement") among active party shippers. The Stipulation and Agreement established the Interim Rates as final settlement rates effective February 1, 2014, subject to the issuance of refunds to certain shippers for January 2014 transportation services and revised fuel and lost and unaccounted for rates, effective July 1, 2014. On March 11, 2014, the Presiding Administrative Law Judge certified the Stipulation and Agreement. On May 29, 2014, the FERC approved the Stipulation and Agreement. On June 30, 2014, Trailblazer filed tariff sheets to implement the Stipulation and Agreement effective July 1, 2014. Estimated refunds were reserved from revenues recorded in January 2014. On July 1, 2014, Trailblazer submitted refunds to its customers for amounts collected in excess of amounts that would have been collected under the Settlement Rates, with interest, and on July 18, 2014, filed a report of refunds with the FERC. The FERC issued orders accepting the tariff sheets with the requested effective date of July 1, 2014 and accepting the refund report filing on July 25, 2014 and August 7, 2014, respectively.
	2015 Annual Fuel Tracker Filing - Docket No. RP15-841-000
	On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. This filing incorporates the revised fuel tracker and power cost tracker mechanisms agreed to in the 2013 Rate Case Filing settlement.
	Pony Express
	In anticipation of placing the Pony Express System into service, several petitions for declaratory orders were submitted to the FERC by Pony Express and certain upstream pipelines interconnected with the Pony Express System to address considerations related to the Pony Express System and other matters. In response to these petitions, the FERC issued three declaratory orders (two in 2012 and one in 2014) approving the proposed rate structures and terms of service for the Pony Express System.
	On September 19, 2014 Pony Express filed with the FERC to adopt a tariff for initial local Non Contract Rates as well as initial Rules and Regulations in accordance with the Interstate Commerce Act to be effective starting on October 1, 2014. Local Contract Tariff rates were filed with the FERC on October 29, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express System from the Belle Fourche Pipeline were filed on October 16, 2014 to be effective starting November 1, 2014. Joint Contract Tariff rates for oil received into the Pony Express pipeline system from Hiland Pipeline Company were filed on February 27, 2015 and effective April 1, 2015.
	Other Regulatory Matters
	There are currently no proceedings challenging the rates of Pony Express, TIGT, or Trailblazer. Regulators, as well as shippers, do have rights, under circumstances prescribed by applicable regulations, to challenge the rates that TIGT and Trailblazer charge. Further, the statute governing service by Pony Express allows parties having standing to file complaints in regard to existing tariff rates and provisions. If the complaint is not resolved, the FERC may conduct a hearing and order a crude oil pipeline to make reparations going back for up to two years prior to the date on which a complaint was filed if a rate is found to be unjust and unreasonable. TEP can provide no assurance that current rates will remain unchallenged. Any successful challenge could have a material, adverse effect on TEP’s future earnings and cash flows.

Legal_and_Environmental_Matter

Legal and Environmental Matters	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Legal and Environmental Matters	Legal
	In addition to the matters discussed below, TEP is a defendant in various lawsuits arising from the day-to-day operations of its business. Although no assurance can be given, TEP believes, based on its experiences to date, that the ultimate resolution of such routine items will not have a material adverse impact on its business, financial position, results of operations or cash flows.
	TEP has evaluated claims in accordance with the accounting guidance for contingencies that it deems both probable and reasonably estimable and, accordingly, had aggregate reserves for legal claims of approximately $0.6 million as of March 31, 2015 and December 31, 2014.
	TIGT
	Prairie Horizon
	On July 3, 2014, Prairie Horizon Agri-Energy LLC ("Prairie Horizon") filed an action in the District Court of Phillips County, Kansas against TIGT seeking damages from an alleged intrusion of foreign material and oil from TIGT into Prairie Horizon's ethanol plant. The matter was removed to the US District Court for the District of Kansas. Prairie Horizon asserts that this intrusion caused substantial damage to Prairie Horizon's ethanol production facilities and resulted in corresponding business income losses. Prairie Horizon also claims that the intrusion was a violation of TIGT's FERC Gas Tariff. Prairie Horizon alleges that it has suffered damages in the amount of approximately $2.0 million. TIGT believes Prairie Horizon's claims are without merit and plans to vigorously contest all of the claims in this matter.
	System Failure
	On June 13, 2013, a failure occurred on a segment of the TIGT pipeline system in Goshen County, Wyoming, resulting in the release of natural gas. The line was promptly brought back into service and the failure did not cause any known injuries, fatalities, fires or evacuations. TEP is currently working with PHMSA to develop a plan to close the Corrective Action Order received from PHMSA regarding the Goshen County failure and does not believe the cost of anticipated remediation activities will be material.
	Pony Express
	System Failures
	On August 31, 2014, a leak occurred at the Sterling Pump Station on the Pony Express System in Logan County, Colorado, which resulted in a release of approximately 200 bbls of crude oil. The spill was entirely contained on TEP property and the costs to remediate were not material. In April 2015, PHSMA granted TEP's request to consider the Sterling Pump Station incident closed with no further action.
	On March 12, 2015, an event occurred at the Yoder Pump Station in Goshen County, Wyoming, related to repair and replacement activities resulting in a spill of approximately 300 bbls of crude oil. TEP has presented its incident investigation findings to PHMSA and is currently working with PHMSA to resolve the matter. TEP does not believe the cost of anticipated remediation activities will be material.
	Environmental
	TEP is subject to a variety of federal, state and local laws that regulate permitted activities relating to air and water quality, waste disposal, and other environmental matters. TEP believes that compliance with these laws will not have a material adverse impact on its business, cash flows, financial position or results of operations. However, there can be no assurances that future events, such as changes in existing laws, the promulgation of new laws, or the development of new facts or conditions will not cause TEP to incur significant costs. TEP had environmental accruals of $5.2 million and $5.3 million at March 31, 2015 and December 31, 2014, respectively.
	TMID
	Casper Plant, U.S. EPA Notice of Violation
	In August 2011, the U.S. EPA and the Wyoming Department of Environmental Quality ("WDEQ") conducted an inspection of the Leak Detection and Repair ("LDAR") Program at the Casper Gas Plant in Wyoming. In September 2011, TMID received a letter from the U.S. EPA alleging violations of the Standards of Performance of Equipment Leaks for Onshore Natural Gas Processing Plant requirements under the Clean Air Act. TMID received a letter from the U.S. EPA concerning settlement of this matter in April 2013 and received additional settlement communications from the U.S. EPA and Department of Justice beginning in July 2014. Settlement negotiations are continuing, including attempted resolution of more recently identified LDAR issues.
	Casper Mystery Bridge Superfund Site
	The Casper Gas Plant is part of the Mystery Bridge Road/U.S. Highway 20 Superfund Site also known as Casper Mystery Bridge Superfund Site. Remediation work at the Casper Gas Plant has been completed and TEP has requested that the portion of the site attributable to TEP be delisted from the National Priorities List.
	Casper Gas Plant
	On November 25, 2014, WDEQ issued a Notice of Violation for violations of Part 60 Subpart OOOO related to the Depropanizer project (wv-14388, issued 7/9/13) in Docket No. 5506-14. TMID had discussed the issues in a meeting with WDEQ in Cheyenne on November 17, 2014, and submitted a disclosure on November 20, 2014 detailing the regulatory issues and potential violations. The project triggered a modification of Subpart OOOO for the entire plant. The project equipment as well as plant equipment subjected to Subpart OOOO was not monitored timely, and initial notification was not made timely. Settlement negotiations with WDEQ are currently ongoing.

Reporting_Segments

Reporting Segments	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Reporting Segments	TEP’s operations are located in the United States. TEP is organized into three reporting segments: (1) Natural Gas Transportation & Logistics, (2) Crude Oil Transportation & Logistics, and (3) Processing & Logistics.
	Natural Gas Transportation & Logistics
	The Natural Gas Transportation & Logistics segment is engaged in ownership and operation of FERC-regulated interstate natural gas pipelines and integrated natural gas storage facilities that provide services to on-system customers (such as third-party LDCs), industrial users and other shippers. As discussed in Note 2 – Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Trailblazer.
	Crude Oil Transportation & Logistics
	The Crude Oil Transportation & Logistics segment is engaged in ownership, construction, and operation of a FERC-regulated crude oil pipeline to serve the Bakken Shale and other nearby oil producing basins. The Pony Express System was placed in service in October 2014. The Crude Oil Transportation & Logistics segment also includes the construction of a lateral pipeline in Northeast Colorado, which will interconnect with the Pony Express System just east of Sterling, Colorado and is expected to be placed in service during the first half of 2015. As discussed in Note 2 – Summary of Significant Accounting Policies, results for prior periods have been recast to reflect the operations of Pony Express.
	Processing & Logistics
	The Processing & Logistics segment is engaged in ownership and operation of natural gas processing, treating and fractionation facilities that produce NGLs and residue gas that is sold in local wholesale markets or delivered into pipelines for transportation to additional end markets, as well as water business services provided primarily to the oil and gas exploration and production industry.
	Corporate and Other
	Corporate and Other includes corporate overhead costs that are not directly associated with the operations of TEP’s reportable segments, such as interest and fees associated with TEP’s revolving credit facility, public company costs reimbursed to TD, and equity-based compensation expense.
	These segments are monitored separately by management for performance and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for their respective operations.
	TEP considers Adjusted EBITDA as its primary segment performance measure as TEP believes it is the most meaningful measure to assess TEP’s financial condition and results of operations as a public entity. Adjusted EBITDA, a non-GAAP measure, is defined as net income excluding the impact of interest, income taxes, depreciation and amortization, non-cash income or loss related to derivative instruments, non-cash long-term compensation expense, impairment losses, gains or losses on asset or business disposals or acquisitions, gains or losses on the repurchase, redemption or early retirement of debt, and earnings from unconsolidated investments, but including the impact of distributions from unconsolidated investments.
	The following tables set forth TEP’s segment information for the periods indicated:
		Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
	Revenue:	Total			Inter-			External			Total			Inter-			External
		Revenue			Segment			Revenue			Revenue			Segment			Revenue
					(in thousands)									(in thousands)
	Natural Gas Transportation & Logistics	$	33,610		$	(1,346	)	$	32,264		$	39,631		$	(1,255	)	$	38,376
	Crude Oil Transportation & Logistics	50,381			—			50,381			—			—			—
	Processing & Logistics	32,030			—			32,030			56,403			—			56,403
	Corporate and Other	—			—			—			—			—			—
	Total revenue	$	116,021		$	(1,346	)	$	114,675		$	96,034		$	(1,255	)	$	94,779
		Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
	Adjusted EBITDA:	Total			Inter-			External			Total			Inter-			External
		Adjusted			Segment			Adjusted			Adjusted			Segment			Adjusted
		EBITDA						EBITDA			EBITDA						EBITDA
		(in thousands)									(in thousands)
	Natural Gas Transportation & Logistics	$	19,246		$	(1,346	)	$	17,900		$	19,862		$	(1,255	)	$	18,607
	Crude Oil Transportation & Logistics	25,506			1,346			26,852			—			—			—
	Processing & Logistics	8,718			—			8,718			9,596			—			9,596
	Corporate and Other	(635		)	—			(635		)	(625		)	—			(625		)
	Reconciliation to Net Income:
	Interest expense, net							3,440									1,294
	Depreciation and amortization expense, net of noncontrolling interest							20,533									7,804
	Non-cash loss from asset sales							4,483									—
	Non-cash (gain) loss related to derivative instruments							(90		)							351
	Non-cash compensation expense							1,527									941
	Distributions from unconsolidated investment							—									508
	Equity in earnings of unconsolidated investment							—									(444		)
	Non-cash loss allocated to noncontrolling interest							(9,377		)							—
	Net Income attributable to partners							$	32,319								$	17,124
		Three Months Ended March 31,
	Capital Expenditures:	2015			2014
					(in thousands)
	Natural Gas Transportation & Logistics	$	3,865		$	9,626
	Crude Oil Transportation & Logistics	6,480			196,437
	Processing & Logistics	2,955			3,048
	Corporate and Other	—			—
	Total capital expenditures	$	13,300		$	209,111
	Assets:	31-Mar-15			31-Dec-14
		(in thousands)
	Natural Gas Transportation & Logistics	$	719,510		$	716,106
	Crude Oil Transportation & Logistics	1,391,417			1,394,793
	Processing & Logistics	337,303			340,620
	Corporate and Other	5,321			5,678
	Total assets	$	2,453,551		$	2,457,197

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Trailblazer Fuel Tracker Filing
	On April 1, 2015, Trailblazer made its annual fuel tracker filing with a proposed effective date of May 1, 2015 in Docket No. RP15-841-000. See Note 12 - Regulatory Matters for details.
	Tallgrass Energy GP, LP Initial Public Offering
	On May 6, 2015, Tallgrass Energy GP, LP (“TEGP”), a newly formed entity that is expected to own, directly or indirectly, all of TEP’s incentive distribution rights, TEP’s general partner interest, and 20,000,000 common units representing limited partner interests in TEP, announced the pricing of its initial public offering of 41,500,000 Class A shares representing limited partner interests in TEGP at $29.00 per Class A share. TEGP granted the underwriters an option to purchase up to an additional 6,225,000 Class A shares, which was exercised on May 7, 2015. TEGP anticipates closing its initial public offering on May 12, 2015.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	These unaudited condensed consolidated financial statements and related notes for the three months ended March 31, 2015 and 2014 were prepared in accordance with the accounting principles contained in the Financial Accounting Standards Board’s Accounting Standards Codification, the single source of generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from audited financial statements but does not include disclosures required by GAAP for annual periods. The unaudited condensed consolidated financial statements for the three months ended ended March 31, 2015 and 2014 include all normal, recurring adjustments and disclosures that we believe are necessary for a fair presentation of the results for the interim periods. In this report, the Financial Accounting Standards Board is referred to as the FASB and the FASB Accounting Standards Codification is referred to as the Codification or ASC. Certain prior period amounts have been reclassified to conform to the current presentation.
	TEP’s financial results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2015. These unaudited condensed consolidated financial statements should be read in conjunction with TEP’s audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”) filed with the United States Securities and Exchange Commission (the “SEC”) on February 19, 2015.
	The accompanying condensed consolidated financial statements of TEP include historical cost-basis accounts of the assets of Trailblazer for the periods prior to April 1, 2014, the date TEP acquired Trailblazer from TD, and Pony Express for the periods prior to September 1, 2014, the date TEP acquired a controlling 33.3% membership interest in Pony Express, and include charges from TD for direct costs and allocations of indirect corporate overhead. Management believes that the allocation methods are reasonable, and that the allocations are representative of costs that would have been incurred on a stand-alone basis.
Consolidation	As further discussed in Note 4 – Acquisitions, TEP closed the acquisition of Trailblazer on April 1, 2014 and the acquisition of a 33.3% membership interest in Pony Express effective September 1, 2014. As the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express are considered transactions between entities under common control, and a change in reporting entity, the financial information presented for prior periods has been recast to include Trailblazer and the initial 33.3% membership interest in Pony Express for all periods presented. The acquisition of the additional 33.3% membership interest in Pony Express represents a transaction between entities under common control and an acquisition of noncontrolling interests. As a result, financial information for periods prior to March 1, 2015 have not been recast to reflect the additional 33.3% membership interest.
	The condensed consolidated financial statements include the accounts of TEP and its subsidiaries and controlled affiliates. Significant intra-entity items have been eliminated in the presentation. Net equity contributions of the Predecessor Entities included in the condensed consolidated statements of cash flows represent transfers of cash as a result of TD’s centralized cash management systems prior to April 1, 2014 for Trailblazer and September 1, 2014 for Pony Express, under which cash balances were swept daily and recorded as loans from the subsidiaries to TD. These loans were then periodically recorded as equity distributions. Pony Express participates in a cash management agreement with TD, which holds a 33.3% common membership interest in Pony Express, under which cash balances are swept daily and recorded as loans from Pony Express to TD.
	Net income or loss from consolidated subsidiaries that are not wholly-owned by TEP is attributed to TEP and noncontrolling interests. This is done in accordance with substantive profit sharing arrangements, which generally follow the allocation of cash distributions and may not follow the respective ownership percentages held by TEP. Concurrent with TEP's acquisition of an initial 33.3% membership interest in Pony Express effective September 1, 2014, TEP, TD, and Pony Express entered into the Second Amended and Restated Limited Liability Agreement of Tallgrass Pony Express Pipeline, LLC ("the Second Amended Pony Express LLC Agreement"), which provided TEP a minimum quarterly preference payment of $16.65 million (prorated to approximately $5.4 million for the quarter ended September 30, 2014) through the quarter ending September 30, 2015. Effective March 1, 2015 with TEP's acquisition of an additional 33.3% membership interest in Pony Express, the Second Amended Pony Express LLC Agreement was further amended (as amended, "the Pony Express LLC Agreement") to increase the minimum quarterly preference payment to $36.65 million (prorated to approximately $23.5 million for the quarter ended March 31, 2015) and extend the term of the preference period through the quarter ending December 31, 2015. The Pony Express LLC Agreement provides that the net income or loss of Pony Express be allocated, to the extent possible, consistent with the allocation of Pony Express cash distributions. Under the terms of the Pony Express LLC Agreement, Pony Express distributions and net income for periods beginning after December 31, 2015 will be attributed to TEP and noncontrolling interests in accordance with the respective ownership interests.
	A variable interest entity ("VIE") is a legal entity that possesses any of the following characteristics: an insufficient amount of equity at risk to finance its activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or equity owners who do not have the obligation to absorb expected losses or the right to receive the expected residual returns of the entity. Companies are required to consolidate a VIE if they are its primary beneficiary, which is the enterprise that has a variable interest that could be significant to the VIE and the power to direct the activities that most significantly impact the entity’s economic performance. TEP has presented separately in its condensed consolidated balance sheets, to the extent material, the assets of its consolidated VIE that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of TEP's consolidated VIE for which creditors do not have recourse to TEP's general credit. Pony Express is considered to be a VIE under the applicable authoritative guidance. Based on a qualitative analysis in accordance with the applicable authoritative guidance, TEP has determined that it is the primary beneficiary as it has the power to direct matters that most significantly impact the activities of Pony Express and has the right to receive benefits of Pony Express that could potentially be significant to Pony Express. TEP has consolidated Pony Express accordingly. For additional information see Note 3 – Variable Interest Entities.
Use of Estimates	Use of Estimates
	Certain amounts included in or affecting these consolidated financial statements and related disclosures must be estimated, requiring management to make certain assumptions with respect to values or conditions which cannot be known with certainty at the time the financial statements are prepared. These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses during the reporting period, and the disclosure of contingent assets and liabilities at the date of the financial statements. Management evaluates these estimates on an ongoing basis, utilizing historical experience, consultation with experts and other methods it considers reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from these estimates. Any effects on TEP’s business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.
Accounting Pronouncements Issued But Not Yet Effective	Accounting Pronouncements Issued But Not Yet Effective
	Accounting Standards Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)"
	In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 provides a comprehensive and converged set of principles-based revenue recognition guidelines which supersede the existing industry and transaction-specific standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, entities must apply a five step process to (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 also mandates disclosure of sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The disclosure requirements include qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract.
	The amendments in ASU 2014-09 are effective for public entities for annual reporting periods beginning after December 15, 2016, and for interim periods within that reporting period. Early application is not permitted. TEP is currently evaluating the impact of ASU 2014-09.
	ASU No. 2014-12, "Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period"
	In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718), Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides explicit guidance on accounting for share-based payments requiring a specific performance target to be achieved in order for employees to become eligible to vest in the awards when that performance target may be achieved after the requisite service period for the award. The ASU requires that such performance targets be treated as a performance condition, and should not be reflected in the estimate of the grant-date fair value of the award. Instead, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved.
	ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. The adoption of ASU 2014-12 is not expected to have a material impact on TEP's financial position and results of operations.
	ASU No. 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis"
	In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 will change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 will modify the evaluation of whether limited partnerships and other similar legal entities are considered VIEs or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, and change certain aspects of the consolidation analysis for reporting entities that are involved with VIEs, particularly for those with fee arrangements and related party relationships.
	The amendments in ASU 2015-02 are effective for public entities for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early application is permitted, including adoption in an interim period. TEP is currently evaluating the impact of ASU 2015-02.

Variable_Interest_Entity_Table

Variable Interest Entity (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities [Table Text Block]	The carrying amounts and classifications of the Pony Express assets and liabilities included in TEP's condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Current assets	$	27,315	$	93,019
	Noncurrent assets	1,362,803		1,300,816
	Total assets	$	1,390,118	$	1,393,835
	Current liabilities	$	57,336	$	52,547
	Total liabilities	$	57,336	$	52,547

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]
Impact of Adjustments Related to Transaction Among Entities Under Common Control, Income Statement	The following tables present the previously reported condensed consolidated statements of income for the three months ended March 31, 2014, adjusted for the acquisitions of Trailblazer and the initial 33.3% membership interest in Pony Express:
		Three Months Ended March 31, 2014
		TEP			Consolidate Trailblazer Pipeline Company LLC		Consolidate Tallgrass Pony Express Pipeline, LLC			TEP (As currently reported)
		(in thousands)
	Revenues:
	Natural gas liquids sales	$	48,907		$	—	$	—		$	48,907
	Natural gas sales	2,196			2,612		—			4,808
	Transportation services	27,051			7,053		—			34,104
	Processing and other revenues	6,808			152		—			6,960
	Total Revenues	84,962			9,817		—			94,779
	Operating Costs and Expenses:
	Cost of sales	45,543			2,663		—			48,206
	Cost of transportation services	4,903			214		—			5,117
	Operations and maintenance	7,286			727		—			8,013
	Depreciation and amortization	6,514			1,038		757			8,309
	General and administrative	6,201			448		—			6,649
	Taxes, other than income taxes	1,456			500		—			1,956
	Total Operating Costs and Expenses	71,903			5,590		757			78,250
	Operating Income (Loss)	13,059			4,227		(757		)	16,529
	Other (Expense) Income:
	Interest (expense) income, net	(1,324		)	31		(3		)	(1,296		)
	Equity in earnings of unconsolidated investment	444			—		—			444
	Other income, net	721			219		—			940
	Total Other (Expense) Income	(159		)	250		(3		)	88
	Net Income (Loss)	12,900			4,477		(760		)	16,617
	Net loss attributable to noncontrolling interests	—			—		507			507
	Net income (loss) attributable to partners	$	12,900		$	4,477	$	(253	)	$	17,124

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Schedule of Transactions with Affiliated Companies	Totals of transactions with affiliated companies are as follows:
		Three Months Ended March 31,
		2015		2014
		(in thousands)
	Charges to TEP: (1)
	Property, plant and equipment, net	$	1,307	$	3,400
	Operation and maintenance	$	5,423	$	4,348
	General and administrative	$	9,256	$	4,927
	(1)	Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.
Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets	Details of balances with affiliates included in "Receivable from related party" and "Accounts payable to related parties" in the condensed consolidated balance sheets are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Receivable from related party:
	Tallgrass Operations, LLC	$	—	$	73,393
	Total receivable from related party	$	—	$	73,393
	Accounts payable to related parties:
	Tallgrass Operations, LLC	$	2,980	$	3,894
	Rockies Express Pipeline LLC	11		21
	Deeprock Development, LLC	9		—
	Total accounts payable to related parties	$	3,000	$	3,915
Schedule of Balances of Gas Imbalance with Affiliated Shippers	Balances of gas imbalances with affiliated shippers are as follows:
		31-Mar-15		31-Dec-14
		(in thousands)
	Affiliate gas balance receivables	$	168	$	275
	Affiliate gas balance payables	$	410	$	455

Inventory_Tables

Inventory (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Components of Inventory	The components of inventory at March 31, 2015 and December 31, 2014 consisted of the following:
		31-Mar-15		31-Dec-14
		(in thousands)
	Gas in underground storage	$	6,055	$	8,896
	Materials and supplies	4,600		3,049
	Crude oil	1,592		581
	Natural gas liquids	432		519
	Total inventory	$	12,679	$	13,045

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Components of Property Plant and Equipment	A summary of net property, plant and equipment by classification is as follows:
		31-Mar-15			31-Dec-14
		(in thousands)
	Crude oil pipelines	$	961,288		$	939,536
	Natural gas pipelines	553,425			548,482
	Processing and treating assets	237,049			241,671
	General and other	52,666			42,719
	Construction work in progress	194,638			139,873
	Accumulated depreciation and amortization	(77,390		)	(59,200		)
	Total property, plant and equipment, net	$	1,921,676		$	1,853,081

Risk_Management_Tables

Risk Management (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Contracts

The following table summarizes the fair values of TEP’s derivative contracts included in the condensed consolidated balance sheets:

Balance Sheet

31-Mar-15

31-Dec-14

Location

(in thousands)

Energy commodity derivative contracts

Current assets

$

90

$

—

Derivative Contracts Included in Consolidated Statements of Income

The following table summarizes the impact of derivative contracts for the three months ended March 31, 2015 and 2014:

Amount of gain (loss) recognized in income on derivatives

Location of

Three Months Ended March 31,

gain (loss) recognized

in income on derivatives

2015

2014

(in thousands)

Derivatives not designated as hedging contracts:

Energy commodity derivative contracts

Natural gas sales

$

90

$

(351

)

Derivative Instruments Maximum Potential Exposure To Credit Loss [Table Text Block]

The maximum potential exposure to credit losses on TEP’s derivative contracts at March 31, 2015 was:

Asset Position

(in thousands)

Gross

$

90

Netting agreement impact

—

Cash collateral held

—

Net Exposure

$

90

Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification

The following table summarizes the fair value measurements of TEP’s energy commodity derivative contracts as of March 31, 2015 based on the fair value hierarchy established by the Codification:

Asset fair value measurements using

Total

Quoted prices in

Significant

Significant

active markets

other observable

unobservable

for identical

inputs

inputs

assets

(Level 2)

(Level 3)

(Level 1)

(in thousands)

TEP as of March 31, 2015

Energy commodity derivative contracts

$

90

$

—

$

90

$

—

Longterm_Debt_Tables

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Line of Credit Facilities	The following table sets forth the outstanding borrowings, letters of credit issued, and available borrowing capacity under TEP's revolving credit facility as of March 31, 2015 and December 31, 2014:
		31-Mar-15			31-Dec-14
		(in thousands)
	Total capacity under the revolving credit facility	$	850,000		$	850,000
	Less: Outstanding borrowings under the revolving credit facility	(698,000		)	(559,000		)
	Available capacity under the revolving credit facility	$	152,000		$	291,000
Carrying Amount and Fair value of TEP's Long-term Debt	The following table sets forth the carrying amount and fair value of TEP’s long-term debt, which is not measured at fair value in the condensed consolidated balance sheets as of March 31, 2015 and December 31, 2014, but for which fair value is disclosed:
		Fair Value
		Quoted prices			Significant			Significant		Total		Carrying
		in active markets			other observable			unobservable				Amount
		for identical assets			inputs			inputs
		(Level 1)			(Level 2)			(Level 3)
		(in thousands)
	March 31, 2015	$	—		$	698,000		$	—	$	698,000	$	698,000
	December 31, 2014	$	—		$	559,000		$	—	$	559,000	$	559,000

Partnership_Equity_and_Distrib1

Partnership Equity and Distributions (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Summary of Distributions	The following table shows the distributions for the periods indicated:
			Distributions
			Limited Partners		General Partner						Distributions
			Common and								per Limited
	Three Months Ended	Date Paid	Subordinated Units		Incentive Distribution Rights		General Partner Units		Total		Partner Unit
			(in thousands, except per unit amounts)
	31-Mar-15	May 14, 2015 (1)	$	31,322	$	6,934	$	530	$	38,786	$	0.52
	31-Dec-14	February 13, 2015	23,782		4,039		473		28,294		0.485
	30-Sep-14	November 14, 2014	20,092		1,208		363		21,663		0.41
	30-Jun-14	August 14, 2014	18,596		758		330		19,684		0.38
	March 31, 2014	May 14, 2014	13,288		126		274		13,688		0.325

Net_Income_per_Limited_Partner1

Net Income per Limited Partner Unit (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Summary of Net Income Per Limited Partner Unit	The following table illustrates the Partnership’s calculation of net income per common and subordinated unit for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
		2015			2014
		(in thousands, except per unit amounts)
	Net Income	$	22,990		$	16,617
	Net loss attributable to noncontrolling interests	9,329			507
	Net Income attributable to partners	32,319			17,124
	Predecessor operations interest in net income	—			(4,224		)
	General partner interest in net income	(7,438		)	(382		)
	Common and subordinated unitholders' interest in net income	$	24,881		$	12,518
	Basic net income per common and subordinated unit	$	0.47		$	0.31
	Diluted net income per common and subordinated unit	$	0.46		$	0.3
	Basic average number of common and subordinated units outstanding	52,727			40,500
	Equity Participation Unit equivalent units	1,267			772
	Diluted average number of common and subordinated units outstanding	53,994			41,272

Reporting_Segments_Tables

Reporting Segments (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Summary of TEP's Segment Information of Revenue	The following tables set forth TEP’s segment information for the periods indicated:
		Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
	Revenue:	Total			Inter-			External			Total			Inter-			External
		Revenue			Segment			Revenue			Revenue			Segment			Revenue
					(in thousands)									(in thousands)
	Natural Gas Transportation & Logistics	$	33,610		$	(1,346	)	$	32,264		$	39,631		$	(1,255	)	$	38,376
	Crude Oil Transportation & Logistics	50,381			—			50,381			—			—			—
	Processing & Logistics	32,030			—			32,030			56,403			—			56,403
	Corporate and Other	—			—			—			—			—			—
	Total revenue	$	116,021		$	(1,346	)	$	114,675		$	96,034		$	(1,255	)	$	94,779
Summary of TEP's Segment Information of Earnings
		Three Months Ended March 31, 2015									Three Months Ended March 31, 2014
	Adjusted EBITDA:	Total			Inter-			External			Total			Inter-			External
		Adjusted			Segment			Adjusted			Adjusted			Segment			Adjusted
		EBITDA						EBITDA			EBITDA						EBITDA
		(in thousands)									(in thousands)
	Natural Gas Transportation & Logistics	$	19,246		$	(1,346	)	$	17,900		$	19,862		$	(1,255	)	$	18,607
	Crude Oil Transportation & Logistics	25,506			1,346			26,852			—			—			—
	Processing & Logistics	8,718			—			8,718			9,596			—			9,596
	Corporate and Other	(635		)	—			(635		)	(625		)	—			(625		)
	Reconciliation to Net Income:
	Interest expense, net							3,440									1,294
	Depreciation and amortization expense, net of noncontrolling interest							20,533									7,804
	Non-cash loss from asset sales							4,483									—
	Non-cash (gain) loss related to derivative instruments							(90		)							351
	Non-cash compensation expense							1,527									941
	Distributions from unconsolidated investment							—									508
	Equity in earnings of unconsolidated investment							—									(444		)
	Non-cash loss allocated to noncontrolling interest							(9,377		)							—
	Net Income attributable to partners							$	32,319								$	17,124
Summary of TEP's Segment Information of Assets
		Three Months Ended March 31,
	Capital Expenditures:	2015			2014
					(in thousands)
	Natural Gas Transportation & Logistics	$	3,865		$	9,626
	Crude Oil Transportation & Logistics	6,480			196,437
	Processing & Logistics	2,955			3,048
	Corporate and Other	—			—
	Total capital expenditures	$	13,300		$	209,111
	Assets:	31-Mar-15			31-Dec-14
		(in thousands)
	Natural Gas Transportation & Logistics	$	719,510		$	716,106
	Crude Oil Transportation & Logistics	1,391,417			1,394,793
	Processing & Logistics	337,303			340,620
	Corporate and Other	5,321			5,678
	Total assets	$	2,453,551		$	2,457,197

Description_of_Business_Additi

Description of Business - Additional Information (Detail)	3 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Feb. 17, 2015
Organization [Line Items]
General partner units issued	834,391		834,391
General partner interest in TEP	1.40%
Ownership Interests Held By Public [Member]
Organization [Line Items]
Unitholders units outstanding (in shares)	33,878,625
Common Unitholder Percentage Ownership	56.20%
Aggregate outstanding common, subordinated and general partner units	55.50%
Ownership Interests Held By TD
Organization [Line Items]
Unitholders units outstanding (in shares)	26,355,480
Common Unitholder Percentage Ownership	43.80%
Aggregate outstanding common, subordinated and general partner units	43.20%
Limited Partners Subordinated Units Converted					16,200,000
Pony Express Pipeline
Organization [Line Items]
Variable Interest Entity, Ownership Percentage		33.30%	33.30%
Pony Express Pipeline
Organization [Line Items]
Variable Interest Entity, Ownership Percentage	66.70%	33.30%		33.30%

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Mar. 31, 2015
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%	33.30%
Equity interest held by noncontrolling interests				33.30%
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%		33.30%	66.70%
Preferred Membership, Percentage Acquired	100.00%		33.30%
Minimum Quarterly Distribution Required by Partnership Agreement	16.65		$36.65
Minimum Monthly Distribution Required by Partnership Agreement	5.4		$23.50

Variable_Interest_Entity_Detai

Variable Interest Entity (Details) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 01, 2014	Dec. 31, 2014	Mar. 01, 2015	Mar. 31, 2015
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%	33.30%
Funds Maintained by Pony to Fund Remaining Construction	$270
Cash Contributed to Pony	570
Pony Express Pipeline
Business Acquisition [Line Items]
Variable Interest Entity, Ownership Percentage	33.30%		33.30%	66.70%
Preferred Membership, Percentage Acquired	100.00%		33.30%
Funds Maintained by Pony to Fund Remaining Construction	270
Cash Contributed to Pony	$570

Variable_Interest_Entity_Pony_

Variable Interest Entity Pony Assets and Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Variable Interest Entity [Line Items]
Assets, Current	$63,552	$132,281
Total Assets	2,453,551	2,457,197
Liabilities, Current	104,386	96,568
Pony Express Pipeline
Variable Interest Entity [Line Items]
Assets, Current	27,315	93,019
Assets, Noncurrent	1,362,803	1,300,816
Total Assets	1,390,118	1,393,835
Liabilities, Current	57,336	52,547
Liabilities	$57,336	$52,547

Acquisitions_Details

Acquisitions (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	13-May-14	Apr. 01, 2014	Mar. 01, 2015	Sep. 01, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
General partner units issued	834,391						834,391
Cash Contributed to TD	$700,000,000	$0
Equity interest acquired			80.00%
Business Acquisition, Pro Forma Revenue		96,700,000
Business Acquisition, Pro Forma Net Income (Loss)		17,400,000
Water Solutions [Member]
Business Acquisition [Line Items]
Equity interest acquired			80.00%
Acquisition of Water Solutions			7,600,000
Equity interest held by noncontrolling interests			20.00%
Acquisition, noncontrolling interest, fair value			1,400,000
Trailblazer
Business Acquisition [Line Items]
Date of acquisition				1-Apr-14
Total consideration				164,000,000
Acquisitions				150,000,000
Common and subordinated units issued, units				385,140
Common unit, issuance value				14,000,000
General partner units issued				7,860
General Partners capital account partnership interest percentage				2.00%
Pony Express Pipeline
Business Acquisition [Line Items]
Date of acquisition					1-Mar-15	1-Sep-14
Total consideration						600,000,000
Acquisitions	324,328,000					-3,000,000
Common and subordinated units issued, units						70,340
Variable Interest Entity, Ownership Percentage	66.70%				33.30%	33.30%
Total Consideration Transferred Directly to TD						30,000,000
Cash Contributed to TD					700,000,000	27,000,000
Percentage of Membership Interest before Effect of New Membership						1.96%
Preferred Membership, Percentage Acquired					33.30%	100.00%
Cash Contributed to Pony						570,000,000
Cash contributed to TD as part of Pony acquisition						300,000,000
Funds Maintained by Pony to Fund Remaining Construction						270,000,000
Minimum Quarterly Distribution Required by Partnership Agreement					36,650,000	16,650,000
Minimum Monthly Distribution Required by Partnership Agreement					23,500,000	5,400,000
Grasslands Water Services I, LLC [Member]
Business Acquisition [Line Items]
Equity interest ownership percentage							50.00%
Equity interest transferred as part of acquisition			50.00%
Acquisition fair value			11,900,000
Gain on remeasurement of unconsolidated investment			9,400,000
General Partner
Business Acquisition [Line Items]
General Partners' contributed capital				263,000
General Partner | Pony Express Pipeline
Business Acquisition [Line Items]
Acquisitions	$324,328,000
Grasslands Water Services I, LLC [Member] | BNN Energy LLC [Member]
Business Acquisition [Line Items]
Equity interest transferred as part of acquisition			50.00%
Alpha Reclaim Technology, LLC [Member] | BNN Energy LLC [Member]
Business Acquisition [Line Items]
Equity interest transferred as part of acquisition			100.00%

Acquisitions_Impact_of_Acquisi

Acquisitions Impact of Acquisition, Income Statement (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Natural gas liquids sales	$21,025	$48,907
Natural gas sales	844	4,808
Natural gas transportation services	32,148	34,104
Processing and other revenues	10,277	6,960
Total Revenues	114,675	94,779
Cost of sales (exclusive of depreciation and amortization shown below)	19,593	48,206
Cost of transportation services	10,715	5,117
Operations and maintenance	9,575	8,013
Depreciation and amortization	20,605	8,309
General and administrative	12,689	6,649
Taxes, other than income taxes	11,297	1,956
Total Operating Costs and Expenses	88,957	78,250
Operating Income	25,718	16,529
Interest expense, net	-3,440	-1,296
Equity in earnings of unconsolidated investment	0	444
Other Nonoperating Income (Expense)	712	940
Total Other (Expense) Income	-2,728	88
Net income	22,990	16,617
Net Income (Loss) Attributable to Noncontrolling Interest	9,329	507
Net income attributable to partners	32,319	17,124
Tallgrass Energy Partners [Member]
Business Acquisition [Line Items]
Natural gas liquids sales		48,907
Natural gas sales		2,196
Natural gas transportation services		27,051
Processing and other revenues		6,808
Total Revenues		84,962
Cost of sales (exclusive of depreciation and amortization shown below)		45,543
Cost of transportation services		4,903
Operations and maintenance		7,286
Depreciation and amortization		6,514
General and administrative		6,201
Taxes, other than income taxes		1,456
Total Operating Costs and Expenses		71,903
Operating Income		13,059
Interest expense, net		-1,324
Equity in earnings of unconsolidated investment		444
Other Nonoperating Income (Expense)		721
Total Other (Expense) Income		-159
Net income		12,900
Net Income (Loss) Attributable to Noncontrolling Interest		0
Net income attributable to partners		12,900
Trailblazer
Business Acquisition [Line Items]
Natural gas liquids sales		0
Natural gas sales		2,612
Natural gas transportation services		7,053
Processing and other revenues		152
Total Revenues		9,817
Cost of sales (exclusive of depreciation and amortization shown below)		2,663
Cost of transportation services		214
Operations and maintenance		727
Depreciation and amortization		1,038
General and administrative		448
Taxes, other than income taxes		500
Total Operating Costs and Expenses		5,590
Operating Income		4,227
Interest expense, net		31
Equity in earnings of unconsolidated investment		0
Other Nonoperating Income (Expense)		219
Total Other (Expense) Income		250
Net income		4,477
Net Income (Loss) Attributable to Noncontrolling Interest		0
Net income attributable to partners		4,477
Pony Express Pipeline
Business Acquisition [Line Items]
Natural gas liquids sales		0
Natural gas sales		0
Natural gas transportation services		0
Processing and other revenues		0
Total Revenues		0
Cost of sales (exclusive of depreciation and amortization shown below)		0
Cost of transportation services		0
Operations and maintenance		0
Depreciation and amortization		757
General and administrative		0
Taxes, other than income taxes		0
Total Operating Costs and Expenses		757
Operating Income		-757
Interest expense, net		-3
Equity in earnings of unconsolidated investment		0
Other Nonoperating Income (Expense)		0
Total Other (Expense) Income		-3
Net income		-760
Net Income (Loss) Attributable to Noncontrolling Interest		507
Net income attributable to partners		($253)

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Related Party Transaction [Line Items]
Interest Income, Related Party	$400,000
TEP
Related Party Transaction [Line Items]
Expected general administrative expense reimbursement	5,400,000
Pony Express Pipeline
Related Party Transaction [Line Items]
Expected general administrative expense reimbursement	5,200,000
Public Company Expense [Member]
Related Party Transaction [Line Items]
Expected public company cost reimbursement	$635,000

Related_Party_Transactions_Sch

Related Party Transactions - Schedule of Transactions with Affiliated Companies (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Operation and maintenance [Member]
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	$5,423	[1]	$4,348	[1]
General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Expenses related to transactions with affiliated companies	9,256	[1]	4,927	[1]
Property, Plant and Equipment [Member]
Related Party Transaction [Line Items]
Related Party Transaction Costs Capitalized From Transactions With Related Party	$1,307		$3,400
[1]	Charges to TEP, inclusive of Pony Express, include directly charged wages and salaries, other compensation and benefits, and shared services.

Related_Party_Transactions_Sch1

Related Party Transactions - Schedule of Balances with Affiliates Included in Accounts Receivables and Accounts Payable in Consolidated Balance Sheets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	$0	$73,393
Accounts Payable, Related Parties, Current	3,000	3,915
Total payables to affiliated companies	3,000	3,915
Tallgrass Operations, LLC [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	0	73,393
Accounts Payable, Related Parties, Current	2,980	3,894
Rockies Express Pipeline LLC [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	11	21
Deeprock Development, LLC [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	$9	$0

Related_Party_Transactions_Sch2

Related Party Transactions - Schedule of Balances of Gas Imbalance with Affiliated Shippers (Detail) (Affiliated Shippers [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Affiliated Shippers [Member]
Related Party Transaction [Line Items]
Affiliate gas balance receivables	$168	$275
Affiliate gas balance payables	$410	$455

Inventory_Inventory_Details

Inventory Inventory (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Energy Related Inventory, Natural Gas in Storage	$6,055	$8,896
Inventory, Raw Materials and Supplies, Gross	4,600	3,049
Energy Related Inventory, Crude Oil, Products and Merchandise	1,592	581
Energy Related Inventory, Natural Gas Liquids	432	519
Inventory, Net	$12,679	$13,045

Property_Plant_and_Equipment_C

Property Plant and Equipment - Components of Property Plant and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	($77,390)	($59,200)
Property, plant and equipment	1,921,676	1,853,081
Crude Oil Pipelines [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	961,288	939,536
Natural Gas Pipe Lines
Property, Plant and Equipment [Line Items]
Property , plant and equipment	553,425	548,482
Processing & Treating
Property, Plant and Equipment [Line Items]
Property , plant and equipment	237,049	241,671
General and other [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	52,666	42,719
Construction work in progress [Member]
Property, Plant and Equipment [Line Items]
Property , plant and equipment	$194,638	$139,873

Risk_Management_Schedule_of_Fa

Risk Management - Schedule of Fair Value of Derivative Contracts (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$90,000	$0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$90,000	$0
Commodity [Member] | Current Portion of Derivative Notional Amount [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nonmonetary Notional Amount	0.9

Risk_Management_Derivative_Con

Risk Management - Derivative Contracts Included in Consolidated Statement of Income (Detail) (Derivatives not designated as hedging contracts [Member], Energy commodity derivative contracts [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivatives not designated as hedging contracts [Member] | Energy commodity derivative contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	$90	($351)

Risk_Management_Derivative_Ins

Risk Management Derivative Instruments Maximum Potential Exposure To Credit Loss (Details) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Credit Derivative Netting Agreement Impact	$0
Cash Collateral for Borrowed Securities	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	$90

Risk_Management_Schedule_of_En

Risk Management - Schedule of Energy Commodity Derivative Contracts Based on Fair Value Hierarchy Established by Codification (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets at fair value	$90,000	$0
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	90,000
Derivative assets at fair value	90,000	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	90,000
Commodity Contract [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	0
Commodity Contract [Member] | Significant other observable inputs (Level 2) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	90,000
Commodity Contract [Member] | Significant unobservable inputs (Level 3) [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Asset	$0

Longterm_Debt_Additional_Infor

Long-term Debt - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Weighted average interest rate on outstanding borrowings		2.20%
Senior Revolving Credit Facility [Member] | Barclays Bank [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		850,000	$850,000
Maximum [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	5.25	4.75
Credit facility commitment fee		0.50%
Minimum [Member]
Debt Instrument [Line Items]
Consolidated interest coverage ratio		2.5
Credit facility commitment fee		0.30%

Longterm_Debt_Capacity_under_R

Long-term Debt Capacity under Revolving Credit Facility (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	($698,000)	($559,000)
Senior Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	-698,000	-559,000
Line of Credit Facility, Remaining Borrowing Capacity	152,000	291,000
Barclays Bank [Member] | Senior Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$850,000	$850,000

Longterm_Debt_Carrying_Amount_

Long-term Debt - Carrying Amount and Fair Value of TEP's Long-term Debt (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Fair Value	$698,000	$559,000
Carrying Amount	698,000	559,000
Quoted prices in active markets for identical assets (Level 1) [Member]
Debt Instrument [Line Items]
Fair Value	0	0
Significant other observable inputs (Level 2) [Member]
Debt Instrument [Line Items]
Fair Value	698,000	559,000
Significant unobservable inputs (Level 3) [Member]
Debt Instrument [Line Items]
Fair Value	$0	$0

Partnership_Equity_and_Distrib2

Partnership Equity and Distributions - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Mar. 30, 2015

Feb. 27, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Sep. 01, 2014

Dec. 31, 2014

Mar. 01, 2015

Feb. 17, 2015

Limited Partners' Capital Account [Line Items]

Distribution Made to Limited Partner, Distribution Date

14-May-15

[1]

13-Feb-15

14-Nov-14

14-Aug-14

14-May-14

Initial public offering of common units

1,200,000

10,000,000

Shares Issued, Price Per Share

$50.82

Shares Issued, Price Per Share, Net of Underwriters Discount

$49.29

Proceeds from public offerings, net of offering costs

$59,300

$492,600

$551,949

$0

Distributions per Limited Partner unit

$0.52

$0.49

$0.41

$0.38

$0.33

General partner interest in TEP

1.40%

General partner units issued

834,391

834,391

834,391

Pony Express Pipeline

Limited Partners' Capital Account [Line Items]

Variable Interest Entity, Ownership Percentage

33.30%

33.30%

Ownership Interests Held By TD

Limited Partners' Capital Account [Line Items]

Limited Partners Subordinated Units Converted

16,200,000

Common Units, Conversion Ratio

1

Minimum Quarterly Distribution [Member]

Limited Partners' Capital Account [Line Items]

Distributions per Limited Partner unit

$0.29

Second Target Distribution [Member]

Limited Partners' Capital Account [Line Items]

Increasing incentive distribution right

13.00%

Incentive distribution per unit

$0.35

Percentage of unit holders

85.00%

Percentage of general partner

15.00%

Third Target Distribution [Member]

Limited Partners' Capital Account [Line Items]

Increasing incentive distribution right

23.00%

Incentive distribution per unit

$0.43

Percentage of unit holders

75.00%

Percentage of general partner

25.00%

First Target Distribution [Member]

Limited Partners' Capital Account [Line Items]

General partner interest in TEP

2.00%

Incentive distribution per unit

$0.30

Percentage of unit holders

98.00%

Percentage of general partner

2.00%

Thereafter [Member]

Limited Partners' Capital Account [Line Items]

Increasing incentive distribution right

48.00%

Pony Express Pipeline

Limited Partners' Capital Account [Line Items]

Variable Interest Entity, Ownership Percentage

66.70%

33.30%

33.30%

Thereafter [Member]

Limited Partners' Capital Account [Line Items]

Percentage of unit holders

50.00%

Percentage of general partner

50.00%

[1]

(1)B The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

Partnership_Equity_and_Distrib3

Partnership Equity and Distributions - Summary of Distributions (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Feb. 27, 2015	Apr. 24, 2015
Distribution Made to Limited Partner [Line Items]
Contributions from Predecessor Member, net						$63,170
Shares Issued, Price Per Share							$50.82
Distribution Made to Limited Partner, Distribution Date	14-May-15	[1]	13-Feb-15	14-Nov-14	14-Aug-14	14-May-14
Distributions Limited Partners Common	31,322		23,782	20,092	18,596	13,288
Distributions declared	38,786		28,294	21,663	19,684	13,688
Distributions per Limited Partner unit	$0.52		$0.49	$0.41	$0.38	$0.33
General Partner
Distribution Made to Limited Partner [Line Items]
Contributions from Predecessor Member, net						0
Distributions General Partner Incentive	6,934		4,039	1,208	758	126
Distributions declared	$530		$473	$363	$330	$274
Common unitholders
Distribution Made to Limited Partner [Line Items]
Unitholders units issued (in shares)	60,234,105		32,834,105
Common unitholders | Subsequent Event
Distribution Made to Limited Partner [Line Items]
Unitholders units issued (in shares)								60,234,105
[1]	(1)B The distribution declared on April 14, 2015 for the first quarter of 2015 will be paid May 14, 2015 subsequent to the date of this Quarterly Report on 60,234,105 common units of record at the close of business on April 24, 2015.

Net_Income_per_Limited_Partner2

Net Income per Limited Partner Unit - Summary of Net Income Per Limited Partner Unit (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$22,990	$16,617
Net Income (Loss) Attributable to Noncontrolling Interest	9,329	507
Net income (loss)	32,319	17,124
Predecessor operations interest in net income	0	-4,224
General partner interest in net (income) loss	-7,438	-382
General partner interest in net income	$24,881	$12,518
Basic average number of common and subordinated units outstanding	$0.47	$0.31
Diluted average number of common and subordinated units outstanding	$0.46	$0.30
Basic average number of common and subordinated units outstanding	52,727	40,500
Basic average number of common and subordinated units outstanding	1,267	772
Diluted average number of common and subordinated units outstanding	53,994	41,272

Regulatory_Matters_Regulatory_

Regulatory Matters Regulatory Details (Details) (USD $)	0 Months Ended	2 Months Ended	3 Months Ended	10 Months Ended
	Jul. 01, 2013	Dec. 31, 2012	Mar. 31, 2014	Nov. 12, 2012	Aug. 06, 2012
					mi
Tallgrass Interstate Gas Transmission, LLC (TIGT) [Member]
Entity Information [Line Items]
Gas transmission lines owned					433
Trailblazer
Entity Information [Line Items]
Cost of Service used by FERC	$25,700,000
Rate of Return	10.94%
Unrecovered Fuel Costs		$578,000	$8,400,000	$6,000,000

Legal_and_Environmental_Matter1

Legal and Environmental Matters - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Mar. 12, 2015	Aug. 31, 2014	Oct. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
	bbl	bbl
Loss Contingencies [Line Items]
Aggregate reserves for all claims				$0.60	$0.60
Crude Oil Spilled or Leaked	300	200
Environmental accruals				5.2	5.3
Tallgrass Interstate Gas Transmission, LLC (TIGT) [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			$2

Reporting_Segments_Additional_

Reporting Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
	Segment
Segment Reporting [Abstract]
Number of reportable segments	3

Reporting_Segments_Summary_of_

Reporting Segments - Summary of TEP's Segment Information of Revenue (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$114,675	$94,779
TEP
Segment Reporting Information [Line Items]
Revenues	114,675	94,779
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	32,264	38,376
TEP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	50,381	0
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	32,030	56,403
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Operating Segments
Segment Reporting Information [Line Items]
Revenues	116,021	96,034
TEP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	33,610	39,631
TEP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	50,381	0
TEP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	32,030	56,403
TEP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment
Segment Reporting Information [Line Items]
Revenues	-1,346	-1,255
TEP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	-1,346	-1,255
TEP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Revenues	0	0
TEP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$0	$0

Reporting_Segments_Summary_of_1

Reporting Segments - Summary of TEP's Segment Information of Earnings (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reconciliation to Net Income:
Interest expense (income), net	$3,440	$1,296
Depreciation and amortization expense	20,605	8,309
Noncash compensation expense	1,527	941
Equity in earnings of unconsolidated investment	0	-444
Net income (loss)	32,319	17,124
TEP
Reconciliation to Net Income:
Net income (loss)	32,319	17,124
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	17,900	18,607
TEP | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	26,852	0
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	8,718	9,596
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	-635	-625
TEP | Operating Segments | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	19,246	19,862
TEP | Operating Segments | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	25,506	0
TEP | Operating Segments | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	8,718	9,596
TEP | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	-635	-625
TEP | Inter-Segment | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	-1,346	-1,255
TEP | Inter-Segment | Crude Oil Transportation & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,346	0
TEP | Inter-Segment | Processing & Logistics
Segment Reporting Information [Line Items]
Adjusted EBITDA	0	0
TEP | Inter-Segment | Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	0	0
TEP | Segment Reconciling Items
Reconciliation to Net Income:
Interest expense (income), net	3,440	1,294
Depreciation and amortization expense	20,533	7,804
Gain (Loss) on Sale of Assets and Asset Impairment Charges	-4,483	0
Non-cash (gain) loss related to derivative instruments	-90	351
Noncash compensation expense	1,527	941
Distributions from unconsolidated investment	0	508
Equity in earnings of unconsolidated investment	0	-444
Non-cash loss allocated to noncontrolling interest	($9,377)	$0

Reporting_Segments_Summary_of_2

Reporting Segments - Summary of TEP's Segment Information of Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Segment assets	$2,453,551		$2,457,197
Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Segment assets	719,510		716,106
Crude Oil Transportation and Logistics
Segment Reporting Information [Line Items]
Segment assets	1,391,417		1,394,793
Processing & Logistics
Segment Reporting Information [Line Items]
Segment assets	337,303		340,620
Corporate and Other
Segment Reporting Information [Line Items]
Segment assets	5,321		5,678
TEP
Segment Reporting Information [Line Items]
Capital expenditures	13,300	209,111
TEP | Natural Gas Transportation & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	3,865	9,626
TEP | Crude Oil Transportation and Logistics
Segment Reporting Information [Line Items]
Capital expenditures	6,480	196,437
TEP | Processing & Logistics
Segment Reporting Information [Line Items]
Capital expenditures	2,955	3,048
TEP | Corporate and Other
Segment Reporting Information [Line Items]
Capital expenditures	$0	$0

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events (Details) (USD $)	0 Months Ended
	Mar. 30, 2015	Feb. 27, 2015	12-May-15
Subsequent Event [Line Items]
Initial public offering of common units (in units)	1,200,000	10,000,000
Unit price ($ per share)		$50.82
Scenario, Forecast | Limited Partner | TEGP | Subsequent Event
Subsequent Event [Line Items]
Unitholders units outstanding (in units)			20,000,000
Scenario, Forecast | Limited Partner | Capital Unit, Class A | TEGP | Subsequent Event
Subsequent Event [Line Items]
Initial public offering of common units (in units)			41,500,000
Unit price ($ per share)			$29
Over-Allotment Option | Scenario, Forecast | Limited Partner | Capital Unit, Class A | TEGP | Subsequent Event
Subsequent Event [Line Items]
Initial public offering of common units (in units)			6,225,000