Qep Midstream Partners (QEPM) 10-K 20 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Aug. 14, 2013	Feb. 28, 2014	Feb. 28, 2014	Feb. 28, 2014
			Common Stock Units [Member]	General Partner Units [Member]	Limited Partners Subordinated Units [Member]
Entity Information [Line Items]	'	'	'	'	'
Entity Registrant Name	'QEP MIDSTREAM PARTNERS, LP	'	'	'	'
Entity Central Index Key	'0001576044	'	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'	'
Entity Well-known Seasoned Issuer	'No	'	'	'	'
Entity Voluntary Filers	'No	'	'	'	'
Entity Current Reporting Status	'Yes	'	'	'	'
Entity Filer Category	'Non-accelerated Filer	'	'	'	'
Entity Common Stock, Shares Outstanding	'	'	26,710,748	1,090,117	26,705,000
Document Fiscal Year Focus	'2013	'	'	'	'
Document Fiscal Period Focus	'FY	'	'	'	'
Document Type	'10-K	'	'	'	'
Amendment Flag	'false	'	'	'	'
Document Period End Date	31-Dec-13	'	'	'	'
Entity Public Float	'	$0	'	'	'

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	5 Months Ended	7 Months Ended	12 Months Ended		5 Months Ended
Share data in Millions, unless otherwise specified	Dec. 31, 2013	Aug. 13, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013
	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Limited Partners Common Units [Member]	Limited Partners Subordinated Units [Member]
Gathering and transportation	$46,100,000	$92,900,000	$151,300,000	$140,400,000	'	'
Condensate sales	2,000,000	7,400,000	10,900,000	15,500,000	'	'
Total revenues	48,100,000	100,300,000	162,200,000	155,900,000	'	'
Gathering	9,800,000	19,700,000	29,900,000	27,700,000	'	'
General and administrative	5,500,000	13,600,000	17,000,000	15,300,000	'	'
Taxes other than income taxes	800,000	1,300,000	3,100,000	2,800,000	'	'
Depreciation and amortization	11,700,000	25,000,000	39,800,000	38,300,000	'	'
Total operating expenses	27,800,000	59,600,000	89,800,000	84,100,000	'	'
Net loss from property sales	0	-500,000	0	0	'	'
Operating income	20,300,000	40,200,000	72,400,000	71,800,000	'	'
Other income	0	0	100,000	100,000	'	'
Income from unconsolidated affiliates	1,200,000	3,800,000	7,200,000	4,400,000	'	'
Interest expense	-900,000	-2,600,000	-8,700,000	-12,800,000	'	'
Net income	20,600,000	41,400,000	71,000,000	63,500,000	'	'
Net income attributable to noncontrolling interest	-1,500,000	-2,500,000	-3,700,000	-3,200,000	'	'
Net income attributable to Predecessor	19,100,000	38,900,000	67,300,000	60,300,000	9,300,000	9,300,000
Net income attributable to QEP Midstream per limited partner unit (basic and diluted)	'	'	'	'	$0.35	$0.35
Weighted Average Limited Partnership Units Outstanding, Basic	'	'	'	'	26.7	26.7

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	Successor [Member]	Predecessor [Member]	Limited Partners Common Units [Member]	Limited Partners Subordinated Units [Member]	Common Stock Units [Member]	Limited Partners Subordinated Units [Member]
					Successor [Member]	Successor [Member]
Cash and cash equivalents	$19	$1.40	'	'	'	'
Accounts receivable, net	9.1	18.2	'	'	'	'
Accounts receivable from related party	25.5	24.9	'	'	'	'
Natural gas imbalance receivable	1.7	2.2	'	'	'	'
Other current assets	0	0.1	'	'	'	'
Total current assets	55.3	46.8	'	'	'	'
Property, plant and equipment, net	493.4	634.1	'	'	'	'
Investment in unconsolidated affiliates	27.8	40.7	'	'	'	'
Other Assets, Noncurrent	3.4	3.8	'	'	'	'
Total assets	579.9	725.4	'	'	'	'
Accounts payable	6.6	6.3	'	'	'	'
Accounts payable to related party	9	3.7	'	'	'	'
Natural gas imbalance liability	1.7	2.2	'	'	'	'
Deferred revenue	9.6	0.3	'	'	'	'
Accrued compensation	0	1.7	'	'	'	'
Other current liabilities	0.2	1.3	'	'	'	'
Total current liabilities	27.1	15.5	'	'	'	'
Long-term debt to related party	0	131.1	'	'	'	'
Asset retirement obligation	13.3	16.3	'	'	'	'
Deferred revenue	11.9	10.2	'	'	'	'
Total long-term liabilities	25.2	157.6	'	'	'	'
Commitments and contingencies (see Note 9)	'	'	'	'	'	'
Limited Partners' Capital Account	'	'	0	0	411.7	68
General Partners' Capital Account	2.5	0	'	'	'	'
Partners' Capital	482.2	0	'	'	'	'
Parent net investment	0	504.6	'	'	'	'
Noncontrolling interest	45.4	47.7	'	'	'	'
Total net equity	527.6	552.3	'	'	'	'
Total liabilities and equity	$579.90	$725.40	'	'	'	'

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
	General Partner Units [Member]	General Partner Units [Member]	Limited Partners Subordinated Units [Member]	Limited Partners Subordinated Units [Member]	Limited Partners Common Units [Member]	Limited Partners Common Units [Member]
	Successor [Member]	Predecessor [Member]	Successor [Member]	Predecessor [Member]	Successor [Member]	Predecessor [Member]
Partners' Capital Account, Units	1,100,000	0	26,700,000	0	26,700,000	0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	5 Months Ended	7 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Aug. 13, 2013	Dec. 31, 2012	Dec. 31, 2011
	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Net income	$20.60	$41.40	$71	$63.50
Depreciation and amortization	11.7	25	39.8	38.3
Equity-based compensation expense	0.4	0	0	0
Income from unconsolidated affiliates	-1.2	-3.8	-7.2	-4.4
Distributions from unconsolidated affiliates	1.3	4.9	7.8	7.7
Amortization of debt issuance costs	0.2	0	0	0
Net loss from asset sales	0	0.5	0	0
Accounts receivable	-8.3	17.8	-2.4	-8.4
Accounts payable and accrued expenses	0.3	8.9	-1.6	0.9
Other	6.6	-3.8	-0.4	-0.1
Net cash provided by operating activities	31.6	90.9	107	97.5
Property, plant and equipment	-14.2	-9.1	-43.7	-28.6
Proceeds from sale of assets	0.5	0.6	0.3	0.1
Net cash used in investing activities	-13.7	-8.5	-43.4	-28.5
Repayments of long-term debt to related party	-95.5	-66.4	-43.6	-63.6
Long-term debt issuance costs	-3.3	0	0	0
Net proceeds from initial public offering	449.6	0	0	0
Proceeds from initial public offering distributed to parent	-351.1	0	0	0
Contributions from (distributions to) parent, net	9.6	-12.2	-14.5	1
Unitholder Distribution	-7.1	0	0	0
Distribution to noncontrolling interest	-2.2	-4.1	-6.6	-5.4
Net cash used in financing activities	0	-82.7	-64.7	-68
Change in cash and cash equivalents	17.9	-0.3	-1.1	1
Beginning cash and cash equivalents	1.1	1.4	2.5	1.5
Ending cash and cash equivalents	19	1.1	1.4	2.5
Change in capital expenditure accrual balance	$4.30	($1.60)	($1.30)	($1.50)

Consolidated_Statement_of_Equi

Consolidated Statement of Equity - Successor Statement (USD $)	Total	Noncontrolling Interest [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]
In Millions, except Share data, unless otherwise specified	USD ($)		USD ($)	General Partner Units [Member]	Noncontrolling Interest [Member]	Limited Partners Common Units - QEP [Member]	Limited Partners Common Units - Public [Member]	Limited Partners Common Units [Member]	Limited Partners Subordinated Units [Member]
				USD ($)	USD ($)			USD ($)	USD ($)
Balance at April 19, 2013 (inception - prior to initial public offering) at Aug. 11, 2013	'	'	'	'	'	'	'	'	'
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	'	'	'	$0	'	'	'	'	$0
Partners' Capital Account, Units	54,505,865	'	'	1,100,000	'	'	'	26,700,000	26,700,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'
Contribution of net assets, units	'	'	'	1,100,000	'	3,700,000	'	'	26,700,000
Contribution of net assets - Equity	'	'	407.8	2.2	46.1	'	'	72.2	287.3
Net Proceeds from Initial Public Offering	'	'	'	'	'	'	23,000,000	'	'
Net Proceeds from Initial Public Offering	'	'	449.6	0	0	'	'	449.6	0
Proceeds from initial public offering distributed to parent	'	'	-351.1	0	0	'	'	-117.5	-233.6
Contributions from Parent	'	'	9.6	0	0	'	'	1.1	8.5
Distributions to noncontrolling interest	0	'	-2.2	'	-2.2	'	'	'	'
Distributions to unitholders	'	'	-7.1	-0.1	0	'	'	-3.5	-3.5
Equity-based compensation	'	'	0.4	0	0	'	'	0.4	0
Other	'	'	0	-0.1	0	'	'	0.1	0
Net income	'	'	20.6	0.5	1.5	'	'	9.3	9.3
Balance at Dec. 31, 2013	'	'	527.6	2.5	45.4	'	'	411.7	68
Balance at April 19, 2013 (inception - prior to initial public offering) at Aug. 14, 2013	'	'	0	0	0	'	'	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'
Proceeds from initial public offering distributed to parent	'	'	351.1	'	'	'	'	'	'
Contributions from Parent	'	'	9.6	'	'	'	'	'	'
Net income	'	'	20.6	'	'	'	'	'	'
Balance at Dec. 31, 2013	'	'	$527.60	'	'	'	'	'	'

Consolidated_Statement_of_Equi1

Consolidated Statement of Equity - Predecessor (USD $)	Total	Parent [Member]	Noncontrolling Interest [Member]
In Millions, unless otherwise specified
Total Net Equity, Balance at Dec. 31, 2010	$443.30	'	'
Noncontrolling Interest, Balance at Dec. 31, 2010	'	'	52.8
Parent Net Investment, Balance at Dec. 31, 2010	'	390.5	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Net income attributable to Predecessor	'	60.3	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	3.2
Net income	63.5	'	'
Contributions from (distributions to) parent, net	1	1	0
Distribution of noncontrolling interest	-5.4	0	-5.4
Total Net Equity, Balance at Dec. 31, 2011	502.4	'	'
Noncontrolling Interest, Balance at Dec. 31, 2011	'	'	50.6
Parent Net Investment, Balance at Dec. 31, 2011	'	451.8	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Net income attributable to Predecessor	'	67.3	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	3.7
Net income	71	'	'
Contributions from (distributions to) parent, net	-14.5	-14.5	0
Distribution of noncontrolling interest	-6.6	0	-6.6
Total Net Equity, Balance at Dec. 31, 2012	552.3	'	'
Noncontrolling Interest, Balance at Dec. 31, 2012	'	'	47.7
Parent Net Investment, Balance at Dec. 31, 2012	'	504.6	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'
Net income attributable to Predecessor	'	38.9	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	2.5
Net income	41.4	'	'
Contributions from (distributions to) parent, net	-12.2	-12.2	0
Distribution of noncontrolling interest	-4.1	0	-4.1
Total Net Equity, Balance at Aug. 13, 2013	577.4	'	'
Noncontrolling Interest, Balance at Aug. 13, 2013	'	'	46.1
Parent Net Investment, Balance at Aug. 13, 2013	'	$531.30	'

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2013
Description of Business and Basis of Presentation [Abstract]	'
Business Description and Basis of Presentation [Text Block]	'
	Description of Business and Basis of Presentation
	Description of Business
	QEP Midstream Partners, LP (the Partnership) was formed in Delaware on April 19, 2013, to own, operate, acquire and develop midstream energy assets. The Partnership's assets consist of ownership interests in four gathering systems and two FERC regulated pipelines through which we provide natural gas and crude oil gathering and transportation services in Colorado, North Dakota, Utah and Wyoming.
	On August 14, 2013, the Partnership completed its initial public offering (the IPO) of 20,000,000 common units representing limited partner interests in the Partnership. In addition, as of September 4, 2013, the underwriters had exercised their option to purchase an additional 3,000,000 common units (refer to Note 3 - Initial Public Offering). Unless the context otherwise requires, references in this report to "Predecessor," "we," "our," "us," or like terms, when used on a historical basis (periods prior to the IPO on August 14, 2013), refer to QEP Midstream Partners, LP Predecessor (the Predecessor). References in this report to "QEP Midstream," the "Partnership," "Successor," "we," "our," "us," or like terms, when used from and after August 14, 2013, in the present tense or prospectively, refer to QEP Midstream Partners, LP and its subsidiaries. For purposes of these financial statements, "QEP" refers to QEP Resources, Inc. and its consolidated subsidiaries, including the Partnership.
	As part of the IPO, QEP Midstream Partners GP, LLC (the General Partner) and QEP Field Services Company (QEP Field Services), both QEP affiliates, collectively contributed to the Partnership (i) a 100% ownership interest in each of QEP Midstream Partners Operating, LLC (the Operating Company), QEPM Gathering I, LLC and Rendezvous Pipeline Company, L.L.C. (Rendezvous Pipeline), (ii) a 78% interest in Rendezvous Gas Services, L.L.C. (Rendezvous Gas Services), and (iii) a 50% equity interest in Three Rivers Gathering, L.L.C. (Three Rivers Gathering). The General Partner serves as general partner of the Partnership and together with QEP provides services to the Partnership pursuant to an Omnibus Agreement between the parties.
	The Predecessor consists of all of the Partnership's gathering assets as well as a 38% equity interest in Uintah Basin Field Services, L.L.C. (Uintah Basin Field Services) and a 100% interest in all other gathering assets owned by QEP Field Services in the Uinta Basin (collectively referred to as the Uinta Basin Gathering System). The Uinta Basin Gathering System was retained by QEP Field Services and was not part of the assets conveyed to the Partnership.
	Basis of Presentation
	The consolidated financial statements were prepared in accordance with GAAP and with the instructions for annual reports on Form 10-K and Regulations S-X and S-K. All significant intercompany accounts and transactions have been eliminated in consolidation.
	The consolidated financial statements and accompanying notes prior to the IPO (August 14, 2013) relate to the Predecessor and have been prepared in accordance with GAAP on the basis of QEP's historical ownership of the Predecessor assets. The Predecessor's consolidated financial statements have been prepared from the separate records maintained by QEP and may not necessarily be indicative of the actual results of operations that might have occurred if the Predecessor had been operated separately during the periods reported. Because a direct ownership relationship did not exist among the businesses comprising the Predecessor, the net investment in the Predecessor is shown as parent net investment, in lieu of owner's equity, in the audited consolidated financial statements. Further, management does not believe that these financial statements are necessarily comparable to the financial statements reported by the Partnership for periods subsequent to the IPO nor reflective of other transactions that resulted in the capitalization and start-up of the Partnership. Refer to Item 7 of Part II of this Annual Report on Form 10-K for a description of the significant factors affecting the comparability of the Predecessor's historical results of operations and those of the Partnership subsequent to the IPO.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	Note 2 - Summary of Significant Accounting Policies
	Revenue Recognition
	QEP Midstream provides natural gas gathering and transportation services, primarily under fee-based contracts. Under these arrangements, we receive a fee or fees for one or more of the following services: firm and interruptible gathering or transmission of natural gas, crude oil, condensate, and water. The revenue we earn from these arrangements is generally directly related to the volume of natural gas, crude oil, or water that flows through the our systems and is not directly dependent on commodity prices. Revenue for these agreements is recognized at the time the service is performed. In certain of these contracts, the agreement provides for minimum annual payments or fixed demand charges which are recognized as revenue pursuant to the contract terms. In addition, under certain of these gathering agreements, we retain and sell condensate, which falls out of the natural gas stream during the gathering process. We recognize revenue from condensate sales upon transfer of title. The Partnership has deferred revenue of which a portion will be recognized as revenue pursuant to contractual terms with the remaining being recognized based on the outcome of certain litigation. Refer to Note 9 - Commitments and Contingencies.
	Investment in Unconsolidated Affiliates
	QEP Midstream uses the equity method to account for investment in unconsolidated affiliates. The investment in unconsolidated affiliates on the Unaudited Consolidated Balance Sheets equals our proportionate share of equity reported by the unconsolidated affiliates. The investment is assessed for possible impairment when events indicate that the fair value of the investment may be below the carrying value. When such a condition is deemed to be other than temporary, the carrying value of the investment is written down to its fair value, and the amount of the write-down is included in the determination of net income.
	The unconsolidated affiliate of the Partnership and the ownership percentage as of December 31, 2013, was Three Rivers Gathering (50%). The unconsolidated affiliates of the Predecessor and the ownership percentages as of August 13, 2013, and December 31, 2012, were Uintah Basin Field Services (38%) and Three Rivers Gathering (50%), both of which are engaged in the gathering, transportation and compression of natural gas.
	Noncontrolling Interests
	QEP Midstream has a 78% interest in Rendezvous Gas Services, a joint venture with Western Gas, which owns a gas gathering system located in Wyoming. Rendezvous Gas Services is consolidated under the voting interest model and Western Gas' non-controlling interest is presented on the Consolidated Statements of Income and Consolidated Balance Sheets accordingly.
	Use of Estimates
	The preparation of the consolidated financial statements and notes in conformity with GAAP requires that management formulate estimates and assumptions that affect revenues, expenses, assets, liabilities and the disclosure of contingent assets and liabilities. Items subject to estimates and assumptions include the carrying amount of property, plant and equipment, valuation allowances for receivables, valuation of accrued liabilities and accrued revenue, among others. Although management believes these estimates are reasonable, actual results could differ from these estimates.
	Cash and Cash Equivalents
	Historically, the majority of the Predecessor’s operations were funded by QEP and managed under QEP’s centralized cash management program. Following the IPO, we maintain our own bank accounts and sources of liquidity and continue to utilize QEP's cash management expertise. Cash equivalents consist principally of repurchase agreements with maturities of three months or less. The repurchase agreements are highly liquid investments in overnight securities made through commercial-bank accounts that result in available funds the next business day.
	Accounts Receivable Trade
	QEP Midstream’s receivables consist of third party and QEP invoices. We routinely assess the recoverability of all material trade and other receivables to determine their collectability. The Partnership had no allowance for bad-debt expense at December 31, 2013. As of December 31, 2013, the Partnership had $8.5 million in accounts receivable related to outstanding litigation. Refer to Note 9 - Commitments and Contingencies for additional information. The Predecessor’s allowance for bad-debt expense was $0.4 million and $0.3 million at December 31, 2012 and 2011, respectively.
	Property, Plant and Equipment
	Property, plant and equipment primarily consists of natural gas and oil gathering pipelines, transmission pipelines and compressors and are stated at the lower of historical cost, less accumulated depreciation or fair value, if impaired. QEP Midstream capitalizes construction-related direct labor and material costs. Maintenance and repair costs are expensed as incurred, except substantial compression overhaul costs that are capitalized and depreciated. Depreciation of gathering equipment is charged to expense using the straight-line method.
	Impairment of Long-Lived Assets
	QEP Midstream evaluates whether long-lived assets have been impaired and determines if the carrying amount of its assets may not be recoverable. Impairment is indicated when a triggering event occurs and/or the sum of the estimated undiscounted future net cash flows of an evaluated asset is less than the asset’s carrying value. If impairment is indicated, fair value is calculated using a discounted cash flow approach. Cash flow estimates require forecasts and assumptions for many years into the future for a variety of factors, including significant changes in market conditions resulting from events such as changes in commodity prices or the condition of an asset or a change in management’s intent to utilize the asset. There were no long-lived asset impairments recognized during 2013, 2012 or 2011.
	Asset Retirement Obligations
	Asset retirement obligations (ARO) associated with the retirement of tangible long-lived assets are recognized as liabilities with an increase to the carrying amounts of the related long-lived assets in the period incurred. The cost of the tangible asset, including the asset retirement costs, is depreciated over the useful life of the asset. ARO are recorded at estimated fair value, measured by reference to the expected future cash outflows required to satisfy the retirement obligations discounted at QEP Midstream's credit-adjusted, risk-free interest rate. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value. If estimated future costs of ARO change, an adjustment is recorded to both the asset retirement obligation and the long-lived asset. Revisions to estimated ARO can result from changes in retirement cost estimates, revisions to estimated inflation rates and changes in the estimated timing of abandonment.
	Natural Gas Imbalances
	Natural gas imbalance receivables or payables result from differences in gas volumes received and gas volumes delivered to customers. Natural gas volumes owed to or by QEP Midstream that are subject to tariffs are valued at market index prices, as of the balance sheet dates, and are subject to cash settlement procedures. Other natural gas volumes owed to or by QEP Midstream are valued at our weighted average cost of natural gas as of the balance sheet dates and are settled in-kind.
	Litigation and Other Contingencies
	In accordance with Accounting Standards Codification (ASC) 450, Contingencies, an accrual is recorded for a loss contingency when its occurrence is probable and damages can be reasonably estimated based on the anticipated most likely outcome or the minimum amount within a range of possible outcomes. We regularly reviews contingencies to determine the adequacy of our accruals and related disclosures. The amount of ultimate loss may differ from these estimates. Refer to Note 9 - Commitments and Contingencies.
	We accrue losses associated with environmental obligations when such losses are probable and can be reasonably estimated. Accruals for estimated environmental losses are recognized no later than at the time the remediation feasibility study, or the evaluation of response options, is complete. These accruals are adjusted as additional information becomes available or as circumstances change. Future environmental expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded separately as assets at their undiscounted value when receipt of such recoveries is probable.
	Credit Risk
	Exposure to credit risk may be affected by the concentration of customers due to changes in economic or other conditions. Customers may include individuals and commercial and industrial enterprises that may react differently to changing conditions. Management believes that its credit-review procedures, loss reserves, customer deposits and collection procedures have adequately provided for usual and customary credit-related losses.
	The customers accounting for 10% or more of QEP Midstream's revenues for the period subsequent to the IPO on August 14, 2013 include:
		Period From August 14, 2013, through December 31, 2013
	QEP (revenue from affiliate)	$	32.8
	Questar Gas Company	7.5
	Fair Value Measurements
	QEP Midstream did not have any assets accounted for at fair value as of December 31, 2013. The Predecessor did not have any assets accounted for at fair value as of December 31, 2012 or 2011. We believe the carrying values of our current assets and liabilities approximate fair value. The carrying amount of our affiliated long-term debt approximates fair value.
	The initial measurement of asset retirement obligations at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant and equipment. Significant Level 3 inputs are used in the calculation of asset retirement obligations include retirement costs and asset lives. Refer to Note 6 for a reconciliation of the Partnership’s asset retirement obligations.
	Post-Retirement Employee Benefit Plans
	QEP has various employee benefit plans, which include a qualified defined benefit pension plan, a nonqualified, unfunded, defined pension plan, post-retiree medical plans, and an employee investment plan. For purposes of these financial statements, QEP Midstream is considered to be participating in the employee benefit plans of QEP; however, employees who support QEP Midstream remain employees of QEP. As a participant in the benefit plans, QEP Midstream recognizes as expense the allocation from QEP, if any, which is included in the general and administrative fee for the Post-IPO Period or general and administrative fee allocation from QEP prior to the IPO. However, QEP Midstream does not recognize any employee benefit plan liabilities.
	Equity-Based Compensation
	The Predecessor’s financial statements reflect various share-based compensation awards by QEP. These awards include stock options, restricted shares and performance share units. For purposes of these combined financial statements, the Predecessor recognized as expense in each period the required allocation from QEP, with the offset included in net parent equity.
	In connection with the IPO, the Board adopted the QEP Midstream Partners, LP 2013 Long-Term Incentive Plan (the LTIP) for officers, directors and employees of the General Partner and its affiliates, and any consultants, affiliates of the General Partner or other individuals who perform services for the Partnership. The LTIP provides for the grant, at the discretion of the Board, of unit awards, restricted units, phantom units, unit options, unit appreciation rights, distribution equivalent rights, profits interest units and other equity-based awards. Refer to Note 8 for additional information on the Partnerships LTIP.
	Income Taxes
	QEP Midstream's financial statements do not include income tax allocation as the Partnership is treated as a partnership for federal and state income tax purposes, with each partner being separately taxed on its share of the taxable income. The allocation of taxable income to our individual partners may vary substantially from net income reported in our consolidated statements of income.
	Recent Accounting Developments
	In December of 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-11, Disclosures about Offsetting Assets and Liabilities, which enhances disclosure requirements regarding an entity's financial instruments and derivative instruments that are offset or subject to a master netting arrangement. This information about offsetting and related netting arrangements will enable users of financial statements to understand the effect of those arrangements on the entity's financial position, including the effect of rights of setoff. The amendments were required for annual reporting periods beginning after January 1, 2013, and interim periods within those annual periods. The adoption of this ASU did not have a material effect on our disclosure requirements.

Initial_Public_Offering

Initial Public Offering	12 Months Ended
	Dec. 31, 2013
Initial Public Offering [Abstract]	'
Initial Public Offering [Text Block]	'
	Note 3 - Initial Public Offering
	On August 14, 2013, the Partnership completed its IPO selling 20,000,000 common units, representing limited partner interests in the Partnership, at a price to the public of $21.00 per common unit. The Partnership received net proceeds of $390.7 million from the sale of the common units, after deducting underwriting discounts and commissions, structuring fees and offering expenses of $29.3 million. Following the IPO, the underwriters exercised their over-allotment option to purchase an additional 3,000,000 common units, at a price of $21.00 per common unit, providing additional net proceeds of $58.9 million, after deducting $4.1 million of underwriters' discounts and commissions and structuring fees, to the Partnership.
	The Partnership used the net proceeds to repay its outstanding debt balance with QEP, which was assumed with the assets contributed to the Partnership, pay revolving credit facility origination fees and make a cash distribution to QEP, a portion of which was used to reimburse QEP for certain capital expenditures it incurred with respect to assets contributed to the Partnership.
	The following is a reconciliation of proceeds from the IPO (in millions):
	Total proceeds from the IPO		$	483
	Offering costs		(33.4		)
	Net proceeds from the IPO		449.6
	Revolving credit facility origination fees		(3.0		)
	Repayment of outstanding debt with QEP		(95.5		)
	Net proceeds distributed to QEP from the IPO		$	351.1
	As of December 31, 2013, the Partnership's ownership consisted of the following:
			Units			% Ownership
	Limited partner common units - QEP		3,701,750			6.8	%
	Limited partner common units - public		23,008,998			42.2	%
	Limited partner subordinated units - QEP		26,705,000			49	%
	General partner units		1,090,117			2	%
	Total QEP Midstream units		54,505,865
	Contribution, Conveyance and Assumption Agreement and Concurrent Transactions
	On August 14, 2013, in connection with the closing of the IPO, the Partnership entered into a Contribution, Conveyance and Assumption Agreement (the Contribution Agreement) with QEP Field Services, the General Partner and the Operating Company. Immediately prior to the closing of the IPO, the following transactions, among others, occurred pursuant to the Contribution Agreement:
	•	QEP Field Services contributed to the General Partner, as a capital contribution, a limited liability company interest in the Operating Company with a value equal to 2% of the equity value of the Partnership at the closing of the IPO;
	•	the General Partner contributed to the Partnership, as a capital contribution, the limited liability company interest in the Operating Company in exchange for (a) 1,090,000 general partner units representing the continuation of an aggregate 2% general partner interest in the Partnership and (b) all the incentive distribution rights of the Partnership;
	•	QEP Field Services contributed to the Partnership, as a capital contribution, its remaining limited liability company interests in the Operating Company in exchange for (a) 6,701,750 common units representing a 12.3% limited partner interest in the Partnership, (b) 26,705,000 subordinated units representing a 49% limited partner interest in the Partnership and (c) the right to receive a distribution from the Partnership; and
	•	the public, through the underwriters, contributed $420.0 million in cash (or $390.7 million, net of the underwriters' discounts and commissions, structuring fees and offering expenses of approximately $29.3 million) to the Partnership in exchange for the issuance of 20,000,000 common units.
	Subsequent to the IPO, the underwriters exercised their over-allotment option to purchase an additional 3,000,000 common units in the Partnership, which reduced QEP Field Services' common unit interest in the Partnership from 12.3% to 6.8%.
	The contribution of QEP Field Services' and the General Partner's limited liability company interest in the Operating Company to the Partnership was valued using the carryover book value of the Operating Company, as the transaction is a transfer of assets between entities under common control, as follows (in millions):
	Cash and cash equivalents		$	1.1
	Accounts receivable, net		26.4
	Property, plant and equipment, net		485.6
	Investment in unconsolidated affiliate		27.9
	Account payable and accrued expenses		(21.1		)
	Long-term debt to related party		(95.5		)
	Asset Retirement Obligation		(11.8		)
	Other liabilities		(4.8		)
	Net assets		$	407.8
	First Amended and Restated Agreement of Limited Partnership of QEP Midstream Partners, LP
	On August 14, 2013, in connection with the closing of the IPO, the Agreement of Limited Partnership was amended and restated by the First Amended and Restated Agreement of Limited Partnership of QEP Midstream Partners, LP (as amended and restated, the Partnership Agreement).

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2013
Related Party Transaction [Line Items]	'
Related Party Transactions Disclosure [Text Block]	'
	Related Party Transactions
	The Partnership
	Our General Partner is owned by QEP Field Services, which is a subsidiary of QEP. As of December 31, 2013, QEP Field Services owns 3,701,750 common units and 26,705,000 subordinated units representing a 55.8% limited partner interest in us. In addition, our General Partner owns 1,090,117 general partner units representing a 2.0% general partner interest in us, as well as incentive distribution rights. Transactions with our General Partner, QEP Field Services and QEP are considered to be related party transactions because our General Partner and its affiliates own more than 5% of our equity interests. Following the IPO, in addition to the agreements discussed in Note 3 - Initial Public Offering, the Partnership entered into the following agreements with QEP.
	Omnibus Agreement
	On August 14, 2013, in connection with the closing of the IPO, the Partnership entered into an Omnibus Agreement (the Omnibus Agreement) with QEP Field Services, the General Partner, the Operating Company and QEP, which addresses the following matters:
	•	the Partnership's payment of an annual amount to QEP, initially in the amount of $13.8 million, for the provision of certain general and administrative services by QEP to the Partnership, including a fixed annual fee of approximately $1.4 million for executive management services provided by certain officers of the General Partner, who are also executives of QEP. The remaining portion of this annual amount reflects an estimate of the costs QEP will incur in providing the services;
	•	the Partnership's obligation to reimburse QEP for any out-of-pocket costs and expenses incurred by QEP in providing general and administrative services (which reimbursement is in addition to certain expenses of the General Partner and its affiliates that are reimbursed under the Partnership's Partnership Agreement), as well as any other out-of-pocket expenses incurred by QEP on the Partnership's behalf; and
	•	an indemnity by QEP for certain environmental and other liabilities, and the Partnership's obligation to indemnify QEP and its subsidiaries for events and conditions associated with the operation of the Partnership's assets that occur after the closing of the IPO.
	As long as QEP controls the General Partner, the Omnibus Agreement will remain in full force and effect. If QEP ceases to control the General Partner, either party may terminate the Omnibus Agreement, but the indemnification obligations will remain in full force and effect in accordance with their terms.
	For the period from August 14, 2013, through December 31, 2013, the Partnership was charged $4.6 million under the Omnibus Agreement by QEP.
	Service Agreements
	At the closing of the IPO, the Partnership entered into various midstream agreements with QEP including, but not limited to, natural gas, crude oil, water and condensate gathering and transportation agreements, a fixed price condensate purchase agreement, operating agreements and other service agreements. The Partnership believes that the terms and conditions under these agreements are generally no less favorable to either party than those that could have been negotiated with unaffiliated parties with respect to similar services in the ordinary course of its business. For the period from August 14, 2013, through December 31, 2013, the Partnership generated approximately $32.8 million of its total revenues under agreements with QEP.
	The Predecessor
	Prior to the IPO, the Predecessor had the following agreements in place with QEP resulting in affiliate transactions.
	Centralized Cash Management
	QEP operated a cash management system whereby excess cash from its various subsidiaries, held in separate bank accounts, was consolidated into a centralized account. Sales and purchases related to third-party transactions were settled in cash but were received or paid by QEP within the centralized cash management system.
	Affiliated Debt
	The Predecessor's long-term debt consisted of an allocation from QEP Field Services of its total long-term debt related to QEP Field Services' debt agreements with QEP. During the first quarter of 2012, QEP Field Services had a $250.0 million revolving debt agreement (the 2011 Agreement) with QEP for its working capital requirements, in which QEP Field Services was charged a variable interest rate. Interest during the first quarter of 2012 was allocated to the Predecessor based on an interest rate equal to QEP's average borrowing rate, which was 5.2% in the first quarter of 2012 and historically was paid through non-cash intercompany settlements. In April 2012, QEP Field Services entered into new debt agreements with QEP replacing the 2011 Agreement with a $250.0 million promissory note, which matured at the end of the first quarter of 2013 with a fixed interest rate of 6.05%. The promissory note was renewed on April 1, 2013, with a maturity date of April 1, 2014. In addition, QEP Field Services entered into a $1.0 billion "revolving credit" type promissory note with QEP, which matures on April 1, 2017, to assist with funding of capital expenditures. Accordingly, all amounts have been classified as "Long-term debt to related party" in our Consolidated Balance Sheets. Both agreements require QEP Field Services to pay QEP interest during the last nine months of 2013 at a 6.0% fixed rate. Interest allocated to the Predecessor under these notes in the first quarter of 2013 was based on the fixed-rate due to QEP and $2.8 million was settled in cash. Further, $3.2 million was settled in cash related to intercompany interest expense in 2012. QEP Field Services was in compliance with its covenants under the agreements for all periods prior to the IPO, and there are no letters of credit outstanding. At December 31, 2012, allocated debt for the Predecessor was $131.1 million. In connection with the IPO, $95.5 million of affiliated debt was assumed by the Partnership and was repaid in full on August 14, 2013, with proceeds of the IPO extinguishing all affiliated debt of the Partnership.
	Allocation of Costs
	The employees supporting the Predecessor's operations were employees of QEP. General and administrative expenses allocated to the Predecessor were $13.6 million for the period from January 1, 2013, through August 13, 2013, and $17.0 million for the year ended December 31, 2012, respectively. The consolidated financial statements of the Predecessor include direct charges for operations of our assets and costs allocated by QEP. These costs were reimbursed and related to: (i) various business services, including, but not limited to, payroll, accounts payable and facilities management, (ii) various corporate services, including, but not limited to, legal, accounting, treasury, information technology and human resources and (iii) compensation, equity-based compensation, benefits and pension and post-retirement costs. These expenses were charged or allocated to the Predecessor based on the nature of the expenses and its proportionate share of QEP's gross property, plant and equipment, operating income and direct labor costs. Management believes these allocation methodologies were reasonable.
	The following table summarizes the related party income statement transactions of the Predecessor with QEP:
			Period From January 1, 2013, through August 13, 2013			Year Ended December 31, 2012			Year Ended December 31, 2011
			(in millions)
	Revenues from affiliate		$	55		$	79.7		69.5
	Interest expense to affiliate		(2.6		)	(8.7		)	(12.8	)

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment Disclosure [Text Block]	'
	Property, Plant and Equipment
	A summary of the historical cost of QEP Midstream's property, plant and equipment is as follows:
		Estimated Useful	31-Dec-13			31-Dec-12
		Lives
			Successor			Predecessor
			(in millions)
	Gathering equipment	5 to 40 years	$	737.9		$	907.7
	General support equipment	3 to 30 years	—			11.1
	Total property, plant and equipment		737.9			918.8
	Accumulated depreciation		(244.5		)	(284.7		)
	Total net property, plant and equipment		$	493.4		$	634.1

Asset_Retirement_Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2013
Asset Retirement Obligation [Abstract]	'
Asset Retirement Obligation Disclosure [Text Block]	'
	Asset Retirement Obligations
	The QEP Midstream records asset retirement obligations when there are legal obligations associated with the retirement of tangible long-lived assets. The fair values of such costs are estimated by our personnel based on abandonment costs of similar assets and depreciated over the life of the related assets. Revisions to the ARO liability may occur due, among other things, to changes in estimated abandonment costs and estimated settlement timing. The ARO liability is adjusted to present value each period through an accretion calculation using our credit-adjusted, risk-free interest rate.
	The following is a reconciliation of the changes in the ARO liability for the periods specified below (in millions):
		2013
		Asset Retirement
		Obligations
		Predecessor
	ARO liability at January 1,	$	16.3
	Accretion	0.7
	ARO liability at August 13,(1)	$	17
		Successor
	ARO liability at August 14,	$	11.8
	Accretion	0.3
	Liabilities incurred	0.3
	Revisions	1
	Liabilities Settled	(0.1		)
	ARO liability at December 31,	$	13.3
	(1)	The ending balance of the Predecessor includes the assets that were retained by QEP Field Services and not conveyed to the Partnership in connection with the IPO. See Note 1 - Description of Business and Basis of Presentation, for additional information on the Partnership's assets.

Debt

Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure Text Block [Abstract]	'
Debt Disclosure [Text Block]	'
	Debt
	On August 14, 2013, in connection with the IPO, we entered into a $500.0 million senior secured revolving credit facility (the Credit Facility) with a group of financial institutions. The Credit Facility matures on August 14, 2018, and contains an accordion provision that would allow for the amount of the facility to be increased to $750.0 million with the agreement of the lenders. The Credit Facility is available for working capital, capital expenditures, permitted acquisitions and general corporate purposes, including distributions. Substantially all of the Partnership's assets, excluding equity in and assets of certain joint ventures and unrestricted subsidiaries, are pledged as collateral under the Credit Facility. In addition, the Credit Facility contains restrictions and events of default customary for agreements of this nature.
	Loans under the Credit Facility will bear interest at the Partnership's option at a variable rate per annum equal to either:
	•	a base rate, which will be the highest of (i) the administrative agent's prime rate in effect on such day, (ii) the federal funds rate in effect on such day plus 0.50%, and (iii) one-month LIBOR plus 1.0%, in each case, plus an applicable margin ranging from 0.75% to 1.50% based on the Partnership's consolidated leverage ratio; or
	•	LIBOR plus an applicable margin ranging from 1.75% to 2.50% based on the Partnership's consolidated leverage ratio.
	As of December 31, 2013, there was no debt outstanding under the Credit Facility, and the Partnership was in compliance with the covenants under the credit agreement. For the period from August 14, 2013 to December 31, 2013 the Partnership incurred and paid $0.7 million of commitment fees.
	All debt outstanding prior to and at the IPO relates to intercompany debt with QEP discussed in Note 4 - Related Party Transactions. The net proceeds from the IPO were used to pay off the $95.5 million of debt assumed by the Partnership in connection with the IPO.

EquityBased_Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2013
Phantom Unit Award Activity [Abstract]	'
Unit Compensation [Text Block]	'
	Note 8 - Equity-Based Compensation
	In connection with the IPO, the Board adopted the LTIP for officers, directors and employees of the General Partner and its affiliates, and any consultants, affiliates of the General Partner or other individuals who perform services for the Partnership. The Partnership reserved 5,341,000 common units for issuance pursuant to and in accordance with the LTIP.
	The LTIP provides for the grant, at the discretion of the Board, of unit awards, restricted units, phantom units, unit options, unit appreciation rights, distribution equivalent rights, profits interest units and other equity-based awards. The LTIP limits the number of common units that may be delivered pursuant to awards under the LTIP to 5,341,000 common units. Common units cancelled or forfeited will be available for delivery pursuant to other awards. The LTIP is administered by the Board or a designated committee thereof.
	Common Units
	On August 14, 2013, the Board granted 3,250 common units to the independent director of the Board at $21.00 per unit, which vested immediately. On November 8, 2013, the Board granted a total of 5,748 common units to two additional independent directors of the Board at $22.62 per unit, which vested immediately. The fair value of common unit awards granted to non-employee directors is based on the fair market value of the Partnership's common units on the date of the grant, and the equity-based compensation expense is recognized at the time of grant, since the common unit awards vest immediately and are non-forfeitable.
	Phantom Units
	On August 14, 2013, the Board granted 39,500 phantom units with dividend equivalent rights to employees of the General Partner, including executive officers, which vest in equal installments over a three-year period from the grant date. The fair value of phantom unit awards granted to employees is based on the fair market value of the Partnership's common units on the date of the grant, and the equity-based compensation expense is recognized over the vesting period of three years. The phantom units granted in 2013 are payable in new common unit issuances.
	The following is a summary of the Partnership's phantom unit award activity for the period ended December 31, 2013:
		Phantom Units Outstanding		Weighted-Average Grant-Date Fair Value
	Unvested balance at beginning of the period	—		$	—
	Granted	39,500		22.03
	Vested	—		—
	Forfeited	(1,250	)	22.03
	Unvested balance at December 31, 2013	38,250		$	22.03
	Total compensation expense recognized for the common unit and phantom unit awards since the IPO was $0.4 million, and the total amount of unrecognized compensation cost related to the phantom unit award was $0.7 million as of December 31, 2013, which is expected to be recognized over the remaining vesting period of 2.6 years.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	Commitments and Contingencies
	We are involved in various commercial and regulatory claims, litigation and other legal proceedings that arise in the ordinary course of our business. We assess these claims in an effort to determine the degree of probability and range of possible loss for potential accrual in our consolidated financial statements. In accordance with ASC 450, Contingencies, an accrual is recorded for a loss contingency when its occurrence is probable and damages can be reasonably estimated based on the anticipated most likely outcome or the minimum amount within a range of possible outcomes. Because legal proceedings are inherently unpredictable and unfavorable resolutions could occur, assessing contingencies is highly subjective and requires judgments about uncertain future events. When evaluating contingencies, we may be unable to provide a meaningful estimate due to a number of factors, including the procedural status of the matter in question, the presence of complex or novel legal theories, and/or the ongoing discovery and development of information important to the matter. The Partnership's litigation loss contingencies are discussed below. We are unable to estimate reasonably possible losses in excess of recorded accruals for these contingencies for the reasons set forth above. We believe, however, that the resolution of pending proceedings will not have a material effect on our financial position, results of operations or cash flows.
	Litigation
	At the closing of the IPO, the assets and agreement subject to the ongoing litigation between QGC and QEP Field Services, styled Questar Gas Company v. QEP Field Services Company, Civil No. 120902969, Third Judicial District Court, State of Utah, were assigned to the Partnership. QEP Field Services' former affiliate, QGC, filed this complaint in state court in Utah on May 1, 2012, asserting claims for breach of contract, breach of implied covenant of good faith and fair dealing, an accounting and declaratory judgment related to a 1993 gathering agreement and a 1998 amendment (the 1993 Agreement) executed when the parties were affiliates. Under the 1993 Agreement, certain of our systems provide gathering services to QGC charging an annual gathering rate which is based on cost of service. QGC is disputing the calculation of the gathering rate. The annual gathering rate has been calculated in the same manner under the 1993 Agreement since it was amended in 1998, without any prior objection or challenge by QGC. QGC was netting the disputed amount from its monthly payment of the gathering fees to QEP Field Services and has continued to net such amount from its monthly payment to the Partnership. As of December 31, 2013, the Partnership has deferred revenue of $8.5 million related to the QGC disputed amount. Specific monetary damages are not asserted. QEP Field Services has filed counterclaims seeking damages and a declaratory judgment relating to its gathering services under the 1993 Agreement. QGC may seek to amend its complaint to add the Partnership as a defendant in the litigation. The Partnership has been indemnified by QEP for costs, expenses and other losses incurred by the Partnership in connection with the QGC dispute, subject to certain limitations, as set forth in the Omnibus Agreement (defined above in "Note 4 - Related Party Transactions").

Net_Income_Per_Limited_Partner

Net Income Per Limited Partner Unit	12 Months Ended
	Dec. 31, 2013
Net Income Per Limited Partner Unit [Abstract]	'
Earnings Per Share [Text Block]	'
	Net Income Per Limited Partner Unit
	Net income per unit is applicable to the Partnership's limited partner common and subordinated units. Net income per unit is calculated following the two-class method as the Partnership has more than one class of participating securities including common units, subordinated units, general partner units, certain equity-based compensation awards and incentive distribution rights. Net income per unit is calculated by dividing the limited partners' interest in net income attributable to the Partnership, after deducting any General Partner's incentive distributions, by the weighted-average number of outstanding common and subordinated units outstanding.
	Net income per unit is only calculated for the period subsequent to the IPO as no units were outstanding prior to August 14, 2013. As of December 31, 2013, the basic net income per unit and the diluted net income per unit were equal as there were no potentially dilutive units outstanding.
	The following tables set forth distributions in excess of net income attributable to QEP Midstream and the calculation of net income per unit for the period from August 14, 2013, through December 31, 2013 (in millions, except per unit amounts).
	Net income attributable to QEP Midstream		$	19.1
	General partner's distribution declared(1)		(0.5		)
	Limited partners' distribution declared on common units(1)		(10.4		)
	Limited partners' distribution declared on subordinated units(1)		(10.4		)
	Distribution in excess of net income attributable to QEP Midstream		$	(2.2	)
	(1)	On October 23, 2013, the Partnership declared its first quarterly cash distribution totaling $7.1 million, or $0.13 per unit for the third quarter of 2013. On January 23, 2014, the Partnership declared its quarterly cash distribution totaling $14.2 million, or $0.26 per unit, for the fourth quarter of 2013 (refer to Note 12 - Subsequent Events). During the period from August 14, 2013, through December 31, 2013, no distributions related to the General Partner's incentive distribution rights were declared.
			General Partner			Limited Partners' Common Units			Limited Partners' Subordinated Units			Total
			(in million, except per unit amounts)
	Net income attributable to QEP Midstream:
	Distribution declared		$	0.5		$	10.4		$	10.4		$	21.3
	Distributions in excess of net income attributable to QEP Midstream		—			(1.1		)	(1.1		)	(2.2		)
	Net income attributable to QEP Midstream		$	0.5		$	9.3		$	9.3		$	19.1
	Weighted-average limited partner units outstanding:
	Basic and Diluted		1.1			26.7			26.7			54.5
	Net income per limited partner unit attributable to the QEP Midstream
	Basic and Diluted					$	0.35		$	0.35

Quarterly_Financial_Informatio

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information [Text Block]	'
	Quarterly Financial Information (unaudited)
	The following table provides a summary of unaudited quarterly financial information.
		First Quarter		Second Quarter		Period from July 1, 2013 to August 13, 2013		Period from August 14, 2013 to September 30, 2013		Fourth Quarter
		Predecessor		Predecessor		Predecessor		Successor		Successor
	2013	(in millions, except per unit amounts)
	Revenues	$	40.1	$	40.1	$	20.1	$	16.4	$	31.7
	Operating income	15.8		16.6		7.8		7.4		12.9
	Net income	16		17.7		7.7		7.1		13.5
	Net income attributable to QEP Midstream or Predecessor	15.4		16.4		7.1		6.5		12.6
	Net income attributable to QEP Midstream Partners, LP subsequent to initial public offering per limited partner unit:
	Common	—		—		—		$	0.12	$	0.23
	Subordinated	—		—		—		0.12		0.23
	Distributions declared per limited partner common unit	—		—		—		0.13		0.26
		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	2012 - Predecessor	(in millions)
	Revenues	$	41.9	$	39.7	$	40.8	$	39.8
	Operating income	20.5		18.2		17.3		16.4
	Net income	20.6		17.3		18.2		14.9
	Net income attributable to Predecessor	19.8		16.4		17.2		13.9

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	Subsequent Events
	On January 23, 2014, the Partnership declared its quarterly cash distribution totaling $14.2 million, or $0.26 per unit, for the fourth quarter of 2013.This distribution was paid on February 14, 2014, to unitholders of record on the close of business on February 4, 2014. No distributions related to the General Partner's incentive distribution rights were declared.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Revenue Recognition, Policy [Policy Text Block]	'
	Revenue Recognition
	QEP Midstream provides natural gas gathering and transportation services, primarily under fee-based contracts. Under these arrangements, we receive a fee or fees for one or more of the following services: firm and interruptible gathering or transmission of natural gas, crude oil, condensate, and water. The revenue we earn from these arrangements is generally directly related to the volume of natural gas, crude oil, or water that flows through the our systems and is not directly dependent on commodity prices. Revenue for these agreements is recognized at the time the service is performed. In certain of these contracts, the agreement provides for minimum annual payments or fixed demand charges which are recognized as revenue pursuant to the contract terms. In addition, under certain of these gathering agreements, we retain and sell condensate, which falls out of the natural gas stream during the gathering process. We recognize revenue from condensate sales upon transfer of title. The Partnership has deferred revenue of which a portion will be recognized as revenue pursuant to contractual terms with the remaining being recognized based on the outcome of certain litigation. Refer to Note 9 - Commitments and Contingencies.
Investment in Unconsolidated Affiliates, Policy [Policy Text Block]	'
	Investment in Unconsolidated Affiliates
	QEP Midstream uses the equity method to account for investment in unconsolidated affiliates. The investment in unconsolidated affiliates on the Unaudited Consolidated Balance Sheets equals our proportionate share of equity reported by the unconsolidated affiliates. The investment is assessed for possible impairment when events indicate that the fair value of the investment may be below the carrying value. When such a condition is deemed to be other than temporary, the carrying value of the investment is written down to its fair value, and the amount of the write-down is included in the determination of net income.
	The unconsolidated affiliate of the Partnership and the ownership percentage as of December 31, 2013, was Three Rivers Gathering (50%). The unconsolidated affiliates of the Predecessor and the ownership percentages as of August 13, 2013, and December 31, 2012, were Uintah Basin Field Services (38%) and Three Rivers Gathering (50%), both of which are engaged in the gathering, transportation and compression of natural gas.
Noncontrolling Interests, Policy [Policy Text Block]	'
	Noncontrolling Interests
	QEP Midstream has a 78% interest in Rendezvous Gas Services, a joint venture with Western Gas, which owns a gas gathering system located in Wyoming. Rendezvous Gas Services is consolidated under the voting interest model and Western Gas' non-controlling interest is presented on the Consolidated Statements of Income and Consolidated Balance Sheets accordingly.
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates
	The preparation of the consolidated financial statements and notes in conformity with GAAP requires that management formulate estimates and assumptions that affect revenues, expenses, assets, liabilities and the disclosure of contingent assets and liabilities. Items subject to estimates and assumptions include the carrying amount of property, plant and equipment, valuation allowances for receivables, valuation of accrued liabilities and accrued revenue, among others. Although management believes these estimates are reasonable, actual results could differ from these estimates.
Cash and Cash Equivalents, Policy [Policy Text Block]	'
	Cash and Cash Equivalents
	Historically, the majority of the Predecessor’s operations were funded by QEP and managed under QEP’s centralized cash management program. Following the IPO, we maintain our own bank accounts and sources of liquidity and continue to utilize QEP's cash management expertise. Cash equivalents consist principally of repurchase agreements with maturities of three months or less. The repurchase agreements are highly liquid investments in overnight securities made through commercial-bank accounts that result in available funds the next business day.
Accounts Receivable Trade, Policy [Policy Text Block]	'
	Accounts Receivable Trade
	QEP Midstream’s receivables consist of third party and QEP invoices. We routinely assess the recoverability of all material trade and other receivables to determine their collectability. The Partnership had no allowance for bad-debt expense at December 31, 2013. As of December 31, 2013, the Partnership had $8.5 million in accounts receivable related to outstanding litigation. Refer to Note 9 - Commitments and Contingencies for additional information. The Predecessor’s allowance for bad-debt expense was $0.4 million and $0.3 million at December 31, 2012 and 2011, respectively.
Property, Plant and Equipment, Policy [Policy Text Block]	'
	Property, Plant and Equipment
	Property, plant and equipment primarily consists of natural gas and oil gathering pipelines, transmission pipelines and compressors and are stated at the lower of historical cost, less accumulated depreciation or fair value, if impaired. QEP Midstream capitalizes construction-related direct labor and material costs. Maintenance and repair costs are expensed as incurred, except substantial compression overhaul costs that are capitalized and depreciated. Depreciation of gathering equipment is charged to expense using the straight-line method.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	'
	Impairment of Long-Lived Assets
	QEP Midstream evaluates whether long-lived assets have been impaired and determines if the carrying amount of its assets may not be recoverable. Impairment is indicated when a triggering event occurs and/or the sum of the estimated undiscounted future net cash flows of an evaluated asset is less than the asset’s carrying value. If impairment is indicated, fair value is calculated using a discounted cash flow approach. Cash flow estimates require forecasts and assumptions for many years into the future for a variety of factors, including significant changes in market conditions resulting from events such as changes in commodity prices or the condition of an asset or a change in management’s intent to utilize the asset. There were no long-lived asset impairments recognized during 2013, 2012 or 2011.
Asset Retirement Obligations, Policy [Policy Text Block]	'
	Asset Retirement Obligations
	Asset retirement obligations (ARO) associated with the retirement of tangible long-lived assets are recognized as liabilities with an increase to the carrying amounts of the related long-lived assets in the period incurred. The cost of the tangible asset, including the asset retirement costs, is depreciated over the useful life of the asset. ARO are recorded at estimated fair value, measured by reference to the expected future cash outflows required to satisfy the retirement obligations discounted at QEP Midstream's credit-adjusted, risk-free interest rate. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value. If estimated future costs of ARO change, an adjustment is recorded to both the asset retirement obligation and the long-lived asset. Revisions to estimated ARO can result from changes in retirement cost estimates, revisions to estimated inflation rates and changes in the estimated timing of abandonment.
Natural Gas Imbalances, Policy [Policy Text Block]	'
	Natural Gas Imbalances
	Natural gas imbalance receivables or payables result from differences in gas volumes received and gas volumes delivered to customers. Natural gas volumes owed to or by QEP Midstream that are subject to tariffs are valued at market index prices, as of the balance sheet dates, and are subject to cash settlement procedures. Other natural gas volumes owed to or by QEP Midstream are valued at our weighted average cost of natural gas as of the balance sheet dates and are settled in-kind.
Litigation and Other Contingencies, Policy [Policy Text Block]	'
	Litigation and Other Contingencies
	In accordance with Accounting Standards Codification (ASC) 450, Contingencies, an accrual is recorded for a loss contingency when its occurrence is probable and damages can be reasonably estimated based on the anticipated most likely outcome or the minimum amount within a range of possible outcomes. We regularly reviews contingencies to determine the adequacy of our accruals and related disclosures. The amount of ultimate loss may differ from these estimates. Refer to Note 9 - Commitments and Contingencies.
	We accrue losses associated with environmental obligations when such losses are probable and can be reasonably estimated. Accruals for estimated environmental losses are recognized no later than at the time the remediation feasibility study, or the evaluation of response options, is complete. These accruals are adjusted as additional information becomes available or as circumstances change. Future environmental expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded separately as assets at their undiscounted value when receipt of such recoveries is probable.
Credit Risk, Policy [Policy Text Block]	'
	Credit Risk
	Exposure to credit risk may be affected by the concentration of customers due to changes in economic or other conditions. Customers may include individuals and commercial and industrial enterprises that may react differently to changing conditions. Management believes that its credit-review procedures, loss reserves, customer deposits and collection procedures have adequately provided for usual and customary credit-related losses.
	The customers accounting for 10% or more of QEP Midstream's revenues for the period subsequent to the IPO on August 14, 2013 include:
		Period From August 14, 2013, through December 31, 2013
	QEP (revenue from affiliate)	$	32.8
	Questar Gas Company	7.5
Fair Value Measurement, Policy [Policy Text Block]	'
	Fair Value Measurements
	QEP Midstream did not have any assets accounted for at fair value as of December 31, 2013. The Predecessor did not have any assets accounted for at fair value as of December 31, 2012 or 2011. We believe the carrying values of our current assets and liabilities approximate fair value. The carrying amount of our affiliated long-term debt approximates fair value.
	The initial measurement of asset retirement obligations at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant and equipment. Significant Level 3 inputs are used in the calculation of asset retirement obligations include retirement costs and asset lives. Refer to Note 6 for a reconciliation of the Partnership’s asset retirement obligations.
Pension and Other Postretirement Plans, Policy [Policy Text Block]	'
	Post-Retirement Employee Benefit Plans
	QEP has various employee benefit plans, which include a qualified defined benefit pension plan, a nonqualified, unfunded, defined pension plan, post-retiree medical plans, and an employee investment plan. For purposes of these financial statements, QEP Midstream is considered to be participating in the employee benefit plans of QEP; however, employees who support QEP Midstream remain employees of QEP. As a participant in the benefit plans, QEP Midstream recognizes as expense the allocation from QEP, if any, which is included in the general and administrative fee for the Post-IPO Period or general and administrative fee allocation from QEP prior to the IPO. However, QEP Midstream does not recognize any employee benefit plan liabilities.
Equity-based Compensation Policy [Policy Text Block]	'
	Equity-Based Compensation
	The Predecessor’s financial statements reflect various share-based compensation awards by QEP. These awards include stock options, restricted shares and performance share units. For purposes of these combined financial statements, the Predecessor recognized as expense in each period the required allocation from QEP, with the offset included in net parent equity.
	In connection with the IPO, the Board adopted the QEP Midstream Partners, LP 2013 Long-Term Incentive Plan (the LTIP) for officers, directors and employees of the General Partner and its affiliates, and any consultants, affiliates of the General Partner or other individuals who perform services for the Partnership. The LTIP provides for the grant, at the discretion of the Board, of unit awards, restricted units, phantom units, unit options, unit appreciation rights, distribution equivalent rights, profits interest units and other equity-based awards. Refer to Note 8 for additional information on the Partnerships LTIP.
Income Tax, Policy [Policy Text Block]	'
	Income Taxes
	QEP Midstream's financial statements do not include income tax allocation as the Partnership is treated as a partnership for federal and state income tax purposes, with each partner being separately taxed on its share of the taxable income.
Recent Accounting Developments, Policy [Policy Text Block]	'
	Recent Accounting Developments
	In December of 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-11, Disclosures about Offsetting Assets and Liabilities, which enhances disclosure requirements regarding an entity's financial instruments and derivative instruments that are offset or subject to a master netting arrangement. This information about offsetting and related netting arrangements will enable users of financial statements to understand the effect of those arrangements on the entity's financial position, including the effect of rights of setoff. The amendments were required for annual reporting periods beginning after January 1, 2013, and interim periods within those annual periods. The adoption of this ASU did not have a material effect on our disclosure requirements.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	5 Months Ended
	Dec. 31, 2013
Schedule of Revenue by Significant Customer [Line Items]	'
Schedule of Revenue by Significant Customer [Table Text Block]	'
		Period From August 14, 2013, through December 31, 2013
	QEP (revenue from affiliate)	$	32.8
	Questar Gas Company	7.5

Initial_Public_Offering_Tables

Initial Public Offering (Tables)	12 Months Ended
	Dec. 31, 2013
Reconciliation of proceeds from Offering [Abstract]	'
Reconciliation of Proceeds from Offering [Table Text Block]	'
	Total proceeds from the IPO	$	483
	Offering costs	(33.4		)
	Net proceeds from the IPO	449.6
	Revolving credit facility origination fees	(3.0		)
	Repayment of outstanding debt with QEP	(95.5		)
	Net proceeds distributed to QEP from the IPO	$	351.1
Schedule of Other Ownership Interests [Table Text Block]	'
		Units			% Ownership
	Limited partner common units - QEP	3,701,750			6.8	%
	Limited partner common units - public	23,008,998			42.2	%
	Limited partner subordinated units - QEP	26,705,000			49	%
	General partner units	1,090,117			2	%
	Total QEP Midstream units	54,505,865
Net Assets Contributed [Table Text Block]	'
	Cash and cash equivalents	$	1.1
	Accounts receivable, net	26.4
	Property, plant and equipment, net	485.6
	Investment in unconsolidated affiliate	27.9
	Account payable and accrued expenses	(21.1		)
	Long-term debt to related party	(95.5		)
	Asset Retirement Obligation	(11.8		)
	Other liabilities	(4.8		)
	Net assets	$	407.8

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2013
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions [Table Text Block]	'
		Period From January 1, 2013, through August 13, 2013			Year Ended December 31, 2012			Year Ended December 31, 2011
		(in millions)
	Revenues from affiliate	$	55		$	79.7		69.5
	Interest expense to affiliate	(2.6		)	(8.7		)	(12.8	)

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment [Table Text Block]	'
	A summary of the historical cost of QEP Midstream's property, plant and equipment is as follows:
		Estimated Useful	31-Dec-13			31-Dec-12
		Lives
			Successor			Predecessor
			(in millions)
	Gathering equipment	5 to 40 years	$	737.9		$	907.7
	General support equipment	3 to 30 years	—			11.1
	Total property, plant and equipment		737.9			918.8
	Accumulated depreciation		(244.5		)	(284.7		)
	Total net property, plant and equipment		$	493.4		$	634.1

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2013
Asset Retirement Obligation [Abstract]	'
Schedule of Change in Asset Retirement Obligation [Table Text Block]	'
	The following is a reconciliation of the changes in the ARO liability for the periods specified below (in millions):
		2013
		Asset Retirement
		Obligations
		Predecessor
	ARO liability at January 1,	$	16.3
	Accretion	0.7
	ARO liability at August 13,(1)	$	17
		Successor
	ARO liability at August 14,	$	11.8
	Accretion	0.3
	Liabilities incurred	0.3
	Revisions	1
	Liabilities Settled	(0.1		)
	ARO liability at December 31,	$	13.3
	(1)	The ending balance of the Predecessor includes the assets that were retained by QEP Field Services and not conveyed to the Partnership in connection with the IPO. See Note 1 - Description of Business and Basis of Presentation, for additional information on the Partnership's assets.

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Phantom Unit Award Activity [Abstract]	'
Phantom Unit Award Activity [Table Text Block]	'
		Phantom Units Outstanding		Weighted-Average Grant-Date Fair Value
	Unvested balance at beginning of the period	—		$	—
	Granted	39,500		22.03
	Vested	—		—
	Forfeited	(1,250	)	22.03
	Unvested balance at December 31, 2013	38,250		$	22.03

Net_Income_Per_Limited_Partner1

Net Income Per Limited Partner Unit (Tables)	12 Months Ended
	Dec. 31, 2013
Net Income Per Limited Partner Unit [Abstract]	'
Distributions Made to Limited Partner, by Distribution [Table Text Block]	'
	Net income attributable to QEP Midstream	$	19.1
	General partner's distribution declared(1)	(0.5		)
	Limited partners' distribution declared on common units(1)	(10.4		)
	Limited partners' distribution declared on subordinated units(1)	(10.4		)
	Distribution in excess of net income attributable to QEP Midstream	$	(2.2	)
		General Partner			Limited Partners' Common Units			Limited Partners' Subordinated Units			Total
		(in million, except per unit amounts)
	Net income attributable to QEP Midstream:
	Distribution declared	$	0.5		$	10.4		$	10.4		$	21.3
	Distributions in excess of net income attributable to QEP Midstream	—			(1.1		)	(1.1		)	(2.2		)
	Net income attributable to QEP Midstream	$	0.5		$	9.3		$	9.3		$	19.1
	Weighted-average limited partner units outstanding:
	Basic and Diluted	1.1			26.7			26.7			54.5
	Net income per limited partner unit attributable to the QEP Midstream
	Basic and Diluted				$	0.35		$	0.35

Quarterly_Financial_Informatio1

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
2013 Quarterly Financial Information [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
		First Quarter		Second Quarter		Third Quarter		Fourth Quarter
	2012 - Predecessor	(in millions)
	Revenues	$	41.9	$	39.7	$	40.8	$	39.8
	Operating income	20.5		18.2		17.3		16.4
	Net income	20.6		17.3		18.2		14.9
	Net income attributable to Predecessor	19.8		16.4		17.2		13.9
		First Quarter		Second Quarter		Period from July 1, 2013 to August 13, 2013		Period from August 14, 2013 to September 30, 2013		Fourth Quarter
		Predecessor		Predecessor		Predecessor		Successor		Successor
	2013	(in millions, except per unit amounts)
	Revenues	$	40.1	$	40.1	$	20.1	$	16.4	$	31.7
	Operating income	15.8		16.6		7.8		7.4		12.9
	Net income	16		17.7		7.7		7.1		13.5
	Net income attributable to QEP Midstream or Predecessor	15.4		16.4		7.1		6.5		12.6
	Net income attributable to QEP Midstream Partners, LP subsequent to initial public offering per limited partner unit:
	Common	—		—		—		$	0.12	$	0.23
	Subordinated	—		—		—		0.12		0.23
	Distributions declared per limited partner common unit	—		—		—		0.13		0.26

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Details)	0 Months Ended
	Aug. 14, 2013	Dec. 31, 2013
Limited Partners' Capital Account [Line Items]	'	'
Partner's Capital Account, Common Units, Sold to Underwriters	3,000,000	'
Three Rivers Ownership Percentage	'	50.00%
Equity Method Investment, Ownership Percentage	'	38.00%
Uinta Basin Gathering Ownership Percentage	'	100.00%
Partners' Capital Account, Units, Sold in Public Offering	20,000,000	'
Majority Shareholder [Member]	'	'
Limited Partners' Capital Account [Line Items]	'	'
QEP Midstream Partners, LLC Ownership Percentage	'	100.00%
Rendevous Gas Services Ownership Percentage	'	78.00%

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details)	Dec. 31, 2013
Other Ownership Interests [Line Items]	'
Three Rivers Ownership Percentage	50.00%
Uintah Basin Field Services Ownership Percentage	38.00%
Majority Shareholder [Member]	'
Other Ownership Interests [Line Items]	'
Rendevous Gas Services Ownership Percentage	78.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies Allowance for doubtful accounts receivable (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'
Allowance for Doubtful Accounts Receivable	$0.40	$0.30

Summary_of_Significant_Account5

Summary of Significant Accounting Policies Credit Risk (Details) (USD $)

2 Months Ended

1 Months Ended

3 Months Ended

7 Months Ended

12 Months Ended

5 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Aug. 13, 2013

Dec. 31, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Aug. 13, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

QEP [Member]

Questar Gas Company [Member]

Concentration Risk [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from Related Parties

'

'

'

'

'

'

'

'

'

$55

$79.70

$69.50

$32.80

'

Revenues from significant customers

$16.40

$20.10

$31.70

$40.10

$40.10

$39.80

$40.80

$39.70

$41.90

'

'

'

'

$7.50

Initial_Public_Offering_Detail

Initial Public Offering (Details) (USD $)

0 Months Ended

0 Months Ended

0 Months Ended

5 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Aug. 14, 2013

Dec. 31, 2013

Aug. 13, 2013

Dec. 31, 2012

Aug. 14, 2013

Aug. 14, 2013

Dec. 31, 2013

Aug. 14, 2013

Aug. 14, 2013

Dec. 31, 2013

Dec. 31, 2013

Aug. 14, 2013

Aug. 14, 2013

Other Ownership Interest [Member]

Limited Partners Subordinated Units [Member]

QEP [Member]

Capital Units [Member]

Capital Units [Member]

Capital Units [Member]

Public [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Percent of total units owned [Domain]

Percent of total units owned [Domain]

Limited Partners Subordinated Units [Member]

Reconciliation of Proceeds from Offering [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds from initial public offering

$483

'

'

'

'

'

'

'

'

'

'

'

'

Cash and Cash Equivalents, at Carrying Value

1.1

'

'

'

'

'

'

'

'

'

'

'

'

General Partners' Capital Account, Units Issued

'

'

'

'

'

'

'

'

'

'

'

1,090,000

'

Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

Limited Partners' Capital Account, Units Outstanding

0

38,250

'

'

'

'

3,701,750

6,701,750

'

'

23,008,998

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

'

'

'

'

'

'

'

'

12.30%

6.80%

'

'

49.00%

Partners' Capital Account, Units

'

54,505,865

'

'

'

26,705,000

'

'

'

'

'

'

'

Partners' Capital Account, Units, Sold in Public Offering

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance Initial Public Offering

420

'

'

'

'

'

'

'

'

'

'

'

'

Offering costs

-33.4

'

'

'

'

'

'

'

'

'

'

'

'

Offering costs

29.3

'

'

'

'

'

'

'

'

'

'

'

'

Partner's Capital Account, Common Units, Sold to Underwriters

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds from the Offering

449.6

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility origination fees

-3

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of outstanding debt with QEP

-95.5

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds distributed to QEP from the Offering

351.1

'

'

'

'

'

'

'

'

'

'

'

'

Partners Capital Account Units Sold In Public Offering Price Per Unit

$21

'

'

'

'

'

'

'

'

'

'

'

'

Net Proceeds From Issuance Initial Public Offering

390.7

'

'

'

'

'

'

'

'

'

'

'

'

Net Proceeds From Issuance of Units to Underwriters

'

'

'

'

58.9

'

'

'

'

'

'

'

'

Offering Costs from issuance of units to underwriters

'

'

'

'

4.1

'

'

'

'

'

'

'

'

Accounts Receivable, Net

26.4

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

485.6

'

'

'

'

'

'

'

'

'

'

'

'

Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures

27.9

'

'

'

'

'

'

'

'

'

'

'

'

Accounts Payable and Accrued Liabilities, Current

-21.1

'

'

'

'

'

'

'

'

'

'

'

'

Asset Retirement Obligation

-11.8

-13.3

-17

-16.3

'

'

'

'

'

'

'

'

'

Other Liabilities

-4.8

'

'

'

'

'

'

'

'

'

'

'

'

Assets, Net

$407.80

'

'

'

'

'

'

'

'

'

'

'

'

Initial_Public_Offering_Partne

Initial Public Offering Partnership's Ownership (Details)	Dec. 31, 2013	Aug. 14, 2013	Dec. 31, 2013	Dec. 31, 2013	Aug. 14, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Feb. 28, 2014	Feb. 28, 2014
			Public [Member]	QEP [Member]	Capital Units [Member]	Percent of total units owned [Domain]	Percent of total units owned [Domain]	Percent of total units owned [Domain]	Percent of total units owned [Domain]	Limited Partners Subordinated Units [Member]	General Partner Units [Member]
							Public [Member]	QEP [Member]	Capital Units [Member]
Other Ownership Interests [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Ownership Percentage	'	'	'	'	'	2.00%	42.20%	49.00%	6.80%	'	'
Partners' Capital Account, Units	54,505,865	'	'	'	'	'	'	'	'	'	'
Limited Partners' Capital Account, Units Outstanding	38,250	0	23,008,998	3,701,750	6,701,750	'	'	'	'	'	'
Entity Common Stock, Shares Outstanding	'	'	'	'	'	'	'	'	'	26,705,000	1,090,117

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)

0 Months Ended

5 Months Ended

7 Months Ended

12 Months Ended

12 Months Ended

9 Months Ended

5 Months Ended

In Millions, except Share data, unless otherwise specified

Aug. 14, 2013

Dec. 31, 2013

Aug. 13, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Jul. 31, 2012

Sep. 30, 2013

Dec. 31, 2013

Aug. 14, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Notes Payable, Other Payables [Member]

Notes Payable, Other Payables [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Capital Units [Member]

QEP [Member]

Percent of limited partner units owned [Domain]

Percent of total units owned [Domain]

Percent of total units owned [Domain]

Percent of total units owned [Domain]

QEP [Member]

Capital Units [Member]

Capital Units [Member]

QEP [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

6.80%

49.00%

'

QEP Limited Partner Ownership Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55.80%

'

'

'

'

Related Party Disclosure Threshold

'

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from Related Parties

'

'

$55

'

$79.70

$69.50

'

'

'

'

'

'

'

'

'

'

'

'

$32.80

Limited Partners' Capital Account, Units Outstanding

0

38,250

'

38,250

'

'

'

'

'

'

'

'

6,701,750

3,701,750

'

'

'

'

'

Omnibus Agreement Annual Payment

'

'

'

13.8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Omnibus Agreement G&A payment for Executive's Salary

'

'

'

1.4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Omnibus Agreement G&A payment

'

4.6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Current Borrowing Capacity

'

'

'

'

'

'

'

250

'

250

'

1,000

'

'

'

'

'

'

'

Debt Instrument, Maturity Date Range, Start

'

'

'

'

'

'

'

'

1-Apr-13

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date Range, End

'

'

'

'

'

'

'

'

1-Apr-14

'

1-Apr-17

'

'

'

'

'

'

'

'

Long-term Debt, Weighted Average Interest Rate

'

6.00%

'

6.00%

'

'

6.05%

5.20%

'

'

'

'

'

'

'

'

'

'

'

Interest Paid

'

'

2.8

'

3.2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of Debt at IPO date

-95.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Related Party Debt

-95.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense to affiliate

'

'

($2.60)

'

($8.70)

($12.80)

'

'

'

'

'

'

'

'

'

'

'

'

'

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	Aug. 14, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified		Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Successor [Member]	Successor [Member]	Successor [Member]
			Gas Gathering and Processing Equipment [Member]	Gas Gathering and Processing Equipment [Member]	Gas Gathering and Processing Equipment [Member]	Support Equipment and Facilities [Member]	Support Equipment and Facilities [Member]	Support Equipment and Facilities [Member]		Gas Gathering and Processing Equipment [Member]	Support Equipment and Facilities [Member]
				Minimum [Member]	Maximum [Member]		Minimum [Member]	Maximum [Member]
Property, Plant and Equipment [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Gathering equipment	'	$918.80	$907.70	'	'	$11.10	'	'	$737.90	$737.90	$0
Property, Plant and Equipment, Useful Life	'	'	'	'5 years	'40 years	'	'3 years	'30 years	'	'	'
Accumulated depreciation	'	-284.7	'	'	'	'	'	'	-244.5	'	'
Total net property, plant and equipment	$485.60	$634.10	'	'	'	'	'	'	$493.40	'	'

Asset_Retirement_Obligations_D

Asset Retirement Obligations (Details) (USD $)	1 Months Ended	5 Months Ended
In Millions, unless otherwise specified	Aug. 13, 2013	Dec. 31, 2013	Aug. 14, 2013	Dec. 31, 2012
Asset Retirement Obligation [Abstract]	'	'	'	'
Asset Retirement Obligation	$17	$13.30	$11.80	$16.30
Asset Retirement Obligation, Accretion Expense	0.7	0.3	'	'
Asset Retirement Obligation, Liabilities Incurred	'	0.3	'	'
Asset Retirement Obligation, Revision of Estimate	'	1	'	'
Asset Retirement Obligation, Liabilities Settled	'	($0.10)	'	'

Debt_Details

Debt (Details) (USD $)	0 Months Ended	5 Months Ended
In Millions, unless otherwise specified	Aug. 14, 2013	Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]	'	'
Line of Credit Facility, Commitment Fee Amount	'	$0.70
QEP Midstream Credit Facility	'	500
QEP Midsteam Credit Facility Maximum Amount	'	750
Repayments of Related Party Debt	($95.50)	'

EquityBased_Compensation_Detai

Equity-Based Compensation (Details) (USD $)	5 Months Ended
	Dec. 31, 2013	Aug. 14, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Limited Partners' Capital Account, Units Outstanding	38,250	0
Weighted-Average Grant Date Fair Value Unvested Balance	$22.03	$0
Units granted	39,500	'
Weighted-Average Fair Value - Shares Forfeited	22.03	'
Units Available for Issuance	'	5,341,000
Weighted Average Fair Value - Shares Granted	22.03	'
Units vested	0	'
Weighted Average Fair Value - Shares Vested	0	'
Units Forfeited	-1,250	'
Unrecognized Option Plan Expense	700,000	'
August 14, 2013 Grant [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	3,250	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$21	'
November 8, 2013 Grant [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	5,748	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$22.62	'
Successor [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Equity-based compensation expense	$400,000	'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments and Contingencies [Abstract]	'
Deferred Revenue	$8.50

Net_Income_Per_Limited_Partner2

Net Income Per Limited Partner Unit (Details) (USD $)

2 Months Ended

1 Months Ended

3 Months Ended

5 Months Ended

Share data in Millions, except Per Share data, unless otherwise specified

Sep. 30, 2013

Aug. 13, 2013

Dec. 31, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Jan. 23, 2014

Oct. 23, 2013

Distribtutions in Excess of Net Income [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Quarterly Distribution

'

'

'

'

'

'

'

'

'

'

$14,200,000

$7,100,000

Partners' Capital Account, Distributions

0.13

0

0.26

0

0

'

'

'

'

21,300,000

'

'

Distribution in Excess of Income

'

'

'

'

'

'

'

'

'

-2,200,000

'

'

Weighted Average Limited Partnership Units Outstanding, Basic

'

'

'

'

'

'

'

'

'

54.5

'

'

Net income attributable to QEP Midstream

6,500,000

7,100,000

12,600,000

16,400,000

15,400,000

13,900,000

17,200,000

16,400,000

19,800,000

19,100,000

'

'

General partner's distribution declared(1)

'

'

'

'

'

'

'

'

'

-500,000

'

'

Partners' Capital Account, Distribution Per Unit of Limited Partner Interest

'

'

'

'

'

'

'

'

'

'

$0.26

$0.13

Limited Partners Common Units [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Distribtutions in Excess of Net Income [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Distribution in Excess of Income

'

'

'

'

'

'

'

'

'

-1,100,000

'

'

Weighted Average Limited Partnership Units Outstanding, Basic

'

'

'

'

'

'

'

'

'

26.7

'

'

Weighted Average Number of Shares Outstanding, Basic and Diluted

'

'

'

'

'

'

'

'

'

26.7

'

'

Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic, Net of Tax

'

'

'

'

'

'

'

'

'

$0.35

'

'

Net income attributable to QEP Midstream

'

'

'

'

'

'

'

'

'

9,300,000

'

'

Limited partners' distribution declared on common units(1)

'

'

'

'

'

'

'

'

'

10,400,000

'

'

Limited Partners Subordinated Units [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Distribtutions in Excess of Net Income [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Distribution in Excess of Income

'

'

'

'

'

'

'

'

'

-1,100,000

'

'

Weighted Average Limited Partnership Units Outstanding, Basic

'

'

'

'

'

'

'

'

'

26.7

'

'

Weighted Average Number of Shares Outstanding, Basic and Diluted

'

'

'

'

'

'

'

'

'

26.7

'

'

Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic, Net of Tax

'

'

'

'

'

'

'

'

'

$0.35

'

'

Net income attributable to QEP Midstream

'

'

'

'

'

'

'

'

'

9,300,000

'

'

Limited partners' distribution declared on common units(1)

'

'

'

'

'

'

'

'

'

10,400,000

'

'

General Partner Units [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Distribtutions in Excess of Net Income [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Distribution in Excess of Income

'

'

'

'

'

'

'

'

'

0

'

'

Weighted Average Limited Partnership Units Outstanding, Basic

'

'

'

'

'

'

'

'

'

1.1

'

'

Net income attributable to QEP Midstream

'

'

'

'

'

'

'

'

'

$500,000

'

'

Quarterly_Financial_Informatio2

Quarterly Financial Information (Details) (USD $)	2 Months Ended	1 Months Ended	3 Months Ended							5 Months Ended	7 Months Ended	12 Months Ended
	Sep. 30, 2013	Aug. 13, 2013	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Aug. 13, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$16,400,000	$20,100,000	$31,700,000	$40,100,000	$40,100,000	$39,800,000	$40,800,000	$39,700,000	$41,900,000	'	'	'	'
Operating income	7,400,000	7,800,000	12,900,000	16,600,000	15,800,000	16,400,000	17,300,000	18,200,000	20,500,000	'	'	'	'
Net income	7,100,000	7,700,000	13,500,000	17,700,000	16,000,000	14,900,000	18,200,000	17,300,000	20,600,000	'	41,400,000	71,000,000	63,500,000
Net income attributable to QEP Midstream	6,500,000	7,100,000	12,600,000	16,400,000	15,400,000	13,900,000	17,200,000	16,400,000	19,800,000	19,100,000	'	'	'
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$0.12	$0	$0.23	$0	$0	'	'	'	'	'	'	'	'
Partners' Capital Account, Distributions	$0.13	$0	$0.26	$0	$0	'	'	'	'	$21,300,000	'	'	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	Jan. 23, 2014	Oct. 23, 2013
In Millions, except Per Share data, unless otherwise specified
Subsequent Event [Line Items]	'	'
Quarterly Distribution	$14.20	$7.10
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest	$0.26	$0.13