KNOT Offshore Partners (KNOP) 6-K 26 Sep 14 2014 Q2 Current report (foreign) Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014
Document And Entity Information [Abstract]	'
Document Type	'6-K
Amendment Flag	'false
Document Period End Date	30-Jun-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q2
Entity Registrant Name	'KNOT Offshore Partners LP
Entity Central Index Key	'0001564180
Current Fiscal Year End Date	'--12-31

Condensed_Consolidated_and_Com

Condensed Consolidated and Combined Carve-Out Statements of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Time charter and bareboat revenues	$22,116	$17,268	$43,882	$30,480
Loss of hire insurance recoveries	'	'	'	250
Other income	3	'	11	'
Total revenues (note 4, 5 and 10)	22,119	17,268	43,893	30,730
Operating expenses: (note 10)	'	'	'	'
Vessel operating expenses	4,324	3,251	8,921	6,031
Depreciation and amortization	6,782	5,340	13,562	10,680
General and administrative expenses	1,461	1,269	2,504	3,399
Total operating expenses	12,567	9,860	24,987	20,110
Operating income	9,552	7,408	18,906	10,620
Finance income (expense) (note 10):	'	'	'	'
Interest income	3	3	4	9
Interest expense	-3,856	-2,529	-6,569	-5,289
Other finance expense	-914	-492	-1,135	-1,648
Realized and unrealized loss on derivative instruments (note 6)	-2,342	-434	-2,296	-87
Net gain (loss) on foreign currency transactions	36	15	12	142
Total finance expense	-7,073	-3,437	-9,984	-6,873
Income before income taxes	2,479	3,971	8,922	3,747
Income tax benefit (expense) (note 9)	18	'	-1	-2,942
Net income	2,497	3,971	8,921	805
General Partner's interest in net income	50	79	177	16
Limited Partner's interest in net income	$2,447	$3,892	$8,744	$789

Condensed_Consolidated_and_Com1

Condensed Consolidated and Combined Carve-Out Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$2,497	$3,971	$8,921	$805
Other comprehensive income, net of tax	'	'	'	'
Comprehensive income	$2,497	$3,971	$8,921	$805

Condensed_Consolidated_and_Com2

Condensed Consolidated and Combined Carve-Out Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents (note 7)	$34,451	$28,836
Restricted cash (note 7)	691	458
Trade accounts receivable, less allowance for doubtful accounts of $0 in June 30, 2014 and $0 in December 31, 2013	'	'
Amounts due from related parties (note 10)	44	77
Inventories	1,076	578
Derivative assets (note 6 and 7)	'	248
Other current assets	4,171	1,814
Total current assets	40,433	32,011
Vessels and equipment:	'	'
Vessels	1,027,861	692,926
Less accumulated depreciation and amortization	-88,704	-75,141
Net property, plant, and equipment	939,157	617,785
Goodwill	6,217	5,750
Deferred debt issuance cost	2,924	2,010
Derivative assets (note 6 and 7)	2,561	2,617
Total assets	991,292	660,173
Current liabilities:	'	'
Trade accounts payable	1,435	1,107
Accrued expenses	3,649	2,642
Current installments of long-term debt (note 7 and 8)	38,781	29,269
Derivative liabilities (note 6 and 7)	3,710	2,124
Income taxes payable (note 9)	188	743
Contract liabilities	1,518	1,518
Prepaid charter and deferred revenue	7,847	4,471
Amounts due to related parties (note 10)	3,518	163
Total current liabilities	60,646	42,037
Long-term liabilities:	'	'
Long-term debt, excluding current installments (note 7 and 8)	506,993	310,359
Derivative liabilities (note 6 and 7)	'	'
Contract liabilities	12,034	12,793
Deferred tax liabilities (note 9)	2,124	2,141
Long term debt from related parties	'	10,349
Other long-term liabilities	5,128	567
Total liabilities	586,925	378,246
Commitments and contingencies (note 11)	'	'
Partners' capital:	'	'
Subordinated unitholders	104,765	107,857
General partner interest	7,834	5,297
Total partners' capital	404,367	281,927
Total liabilities and equity	991,292	660,173
Common Units [Member]	'	'
Partners' capital:	'	'
Total partners' capital	$291,768	$168,773

Condensed_Consolidated_and_Com3

Condensed Consolidated and Combined Carve-Out Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Allowance for doubtful accounts	$0	$0

Condensed_Consolidated_and_Com4

Condensed Consolidated and Combined Carve-Out Statements of Changes in Partners' Capital / Owners' Equity (USD $)		Total	KNOT [Member]	Common Units [Member]	Subordinated Units [Member]	Subordinated Units [Member]	General Partner Unit [Member]	Owners' Invested Equity [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands						KNOT [Member]
Beginning Balance at Dec. 31, 2012		$97,194	'	'	'	'	'	$97,194	'
Net income (loss)		-3,538	'	'	'	'	'	-3,538	'
Other comprehensive income (loss)		'	'	'	'	'	'	'	'
Movement in invested equity		10,882	'	'	'	'	'	10,882	'
Ending Balance at Apr. 15, 2013		104,538	'	'	'	'	'	104,538	'
Cash distributions		'	-21,954	'	'	-21,954	'	'	'
Proceeds from initial public offering		168,313	'	168,313	'	'	'	'	'
Offering cost		-2,201	'	-2,201	'	'	'	'	'
Post initial public offering net income		4,343	'	2,718	1,514	'	111	'	'
Other comprehensive income (loss)		'	'	'	'	'	'	'	'
Elimination of equity not transferred to the Partnership (Note 2)		27,792	'	'	'	'	'	27,792	'
Allocation of Partnership capital to unitholders		'	'	'	127,141	'	5,189	-132,330	'
Ending Balance at Jun. 30, 2013		280,831	'	168,830	106,701	'	5,300	'	'
Beginning Balance at Dec. 31, 2013		281,927	'	168,773	107,857	'	5,297	'	'
Net income (loss)		8,921	'	4,362	4,382	'	177	'	'
Cash distributions	[1]	-15,232	'	-7,454	-7,474	'	-304	'	'
Proceeds from initial public offering		129,066	'	126,397	'	'	2,669	'	'
Offering cost		-315	'	-310	'	'	-5	'	'
Other comprehensive income (loss)		'	'	'	'	'	'	'	'
Ending Balance at Jun. 30, 2014		$404,367	'	$291,768	$104,765	'	$7,834	'	'
[1]	This includes cash distributions to holders of the incentive distribution rights ("IDRs") for the six months ended June 30, 2014 of $0.02 million.

Condensed_Consolidated_and_Com5

Condensed Consolidated and Combined Carve-Out Statements of Changes in Partners' Capital / Owners' Equity (Parenthetical) (Common Units [Member], USD $)	3 Months Ended	6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2014
Common units issued	8,567,500	4,600,000
Common units sold pursuant to the full exercise of underwriters' options	1,117,500	'
Underwriting discount	$11,605	$4,381

Condensed_Consolidated_and_Com6

Condensed Consolidated and Combined Carve-Out Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013
Cash flows provided by operating activities:	'		'
Net income (loss)	$8,921		$805
Adjustments to reconcile net income to cash provided by operating activities:	'		'
Depreciation and amortization	13,562		10,680
Amortization of contract intangibles / liabilities	-759		-759
Amortization of deferred debt issuance cost	1,695		1,116
Income tax expense	1		193
Income taxes paid	-562		'
Unrealized loss (gain) on derivative instruments	1,542		-1,029
Unrealized loss (gain) on foreign currency transactions	12		10
Other items	-211		-214
Changes in operating assets and liabilities:	'		'
Decrease (increase) in trade accounts receivable	'		99	[1]
Decrease (increase) in inventories	-103	[1]	52	[1]
Decrease (increase) in other current assets	-300	[1]	2,545	[1]
Decrease (increase) in amounts due from related parties	37	[1]	-898	[1]
Increase (decrease) in trade accounts payable	-62	[1]	79	[1]
Increase (decrease) in payable to related parties	30	[1]	1,927	[1]
Increase (decrease) in accrued expenses	-353	[1]	26	[1]
Increase (decrease) prepaid revenue	1,890	[1]	-3,779	[1]
Net cash provided by operating activities	25,340		10,853
Cash flows from investing activities:	'		'
Additions to vessel and equipment	65		'
Acquisition of Hilda Knutsen and Torill Knutsen (net of cash acquired)	-105,296	[2]	'
Net cash used in investing activities	-105,231		'
Cash flows from financing activities:	'		'
Proceeds from long-term debt	240,000		'
Repayment of long-term debt	-255,667		-130,397
Repayment of long-term debt from related parties	-10,612		'
Accumulated interests to related parties	263		'
Payments of debt issuance cost	-2,727		-653
Payables to related parties	987		-9,718
Contributions from / distribution to owner, net	'		11,623
Proceeds from initial public offering, net of underwriters' discount	129,066		168,313
Cash distribution to KNOT	'		-21,954
Offering cost	-315		-2,201
Cash distribution	-15,232		'
Change in restricted cash	-233		-1,910
Net cash provided by (used in) financing activities	85,530		13,103
Effect of exchange rate changes on cash	-24		-25
Net increase (decrease) in cash and cash equivalents	5,615		23,931
Cash and cash equivalents at beginning of period	28,836		1,287
Cash and cash equivalents at end of period	$34,451		$25,218
[1]	Net of effects from purchase of Hilda Knutsen and Torill Knutsen
[2]	(In addition to the cash consideration paid for the acquisition, there were other purchase price adjustments of $987 (see Note 13 - Business Acquisitions)

Condensed_Consolidated_and_Com7

Condensed Consolidated and Combined Carve-Out Statements of Cash Flows (Parenthetical) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Operating Cash Flows Direct Method [Abstract]	'
Purchase price adjustments	$987

Description_of_Business

Description of Business	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Description of Business	'
	1) Description of Business
	KNOT Offshore Partners LP (the “Partnership”) was formed as a limited partnership under the laws of the Republic of the Marshall Islands and is 40% owned by Knutsen NYK Offshore Tankers AS (“KNOT”). The Partnership was formed for the purpose of acquiring 100% ownership interests in four shuttle tankers in connection with the Partnership’s initial public offering of its common units (the “IPO”), which was completed on April 15, 2013.
	The Partnership was established prior to the closing of the IPO. In connection with the consummation of the IPO, through KNOT Offshore Partners UK LLC (“KNOT UK”), a 100% owned limited liability company formed under the laws of the Marshall Islands, the Partnership acquired a 100% ownership interest in KNOT Shuttle Tankers AS, a wholly owned subsidiary of KNOT, which as of February 27, 2013 directly or indirectly owned (1) 100% of Knutsen Shuttle Tankers XII KS, the owner of the Recife Knutsen and the Fortaleza Knutsen , (2) 100% of Knutsen Shuttle Tankers XII AS, the general partner of Knutsen Shuttle Tankers XII KS, and (3) the Windsor Knutsen and the Bodil Knutsen and all of their related charters, inventory and long-term debt. In establishing the new KNOT Shuttle Tankers AS structure, KNOT formed three new Norwegian subsidiaries, which acquired 90% of Knutsen Shuttle Tankers XII KS, 100% of the Windsor Knutsen and 100% of the Bodil Knutsen , respectively.
	In connection with the consummation of the IPO, (1) the Partnership issued to KNOT 8,567,500 subordinated units, representing a 49.0% limited partner interest in the Partnership, and 100% of the incentive distribution rights (“IDRs”); (2) KNOT Offshore Partners GP LLC, a wholly owned subsidiary of KNOT and the general partner of the Partnership (the “General Partner”), continued its 2.0% general partner interest in the Partnership; and (3) the Partnership issued and sold to the public, through the underwriters, 8,567,500 common units (including 1,117,500 common units sold pursuant to the full exercise of the underwriters’ option to purchase additional units), representing a 49.0% limited partner interest in the Partnership. The Partnership received gross proceeds before underwriting discounts, the structuring fee and estimated offering expenses of approximately $179.9 million in connection with the IPO, all as further described in Note 3—Formation Transactions and Initial Public Offering.
	For periods prior to April 15, 2013 (the closing of the IPO), the Partnership and its subsidiaries that had interests in the Windsor Knutsen, the Bodil Knutsen, the Recife Knutsen and the Fortaleza Knutsen are collectively referred to as the “Combined Entity.” The transfers and contributions of the subsidiaries holding interests in the Windsor Knutsen, the Bodil Knutsen, the Recife Knutsen and the Fortaleza Knutsen from KNOT to the Partnership in connection with the IPO were deemed to be a reorganization of entities under common control. As a reorganization of entities under common control, the transfer of the subsidiaries and other net assets has been recorded at KNOT’s historical book value.
	Pursuant to the Partnership’s First Amended and Restated Agreement of Limited Partnership (the “Partnership Agreement”), the General Partner has irrevocably delegated to the Partnership’s board of directors the power to oversee and direct the operations of, manage and determine the strategies and policies of the Partnership. During the period from the IPO until the time of the Partnership’s first annual meeting of unitholders (“AGM”) on June 25, 2013, the General Partner retained the sole power to appoint, remove and replace all members of the Partnership’s board of directors. At the first AGM, four of the seven board members became electable by the common unitholders and accordingly, from this date, KNOT, as the owner of the General Partner, no longer retained the power to control the Partnership’s board of directors and hence the Partnership. As a result, the Partnership is no longer considered to be under common control with KNOT, and, as a consequence, the Partnership no longer accounts for any vessel acquisitions from KNOT after June 25, 2013 as a transfer of equity interests between entities under common control.
	On August 1, 2013, the Partnership’s wholly owned subsidiary, KNOT Shuttle Tankers AS, acquired Knutsen Shuttle Tankers 13 AS, the company that owns the Carmen Knutsen, from KNOT. The acquisition of the Carmen Knutsen was accounted for as an acquisition of a business. Accordingly, the results of the Carmen Knutsen are consolidated into the Partnership’s results from the date of its acquisition. There has been no retroactive restatement of the Partnership’s financial statements to reflect the historical results of the Carmen Knutsen prior to its acquisition.
	On June 27, 2014, the Partnership’s issued and sold 4,600,000 common units in an underwritten public offering (the “June 2014 Offering”). In connection with the June 2014 Offering, the Partnership also granted the underwriter the option to purchase an additional 690,000 common units. In connection with the partial exercises (the “Option Exercises”) by the underwriters of their option to purchase additional common units, on July 14, 2014 and July 24, 2014, the Partnership issued and sold 150,000 common units and 490,000 common units, respectively, and the General Partner made additional capital contributions to the Partnershipin order to maintain its 2% general partner interest in the Partnership.
	The net proceeds from the June 2014 Offering and the Option Exercises (an aggregate of $143.7 million) and related capital contributions by the General Partner (an aggregate of $3.0 million) were used to fund the purchase price of the acquisitions of the companies that own the Hilda Knutsen and the Torill Knutsen from Knutsen NYK Offshore Tankers AS and for general partnership purposes.
	On June 30, 2014, the Partnership’s wholly owned subsidiary, KNOT Shuttle Tanker AS, acquired Knutsen Shuttle Tankers 14 AS and Knutsen Shuttle Tankers 15 AS, the companies that own the Hilda Knutsen and Torill Knutsen, respectively, from KNOT. The acquisitions of the Hilda Knutsen and Torill Knutsen were accounted for as an acquisition of businesses. Accordingly, the results of operations of the Hilda Knutsen and Torill Knutsen are consolidated into the Partnership’s results as of the date of their acquisitions (Note 13 – Business Acquisitions).
	Each of the Windsor Knutsen, the Bodil Knutsen, the Recife Knutsen, the Fortaleza Knutsen, the Carmen Knutsen, the Hilda Knutsen, and the Torill Knutsen are referred to as a “Vessel” and, collectively, as the “Vessels.” As of June 30, 2014, the Partnership operates a fleet of seven vessels. The Vessels operate under fixed long-term charter contracts to charterers, except for the Windsor Knutsen. In April 2014, the Partnership was notified that BG Group would not exercise its option to extend the Windsor Knutsen time charter after the expiration of its initial term. In July 2014, the vessel was re-delivered. In June 2014, the Partnership entered into a new two-year time charter contract with BG Group for the Windsor Knutsen that will commence in October 2015 and has three one-year extension options. Prior to the commencement of its time charter with BG Group, the Windsor Knutsen will be employed under a time-charter with KNOT. The time charter for the Bodil Knutsen expires in 2016 and contains customer options for extension through 2019. The Recife Knutsen and the Fortaleza Knutsen are under bareboat charter contracts that expire in 2023. The time charter for the Carmen Knutsen expires in 2018 and contains customer options for extension through 2021. The time charters for the Hilda Knutsen and the Torill Knutsen each expire in 2018 and contain a customer option for extension through 2023.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2) Summary of Significant Accounting Policies
	(a) Basis of Preparation
	The accompanying unaudited condensed consolidated and combined carve-out financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for interim financial information. All intercompany balances and transactions are eliminated. The unaudited condensed consolidated and combined carve-out financial statements do not include all the disclosures and information required for a complete set of annual financial statements; and, therefore, these unaudited condensed consolidated and combined carve-out financial statements should be read in conjunction with the audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, which are included in the Partnership’s Annual Report on Form 20-F for the year ended December 31, 2013 (the “20-F”).
	As of April 16, 2013, the financial statements of the Partnership as a separate legal entity are presented on a consolidated basis. Prior to April 16, 2013, the results of operations, cash flow and balance sheet have been carved out of the consolidated financial statements of KNOT and therefore are presented on a combined carve-out basis. The Combined Entity’s historical combined financial statements include assets, liabilities, revenues, expenses and cash flows directly attributable to the Partnership’s interests in the Vessels. Accordingly, the historical condensed consolidated and combined carve-out interim financial statements prior to April 16, 2013 reflect allocations of certain expenses, including that of general and administrative expenses, mark-to-market valuations of interest rate swap derivatives, interest expense on related party payables, and net gain (loss) on foreign currency transactions. The basis for the allocations is described in Note 2 of the audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, included in the Partnership’s 20-F. These allocated costs have been accounted for as equity contribution in the condensed consolidated and combined carve-out balance sheets.
	Included in the Combined Entity’s equity prior to April 16, 2013, are amounts (net liabilities of $27.8 million) relating to certain assets and liabilities that were carved out as they were readily separable and identifiable within the books of KNOT. However, these amounts have been retained by KNOT and have not been transferred to the Partnership and therefore have been eliminated from the Partnership’s opening equity as of April 16, 2013. Details of the net liabilities eliminated are as follows:
	(US $ in thousands)
	Balance Sheet captions:
	Other current assets		89
	Other non-current assets		—
	Other current liabilities (*)		(6,321	)
	Other long-term liabilities (*)		(21,560	)
	Net Liabilities		(27,792	)
	(*)	The majority of the assets and liabilities not transferred to the Partnership are related to interest swap derivatives (note 6) and insurance proceeds in accordance with Contribution and Sale Agreement as of April 15, 2013 (Note 5 – Insurance Proceeds).
	Management believes that the allocations included in these unaudited condensed consolidated and combined carve-out financial statements are reasonable to present the financial position, results of operations and cash flows of the Partnership on a stand-alone basis. In the opinion of management these condensed consolidated and combined carve-out interim financial statements reflect all adjustments, of a normal recurring nature, necessary to present fairly in all material respects, the Partnership’s consolidated and combined carve-out interim financial statements for the three and six months ended June 30, 2014. However, the financial position, results of operations and cash flows of the Combined Entity as presented may differ from those that would have been achieved had the Partnership operated autonomously for all years presented as the Partnership would have had additional general and administrative expenses, including legal, accounting, treasury and regulatory compliance and other costs normally incurred by a stand-alone listed publicly traded entity. Accordingly, the comparative historical consolidated and combined interim financial statements do not purport to be indicative of the future financial position, results of operations or cash flows of the Partnership.
	Under the Partnership’s Partnership Agreement, the General Partner has irrevocably delegated to the Partnership’s board of directors the power to oversee and direct the operations of, manage and determine the strategies and policies of the Partnership. During the period from the IPO in April 2013 until the time of the Partnership’s first annual general meeting (“AGM”) on June 25, 2013, the General Partner retained the sole power to appoint, remove and replace all members of the Partnership’s board of directors. From the first AGM, four of the seven board members became electable by the common unitholders and accordingly, from this date, KNOT, as the owner of the General Partner, no longer retains the power to control the Partnership’s board of directors and, hence, the Partnership. As a result, the Partnership is no longer considered to be under common control with KNOT and as a consequence, the Partnership will not account for any vessel acquisitions from KNOT after June 25, 2013 as a transfer of equity interests between entities under common control.
	(b) Significant accounting policies
	The accounting policies adopted in the preparation of the unaudited condensed consolidated and combined carve-out interim financial statements are consistent with those followed in the preparation of the Partnership’s audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, as contained in the Partnership’s 20-F.
	(c) Adoption of New Accounting Standards
	In May 2014, the Financial Accounting Standards Board (or FASB ) issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers , (or ASU 2014-09 ). ASU 2014-09 will require entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This update creates a five-step model that requires entities to exercise judgment when considering the terms of the contract(s) which include (i) identifying the contract(s) with the customer, (ii) identifying the separate performance obligations in the contract, (iii) determining the transaction price, (iv) allocating the transaction price to the separate performance obligations, and (v) recognizing revenue when each performance obligation is satisfied. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2016 and shall be applied retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. Early adoption is not permitted. The Partnership is evaluating the effect of adopting this new accounting guidance.

Formation_Transactions_and_Ini

Formation Transactions and Initial Public Offering	6 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Formation Transactions and Initial Public Offering	'
	3) Formation Transactions and Initial Public Offering
	During April 2013, the following transactions in connection with the transfer of the interests in KNOT Shuttle Tankers AS and the subsequent IPO occurred:
	Capital Contribution
		(i)	KNOT contributed to the Partnership’s subsidiary, KNOT Offshore Partners UK LLC, its 100% interest in KNOT Shuttle Tankers AS, which directly or indirectly owned (1) Knutsen Shuttle Tankers XII KS, the owner of the M/T Recife Knutsen and the M/T Fortaleza Knutsen, (2) Knutsen Shuttle Tankers XII AS, the general partner of Knutsen Shuttle Tankers XII KS and (3) the M/T Windsor Knutsen and the M/T Bodil Knutsen and all of their related charter contracts, inventory and long-term debt. This has been accounted for as a capital contribution by KNOT to the Partnership. However, for the purpose of the historical combined carved-out financial statements, the net assets of the Vessels are included in the carve-out balance sheet as of December 31, 2012;
	Recapitalization of the Partnership
		(ii)	The Partnership issued to KNOT 8,567,500 subordinated units, representing a 49.0% limited partner interest in the Partnership, and 100% of the IDRs, which will entitle KNOT to increasing percentages of the cash the Partnership distributes in excess of $0.43125 per unit per quarter;
		(iii)	The Partnership issued 349,694 general partner units to the General Partner, KNOT Offshore Partners GP LLC, a wholly owned subsidiary of KNOT, representing a 2.0% general partner interest in the Partnership.
	Initial Public Offering
		(iv)	In connection with the IPO, the Partnership issued and sold through the underwriters, 8,567,500 common units (including 1,117,500 common units pursuant to the exercise in full of the underwriters’ option to purchase additional common units), representing a 49.0% limited partner interest in the Partnership. The price per common unit in the IPO was $21.00. The Partnership received gross proceeds of approximately $179.9 million in connection with the IPO. Expenses relating to the IPO, including, among other things, incremental costs directly attributable to the IPO, were deferred and charged against the gross proceeds of the IPO, whereas other costs have been expensed as incurred. The net proceeds of the IPO (approximately $160.7 million, after deducting underwriting discounts and commissions and structuring fees and offering expenses payable by the Partnership) have been used by the Partnership to make a cash distribution to KNOT of approximately $21.95 million (which equals net proceeds from the underwriters’ option exercised in full after deducting the underwriting discounts and commissions), to repay approximately $118.9 million of outstanding debt and pre-fund approximately $3.0 million of the Partnership’s one-time entrance tax into the Norwegian tonnage tax regime. The reminder of the net proceeds was made available for general partnership purposes.
	Agreements
	In connection with the IPO, at or prior to the closing of the IPO, the Partnership entered into several agreements including:
		•		An Administrative Services Agreement with KNOT Offshore Partners UK LLC, or KNOT UK, pursuant to which:
		•		KNOT UK agreed to provide to the Partnership administrative services; and
		•		KNOT UK is permitted to subcontract certain of the administrative services provided under the administrative services agreement to Knutsen OAS (UK) Ltd (or KOAS UK) and Knutsen OAS Shipping AS (or KOAS), both wholly owned subsidiaries of TS Shipping Invest AS (“TSSI”);
		•		Amended Technical Management Agreements with KNOT Management AS, a wholly owned subsidiary of KNOT, that govern the crew, technical management of the vessels in the fleet;
		•		Contribution and Sale Agreement with KNOT. See Note 2 (a) – Summary of Significant Accounting Policies: Basis of Preparation
		•		Amend certain of the Partnership’s existing vessel financing agreements to permit the transactions pursuant to which the Partnership acquired its initial fleet and to include a $20.0 million revolving credit facility;
		•		An Omnibus Agreement with KNOT, the General Partner and the other parties thereto (the “Omnibus Agreement”) governing, among other things:
		•		To what extent the Partnership and KNOT may compete with each other;
		•		The Partnership’s option to purchase the Carmen Knutsen within 24 months after the closing of the IPO, any of Hilda Knutsen, Torill Knutsen, Ingrid Knutsen, and Raquel Knutsen from KNOT within 24 months after KNOT notifies the Partnership’s Board of Directors of their respective acceptances by their charterers upon reaching an agreement with KNOT regarding the respective purchase prices;
		•		Certain rights of first offer on shuttle tankers operating under charters of five or more years;
		•		The provision of certain indemnities to the Partnership by KNOT; and
		•		KNOT’s guarantee of the payment of the hire rate under the existing Bodil Knutsen and Windsor Knutsen charters for a period of five years following the closing date of the IPO.

Segment_Information

Segment Information	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	4) Segment Information
	The Partnership has not presented segment information as it considers its operations to occur in one reportable segment, the shuttle tanker market. During the three and six months ended June 30, 2014 the Partnership’s fleet of five vessels operated under three time charters and two bareboat charters. During the three and six months ended June 30, 2013 the Partnership’s fleet of four vessels operated under two time charters and two bareboat charters. In both periods, pursuant to the time charters and bareboat charters, the charterer, not the Partnership, controls the choice of which trading areas the Partnership’s vessel will serve. Accordingly the Partnership’s management, including the chief operating decision makers, does not evaluate performance according to geographical region.
	The following table presents revenues and percentage of consolidated and combined revenues for customers that accounted for more than 10% of the Partnership’s consolidated and combined revenues during the three and six months ended June 30, 2014 and 2013. All of these customers are major international oil companies.
		Three Months Ended June 30,								Six Months Ended June 30,
	(U.S. Dollars in thousands)	2014				2013				2014				2013
	Brazil Shipping I Limited,	$	5,111	23	%	$	5,329	31	%	$	10,172	23	%	$	9,982	32	%
	a subsidiary of BG Group Plc
	Fronape International Company,		6,289	28	%		6,289	36	%		12,512	29	%		10,152	33	%
	a subsidiary of Petrobras Transporte S.A.
	Statoil ASA		5,646	26	%		5,650	33	%		11,113	25	%		10,346	34	%
	Repsol Sinopec Brasil, S.A.,		5,070	23	%		—				10,085	23	%		—
	a subsidiary of Repsol Sinopec Brasil, B.V.

Insurance_Proceeds

Insurance Proceeds	6 Months Ended
	Jun. 30, 2014
Extraordinary And Unusual Items [Abstract]	'
Insurance Proceeds	'
	5) Insurance Proceeds
	In March 2012, the Windsor Knutsen damaged its propeller. As a result, the Vessel was off-hire from April 1, 2012 to June 24, 2012 for repairs. Under the Partnership’s loss of hire policies, its insurer will pay the Partnership the hire rate agreed in respect of each vessel for each day, in excess of 14 deductible days, for the time that the Vessel is out of service as a result of damage, for a maximum of 180 days. The Partnership received payments for loss of hire insurance of $nil during the three and six months ended June 30, 2014, respectively. During the three and six months ended June 30, 2013, the Partnership received payments for loss of hire insurance of $nil and $0.3 million, respectively, which was recorded as a component of total revenues since day rates are recovered under terms of the policy.
	In addition, as of June 30, 2014 and April 15, 2013, the Partnership recorded $nil and $3.5 million, respectively, for the probable recoveries up to the amount of loss under hull and machinery insurance for the repairs as a result of the propeller damage to the Windsor Knutsen. This is classified under vessel operating expenses along with the cost of the repairs of $nil and $4.0 million, respectively.
	In accordance with the Contribution and Sale Agreement entered into as of April 15, 2013, insurance claims were not transferred to the Partnership upon closing, and, therefore, there is no claim in the consolidated and combined carve-out balance sheet as of December 31, 2013 and in the condensed consolidated and combined carve-out balance sheet as of June 30, 2014. See Consolidated and Combined Carve-Out Statements of Changes in Partners’ Capital/Owners’ Capital and Note 2(a)—Summary of Significant Accounting Policies: Basis of Preparation.

Derivative_Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	6) Derivative Instruments
	The unaudited condensed consolidated and combined carve-out financial statements include the results of interest rate swap contracts to manage the Partnership’s exposure related to changes in interest rates on its variable rate debt instruments and the results of foreign exchange forward contracts to manage its exposure related to changes in currency exchange rates on its operating expenses, mainly crew expenses, in other currency than USD and on its contract obligations. The Partnership does not apply hedge accounting for derivative instruments. The Partnership does not speculate using derivative instruments.
	By using derivative financial instruments to economically hedge exposures to changes in interest rates, the Partnership exposes itself to credit risk and market risk. Derivative instruments that economically hedge exposures are used for risk management purposes, but these instruments are not designated as hedges for accounting purposes. Credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is positive, the counterparty owes the Partnership, which creates credit risk for the Partnership. When the fair value of a derivative contract is negative, the Partnership owes the counterparty and, therefore, the Partnership is not exposed to the counterparty’s credit risk in those circumstances. The Partnership minimizes counterparty credit risk in derivative instruments by entering into transactions with major banking and financial institutions. The derivative instruments entered into by the Partnership do not contain credit risk related contingent features.
	Market risk is the adverse effect on the value of a derivative instrument that results from a change in interest rates, currency exchange rates, or commodity prices. The market risk associated with interest rate contracts is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken.
	The Partnership assesses interest rate risk by monitoring changes in interest rate exposures that may adversely impact expected future cash flows and by evaluating economical hedging opportunities.
	The Partnership has historically used variable interest rate mortgage debt to finance its vessel construction or conversions. The variable interest rate mortgage debt obligations expose the Partnership to variability in interest payments due to changes in interest rates. The Partnership believed that it was prudent to limit the variability of a portion of its interest payments. To meet this objective, the Partnership entered into London Interbank Offered Rate (“LIBOR”) based interest rate swap contracts to manage fluctuations in cash flow resulting from changes in the benchmark interest rate of LIBOR. These swaps change the variable rate cash flow exposure on the mortgage debt obligations to fixed cash flows. Under the terms of the interest rate swaps, the Partnership received LIBOR based variable interest rate payments and makes fixed interest rate payments, thereby creating the equivalent of fixed rate debt for the notional amount of its debt hedged.
	All interest rate swaps entered into in conjunction with the individual vessel financings prior to the IPO, were carved out as they were readily separable and identifiable within the books of KNOT, and all these interest rate swap agreements were retained by KNOT and were not transferred to the Partnership and therefore were eliminated from the Partnership’s opening equity position as of April 16, 2013. See Unaudited Condensed Consolidated and Combined Carve-Out Statements of Changes in Partners’ Capital / Owner’s Capital and Note 2 (a) – Summary of Significant Accounting Policies: Basis of Preparation.
	As of June 30, 2014, the Partnership has entered into various interest rate swap agreements effective until March, April, May, July and August, 2018, for a total notional amount of $350.0 million to hedge against the interest rate risks of its variable-rate borrowings. This includes the interest rates swap agreements of the newly acquired companies owning the Hilda Knutsen and the Torill Knutsen that were transferred to the Partnership in June 2014 in connection with the acquisition of the companies that own such vessels. See Note 13 – Business Acquisitions. Under the terms of the interest rate swap agreements, the Partnership will receive from the counterparty interest on the notional amount based on three-month LIBOR and will pay to the counterparty a fixed rate. For the interest rate swap agreements above, the Partnership will pay to the counterparty a fixed rate ranging from 1.25% to 1.46%.
	As of June 30, 2014 and December 31, 2013, the total notional amount of the Partnership’s outstanding interest rate swap contracts that were entered into in order to hedge outstanding or forecasted debt obligations were $350.0 million and $200.0 million, respectively. As of June 30, 2014 the carrying amounts of the interest rate swaps contracts were net liabilities of $1.2 million and December 31, 2013, the carrying amounts of the interest rate swaps contracts were net assets of $0.5 million. See Note 7 – Fair Value Measurements.
	Changes in the fair value of interest rate swaps are reported in realized and unrealized loss on derivative instruments in the same period in which the related interest affects earnings.
	The Partnership and its subsidiaries utilize the U.S. Dollar as their functional and reporting currency, because all of their revenues and the majority of their expenditures, including the majority of their investments in vessels and their financing transactions, are denominated in U.S. Dollars. The Partnership’s Predecessor for accounting purposes (the “Predecessor”) has also from time to time contracted vessels with contractual obligations to pay the yards in currencies other than the U.S. Dollar. Payment obligations in currencies other than the U.S. Dollar, and in particular operating expenses in NOK, expose the Partnership to variability in currency exchange rates. The Partnership believes that it is prudent to limit the variability of a portion of its currency exchange exposure. To meet this objective, the Partnership from time to time has entered into foreign exchange forward contracts to manage fluctuations in cash flows resulting from changes in the exchange rates towards the U.S. Dollar. The agreements change the variable exchange rate to fixed exchange rates at agreed dates.
	As of June 30, 2014 and December 31, 2013 the total contract amount in foreign currency of the Partnership’s outstanding foreign exchange forward contracts that were entered into to economically hedge outstanding future payments in currencies other than the U.S. Dollar were zero (no contracts) and NOK 124.4 million, respectively. As of June 30, 2014 and December 31, 2013, the carrying amount of the Partnership’s foreign exchange forward contracts was an asset of $nil and $0.2 million, respectively. See Note 7 – Fair Value Measurements.
	The following table presents the realized and unrealized gains and losses that are recognized in earnings as net gain (loss) on derivative instruments for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
	(US $ in thousands)	2014			2013			2014			2013
	Realized gain (loss)
	Interest rate swap contracts		(700	)		—			(1,254	)		(1,116	)
	Foreign exchange forward contracts		—			—			500			—
	Unrealized gain (loss)
	Interest rate swap contracts		(1,642	)		(434	)		(1,294	)		1,029
	Foreign exchange forward contracts		—			—			(248	)		—
	Total		(2,342	)		(434	)		(2,296	)		(87	)

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	7) Fair Value Measurements
	(a) Fair Value of Financial Instruments
	The following table presents the carrying amounts and estimated fair values of the Partnership’s financial instruments as of June 30, 2014 and December 31, 2013. Fair value is defined as the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
			June 30, 2014				December 31, 2013
	(US $ in thousands)		Carrying		Fair Value		Carrying		Fair Value
			Amount				Amount
	Financial assets:
	Cash and cash equivalents			34,451		34,451		28,836		28,836
	Restricted cash			691		691		458		458
	Current derivative asssets:
	Interest rate swap contracts			—		—		—		—
	Foreign exchange forward contract			—		—		248		248
	Non-current derivative asset:
	Interest rate swap contracts			2,561		2,561		2,617		2,617
	Financial liabilities:
	Current derivative liabilities:
	Interest rate swap contracts			3,710		3,710		2,124		2,124
	Foreign exchange forward contract			—		—		—		—
	Non-current derivative liabilities:
	Interest rate swap contracts			—		—		—		—
	Long-term debt, current and non-current			545,774		547,890		349,977		350,999
	The carrying amounts shown in the table above are included in the unaudited condensed consolidated and combined carve-out balance sheets under the indicated captions. The carrying values of trade accounts receivable, trade accounts payable and receivables/payables to owners and affiliates approximate their fair value.
	The fair values of the financial instruments shown in the above table as of June 30, 2014 and December 31, 2013 represent the amounts that would be received to sell those assets or that would be paid to transfer those liabilities in an orderly transaction between market participants at that date. Those fair value measurements maximize the use of observable inputs. However, in situations where there is little, if any, market activity for the asset or liability at the measurement date, the fair value measurement reflects the Partnership’s own judgment about the assumptions that market participants would use in pricing the asset or liability. Those judgments are developed by the Partnership based on the best information available in the circumstances, including expected cash flows and appropriately risk-adjusted discount rates, available observable and unobservable inputs.
	The following methods and assumptions were used to estimate the fair value of each class of financial instruments:
		•		Cash and cash equivalents and restricted cash: The fair value of the Partnership’s cash balances approximates the carrying amounts due to the current nature of the amounts.
		•		Foreign exchange forward contracts: The fair value is calculated using mid-rates (excluding margins) as determined by counterparties based on available market rates as of the balance sheet date. The fair value is discounted from the value at expiration to the current value of the contracts.
		•		Interest rate swap contracts: The fair value of interest-rate swaps is determined using an income approach using the following significant inputs: the term of the swap, the notional amount of the swap, discount rates interpolated based on relevant LIBOR swap curves and the rate on the fixed leg of the swap.
		•		Long-term debt: With respect to long-term debt measurements, the Partnership uses market interest rates and adjusts that rate for all necessary risks, including its own credit risk. In determining an appropriate spread to reflect its credit standing, the Partnership considered interest rates currently offered to the KNOT Group for similar debt instruments of comparable maturities by KNOT’s and the Partnership’s bankers as well as other banks that regularly compete to provide financing to the Partnership.
	(b) Fair Value Hierarchy
	The following table presents the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis (including items that are required to be measured at fair value or for which fair value is required to be disclosed) as of June 30, 2014 and December 31, 2013:
					Fair Value Measurements at
					Reporting Date Using
	(US $ in thousands)		June 30,		Quoted Price		Significant		Significant
			2014		in Active		Other		Unobservable
					Markets for		Observable		Inputs
					Identical		Inputs		(Level 3)
					assets		(Level 2)
					(Level 1)
	Financial assets:
	Cash and cash equivalents			34,451		34,451		—		—
	Restricted cash			691		691		—		—
	Current derivative assets:
	Foreign exchange forward contract			—		—		—		—
	Non-current derivative assets:
	Interest rate swap contracts			2,561		—		2,561		—
	Financial liabilities:
	Current derivative liabilities:
	Interest rate swap contracts			3,710		—		3,710		—
	Foreign exchange foward contracts			—				—		—
	Non-current derivative liabilities:
	Interest rate swap contracts			—		—		—		—
	Long-term debt, current and non-current			547,890		—		547,890		—
					Fair Value Measurements at
					Reporting Date Using
	(US $ in thousands)		December 31,		Quoted Price		Significant		Significant
			2013		in Active		Other		Unobservable
					Markets for		Observable		Inputs
					Identical		Inputs		(Level 3)
					assets		(Level 2)
					(Level 1)
	Financial assets:
	Cash and cash equivalents			28,836		28,836		—		—
	Restricted cash			458		458		—		—
Current derivative assets:
Foreign exchange forward contract			248		—		248		—
Non-current derivative assets:
Interest rate swap contracts			2,617		—		2,617		—
Financial liabilities:
Current derivative liabilities:
Interest rate swap contracts			2,124		—		2,124		—
Foreign exchange foward contracts			—				—		—
Non-current derivative liabilities:
Interest rate swap contracts			—		—		—		—
Long-term debt, current and non-current			350,999		—		350,999		—
The Partnership’s accounting policy is to recognize transfers between levels of the fair value hierarchy on the date of the event or change in circumstances that caused the transfer. There were no transfers into or out of Level 1, Level 2 or Level 3 as of June 30, 2014 and December 31, 2013.

Longterm_Debt

Long-term Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Long-term Debt	'
	8) Long-term Debt
	As of June 30, 2014 and December 31, 2013, the Partnership had the following debt amounts outstanding:
	(US $ in thousands)		Vessel		June 30,		December 31,
					2014		2013
	$160 million Loan facility		Fortaleza Knutsen & Recife Knutsen			126,163		132,425
	$220 million Loan facility		Windsor Knutsen, Bodil Knutsen,			220,000		—
			Carmen Knutsen
	$20 million Revolver Credit facility		Windsor Knutsen, Bodil Knutsen,			20,000		—
			Carmen Knutsen
	$120 million Loan facility		Bodil Knutsen			—		67,615
	$85 million Loan facility		Windsor Knutsen			—		52,400
	$93 million Loan facility		Carmen Knutsen			—		87,188
	$117 million Loan facility		Hilda Knutsen			89,187		—
	$117 million Loan facility		Torill Knutsen			90,424		—
	Seller’s credit					—		10,349
	Total long-term debt					545,774		349,977
	Less current installments					38,781		29,269
	Less seller’s credit					—		10,349
	Long-term debt, excluding current installment and seller’s credit				$	506,993	$	310,359
	The total outstanding debt as of June 30, 2014 is repayable as follows:
	(US $ in thousands)
	2014		$	19,272
	2015			39,268
	2016			131,543
	2017			25,568
	2018			160,837
	2019			169,286
	Total		$	545,774
	In June 2014, the Partnership entered into two new senior secured credit facilities in order to refinance its existing long term bank debt. The senior secured credit facilities consist of $380 million including a $20 million revolving tranche, a $220 million term loan facility and a $140 term loan. The $240 million facility was drawn in June 2014 to repay existing debt under the $120 million loan facility, the $85 million loan facility and the $93 million loan facility secured by the Bodil Knutsen, Windsor Knutsen and Carmen Knutsen, respectively, and the seller credit from KNOT. The drawing of the new $140 million facility is expected to occur within the fourth quarter of 2014 and will replace the $160 million Loan Facility secured by the Fortaleza Knutsen and Recife Knutsen.
	$240 Million Secured Loan Facility
	In June 2014, Partnership subsidiaries KNOT Shuttle Tankers 18 AS, KNOT Shuttle Tankers 17 AS and Knutsen Shuttle Tankers 13 AS entered into a senior secured term loan in a total aggregate amount of $240 million (the “Senior Secured Loan Facility”). The Senior Loan Facility consist of (i) $220 million term loan (the “Term Loan Facility”), and (ii) $20 million revolving credit facility (the “Revolving Credit Facility”).
	The Revolving Credit Facility terminates in June 2019, bears interest at LIBOR plus a fixed margin of 2.125% and has a commitment fee equal to 40% of the margin of the Revolving Credit Facility calculated on the daily undrawn portion of the Revolving Credit Facility.
	The Term Loan Facility is repayable in quarterly instalments over five years with a final balloon payment due at maturity in June 2019. The Term Loan Facility bears interest at LIBOR plus a margin of 2.125%.
	The Senior Secured Loan Facility is guaranteed by the Partnership and KNOT Shuttle Tankers AS, and secured by vessels mortgages (the Windsor Knutsen, the Bodil Knutsen and the Carmen Knutsen).
	The Senior Secured Loan Facility contains the following financial covenants:
		•		The aggregate market value of the Windsor Knutsen, Bodil Knutsen and Carmen Knutsen shall not be less than 110% of the outstanding balance under the Senior Secured Loan Facility for the first two years, 120% until the fourth year, and 125% after the fifth year;
		•		Positive working capital for the borrower and the Partnership;
		•		Minimum liquidity of the Partnership of $15 million plus increments of $1 million for each additional vessel acquired by the Partnership above the eighth vessel and $1.5 million for each owned vessel with less than 12 months remaining tenor on its employment contract;
		•		Minimum book equity ratio for the Partnership of 30%; and
		•		Minimum EBITDA to interest ratio for the Partnership of 2.50.
	The Senior Secured Loan Facility also identifies various events that may trigger mandatory reduction, prepayment and cancellation of the facility, including total loss or sale of a vessel and customary events of default.
	$160 Million Secured Loan Facility
	The $160 million secured loan facility (the “Fortaleza and Recife Facility”), includes two tranches. Each tranche is repayable in quarterly installments over five years with final balloon payments due at maturity in March 2016 and August 2016. The Fortaleza and Recife Facility bears interest at LIBOR plus a fixed margin of 3.0%. The Fortaleza and Recife Facility is secured by the Fortaleza Knutsen and the Recife Knutsen, and the Partnership and KNOT Shuttle Tankers AS are the sole guarantors. It also contains the following financial covenants:
		•		Market value of the Fortaleza Knutsen and Recife Knutsen shall not be less than 100% of the outstanding balance under the Fortaleza and Recife Facility;
		•		Positive working capital for the borrower;
		•		Minimum liquidity of the Partnership of $15 million plus increments of $1 million for each additional vessel acquired by the Partnership above the eighth vessel and $1.5 million for each owned vessel with less than 12 months remaining tenor on its employment contract;
		•		Minimum book equity ratio for the Partnership of 30%; and
		•		Minimum EBITDA to interest ratio for the Partnership of 2.50.
	The Fortaleza and Recife Facility also identifies various events that may trigger mandatory reduction, prepayment and cancellation of the facility, including total loss or sale of a vessel and customary events of default.
	$117 Million Loan facility
	The $117 million secured loan facility (the “Hilda Facility”) is repayable in quarterly installments over five years with a final balloon payment due at maturity in July 2018. The Hilda Facility bears interest at LIBOR plus a fixed margin of 2.5%. The Hilda Knutsen, assignments of earnings, charterparty contracts and insurance proceeds are pledged as collateral for the Hilda Facility. The Partnership and KNOT Shuttle Tankers AS are the sole guarantor. The Hilda Facility contains the following financial covenants:
		•		Market value of the Hilda Knutsen shall not be less than 110% of the outstanding balance under the Hilda Facility for the first 2 years, 120% until the fourth year, and 125% after the fifth year;
		•		Positive working capital of the borrower and the Partnership;
		•		Minimum liquidity of the Partnership of $15 million plus increments of $1 million for each additional vessel acquired by the Partnership above the eighth vessel and $1.5 million for each owned vessel with less than 12 months remaining tenor on its employment contract;
		•		Minimum book equity ratio for the Partnership of 30%; and
		•		Minimum EBITDA to interest ratio for the Partnership of 2.50.
	The Hilda Facility also identifies various events that may trigger mandatory reduction, prepayment and cancellation of the facility, including total loss or sale of a vessel and customary events of default.
	$117 Million Loan facility
	The $117 million secured loan facility (the “Torill Facility”) is repayable in quarterly installments over five years with a final balloon payment due at maturity in October 2018. The Torill Facility bears interest at LIBOR plus a fixed margin of 2.5%. The Torill Knutsen, assignments of earnings, charterparty contracts and insurance proceeds are pledged as collateral for the Hilda Facility. The Partnership and KNOT Shuttle Tankers AS are the sole guarantor. The Torill Facility contains the following financial covenants:
		•		Market value of the Torill Knutsen shall not be less than 110% of the outstanding balance under the Torill Facility for the first 2 years, 120% until the fourth year, and 125% after the fifth year;
		•		Positive working capital of the borrower and the Partnership;
		•		Minimum liquidity of the Partnership of $15 million plus increments of $1 million for each additional vessel acquired by the Partnership above the eighth vessel and $1.5 million for each owned vessel with less than 12 months remaining tenor on its employment contract;
		•		Minimum book equity ratio for the Partnership of 30%; and
	•		Minimum EBITDA to interest ratio for the Partnership of 2.50.
The Torill Facility also identifies various events that may trigger mandatory reduction, prepayment and cancellation of the facility, including total loss or sale of a vessel and customary events of default.
$120 Million Secured Loan Facility
The $120 million secured loan facility (the “Bodil Facility”) was repaid in full in June 2014 with the proceeds from the $240 Million Secured Loan Facility refinancing noted above.
$85 Million Secured Loan Facility
The $85 million secured loan facility (the “Windsor Facility”) was repaid in full in June 2014 with the proceeds from the $240 Million Secured Loan Facility refinancing noted above.
$93 Million Secured Loan Facility
The $93 million secured loan facility (the “Carmen Facility”) was repaid in full in June 2014 with the proceeds from the $240 Million Secured Loan Facility refinancing noted above.
$10.5 Million Seller’s Credit
As part of the financing of the purchase of Carmen Knutsen, KNOT provided a Seller Loan. This loan was repaid in full in June 2014, with the proceeds from the $240 Million Secured Loan Facility refinancing noted above.
The Partnership was in compliance with all loan covenants as of June 30, 2014 and December 31, 2013.
The LIBOR interest rates for the individual loans do not include the effect of the Partnership’s interest rate swaps. See Note 6 – Derivative Instruments and Note 7 – Fair Value Measurements.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	9) Income Taxes
	Components of Current and Deferred Tax Expense (Benefit)
	After the reorganization of the Predecessor’s activities into the new group structure in February 2013, all profit from continuing operations in Norway is taxable within the Norwegian Tonnage Tax regime (“the tonnage tax regime”). The consequence of the reorganization was a one-time entrance tax into the Norwegian tonnage tax regime due to the Partnership’s acquisition of the shares in the subsidiary that owns the Fortaleza Knutsen and the Recife Knutsen. Under the tonnage tax regime, the tax is based on the tonnage of the vessel and operating income is tax free. The net financial income and expense remains taxable as ordinary income tax for entities subject to the tonnage tax regime. For the portion of activities subject to the tonnage tax regime, tonnage taxes are classified as vessel operating expenses while the current and deferred taxes arising on net financial income and expense are reflected as income tax expense in the consolidated and combined carve-out financial statements.
	Total amount of the entrance tax was estimated to be approximately $3.0 million, which was recognized in the three months ended March 31, 2013. The entrance tax on this gain is payable over several years and is calculated by multiplying the tax rate of 28% by the declining balance of the gain, which will decline by 20% each year. As of December 31, 2013, the entrance tax declined to approximately $2.7 million compared to the effect on the time of the reorganization due to translation effects and tax rate changes. The tax payable in 2014 will be calculated by multiplying the tax basis with 28%. The deferred tax liabilities are calculated based on a tax rate of 27%. Approximately $0.6 million of the estimated entrance tax of $2.7 million has been paid in the second quarter of 2014, while $2.1 million is presented as non-current deferred taxes payable. Taxes payable as of June 30, 2014 consist of ordinary tonnage tax payable from continuing operations of $ 0.2 million in 2013 and an estimate of approximately $1,000 for the six months ended June 30, 2014, and which result in total taxes payable of approximately $0.2 million. The changes in the current and the deferred taxes from year end 2013 consist of currency effects and estimated tax from net financial income from the six months ended June 30, 2014. Currency effects on taxes settled in Norwegian kroner, but not paid as of June 30, 2014, is recognized and included in net gain (loss) on foreign currency transactions in the six months period ended June 30, 2014.
	Profit and loss from continuing operations before income taxes was taxable to Norway and the significant components of current and deferred income tax expense (benefit) attributable to income from continuing operations for the six months ended June 30, 2014 and 2013 are as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
	(US $ in thousands)	2014			2013			2014			2013
	Income before income taxes		2,479			3,971			8,921			3,747
	Income tax benefit (expense)		18			—			(1	)		(2,942	)
	Effective tax rate		0	%		0	%		0	%		79	%
	The tax for three months and six months ended June 30, 2013 is calculated in a carve-out situation based on taxable income in Norwegian kroner for the ordinary taxed Predecessor’s activities prior to the IPO, and these taxes are not transferred to the Partnership. For the six months ended June 30, 2013 approximately $3.0 million is included reflecting the one-time entrance tax payable in NOK. As a consequence of the reorganization prior to the IPO, all entities within Norwegian Tax Jurisdiction are now taxable under the Norwegian tonnage tax regime for net financial items.
	A valuation allowance for deferred tax assets is recorded when it is more likely than not that some of or all of the benefit from the deferred tax asset will not be realized. The valuation allowances relate to the financial loss carry forwards and other deferred tax assets for tonnage tax that, in the judgment of the Partnership, are more-likely-than not to be realized reflecting the Partnership’s cumulative loss position for tonnage tax. In assessing the realizability of deferred tax assets, the Partnership considers whether it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized taking into account all the positive and negative evidence available, and there is no deferred tax assets recognized as of June 30, 2014 and December 31, 2013.

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	10) Related Party Transactions
	(a) Related Parties
	Historically, the Combined Entity operated as an integrated part of KNOT. KNOT is owned 50% by TSSI and 50% by NYK. TSSI also controls 99% of KOAS, which subcontracts services from Knutsen OAS Management AS, which served as the vessel management companies for KNOT and its subsidiaries until June 30, 2012. As of July 1, 2012, KNOT Management AS, a 100% owned subsidiary of KNOT, assumed responsibility for the commercial and technical management of the Vessels.
	The Partnership has been charged by KNOT, KOAS and TSSI for commercial services related to the charters, technical and operational support related to the operation of the Vessels, certain administrative costs and finance fees. Consequently, for the periods prior to April 16, 2013, for the purpose of the Consolidated and Combined Entity’s statements of operations these costs and fees include allocations as described above and in Note 2 (a) – Summary of Significant Accounting Policies: Basis of Preparation.
	On February 18, 2013, the Partnership terminated the Commercial Management Agreements that existed between KNOT Management and the owners of the Windsor Knutsen and the Bodil Knutsen, and on March 20, 2013, the Partnership terminated the Commercial Management Agreements that existed between KNOT Management and the owner of the Fortaleza Knutsen and the Recife Knutsen. In consideration for the termination of the Commercial Management Agreement a cancellation fee was paid for each Vessel equal to the remuneration to be paid in accordance with the Commercial Management Agreement until the expiration of the time charter and bareboat parties for each Vessel. The cancellation fees have been charged to the Consolidated and Combined Entity’s statement of operations as described in Note 2 (a) – Summary of Significant Accounting Policies: Basis of Preparation. The existing technical management agreements were amended. These agreements govern the crew, technical and commercial management of the vessels. The Windsor Knutsen and the Bodil Knutsen, which operate under time charters, is subject to amended technical management agreements pursuant to which certain crew, technical and commercial management services are provided by KNOT Management. Under these amended technical management agreements, the Partnership’s subsidiaries pay fees to and reimburse the costs and expenses of KNOT Management. The Fortaleza Knutsen and the Recife Knutsen operate under bareboat charters and, as a result, the customer is responsible for providing the crew, technical and commercial management of the vessel.
	On March 25, 2013, the Partnership entered into an administrative services agreement with KNOT UK, pursuant to which KNOT UK provides administrative services, and KNOT UK is permitted to subcontract certain of the administrative services provided under the administrative services agreement to KOAS UK and KOAS. Certain of the services intended to be provided to the Partnership by KOAS have been performed by KNOT under the same terms as the services provide to the Partnership by KOAS.
	The amounts of such costs and expenses included in the condensed consolidated and combined carve-out statements of operations as for the three and six months ended June 30, 2014 and 2013 are as follows:
			Three Months Ended				Six Months Ended
			June 30,				June 30,
	(US $ in thousands)		2014		2013		2014		2013
	Statements of operations:
	Time charter and bareboat revenues:
	Commercial commission fee from KNOT to Vessels (1)			—		—		—		95
	Cancellation fee from KNOT to Vessels (2)			—		—		—		3,448
	Operating expenses:
	Technical and operational management fee from KNOT to Vessels (3)			329		234		658		460
	General and administrative expenses:
	Administration fee from KNOT (4)			24		318		207		424
	Administration fee from KOAS (4)			123		—		230		—
	Administration fee from KOAS UK (4)			37		—		74		—
	Accounting service fee from KNOT (5)			126		—		151		—
	IPO administration cost from KNOT to subsidiaries (6)			—		60		—		455
	Finance income (expense):
	Financing service fee from KNOT to Vessels (7)			50		—		50		—
	Interest expense charged from KNOT (8)			124		1		252		90
	Guarantee commission from TSSI to Vessels (9)			—		30		—		210
	Guarantee commission from KNOT to Vessels (9)			—		31		—		425
	Total			813		674		1,622		5,607
	1)	Commercial commission fee from KNOT to Vessels: KNOT provides commercial services related to negotiating and maintaining the charters. KNOT invoices a fixed percentage of revenue as a commercial commission for these services.
	2)	Cancellation fee from KNOT to Vessels: In consideration for the termination of the Commercial Management Agreement a cancellation fee was agreed for each Vessel equal to the remuneration to be paid in accordance with the Commercial Management Agreement until the expire of the charter parties for each of the Vessels. As the cancellation fee relates to the commercial commission, it has been presented with operating income, consistent with the presentation of commissions.
	3)	Technical and operational management fee from KOAS and KNOT to Vessels: KOAS and KNOT provide technical and operational management of the vessels on time charter including crewing, purchasing, maintenance and other operational, bookkeeping and administrative support. For bareboat charters, KOAS provides bookkeeping and administrative support. KOAS invoices a fixed amount per day per vessel based upon providing either time charter or bareboat services. In addition, there is also a charge for 24 hour emergency response services provided by KOAS for all vessels managed by KOAS and KNOT. The direct cost for the response services has been allocated to all vessels without a mark-up based upon the number of vessels in managed by KOAS and KNOT.
	4)	Administration fee from KNOT, KOAS and KOAS UK: Administration costs include the compensation and benefits of KNOT management and administrative staff as well as other general and administration expenses. Net administration costs are total administration cost plus a 5% margin, reduced for the total fees for services delivered by the administration staffs (the accounting service fees (see (5) below), and the estimated shareholder costs for KNOT that have not been allocated. As such, the level of net administration costs as a basis for the allocation can vary from year to year based on the administration and financing services offered by KNOT to all the vessels in its fleet each year.
	5)	Accounting service fee from KNOT : KNOT invoiced each subsidiary a fixed fee for the preparation of the statutory financial statements (including Knutsen Shuttle Tankers XII KS, which owns the Recife Knutsen and the Fortaleza Knutsen, Knutsen Shuttle Tankers XII AS and KNOT Shuttle Tankers 12 AS). Such charges were allocated to the Bodil Knutsen and the Windsor Knutsen based on the number of vessels in the legal entity until the Bodil Knutsen and Windsor Knutsen were sold to KNOT Shuttle Tankers 17 AS and KNOT Shuttle Tankers 18 AS as part of the reorganization prior to the IPO.
	6)	IPO administration cost from KNOT: In connection with the preparation of the financial statements and the Partnership’s Registration statement for the IPO, KNOT has invoiced actual cost for internal resources, including salaries and administration cost, plus a 5% margin. Since the costs were not incremental cost directly attributable to the IPO, they were expensed as incurred.
	7)	Financing service fee from KNOT to Vessels: KNOT invoiced each vessel for a fixed amount in relation to new loan facilities for vessel financing as compensation for the time and cost of loan negotiations with external banks.
	8)	Interest expense charged from, interest income charged to KNOT/TSSI: KNOT/TSSI invoiced interest expense (income) for any outstanding payables to (receivable from) owners and affiliates to the vessel-owning subsidiaries (including Knutsen Shuttle Tankers XII KS, which owns the Recife Knutsen and the Fortaleza Knutsen, Knutsen Shuttle Tankers XII AS and KNOT Shuttle Tankers 12 AS). Since payables to (receivables from) owners and affiliates are not tracked by vessel, balances based upon payments by owners to the shipyard have been allocated to the Bodil Knutsen and the Windsor Knutsen. See Note 2(a) – Summary of Significant Accounting Policies: Basis of Preparation for a description of the allocation principles applied. Interest expense has been allocated based upon the allocated payables to owners and affiliates and the historical interest rates charged.
	9)	Guarantee commission from TSSI/KNOT to Vessels: TSSI and KNOT were guarantors for the Predecessor’s loan facilities (see (b) Guarantees below). TSSI and KNOT invoiced an annual commission to each of the Vessels as a fixed percentage of the outstanding balance as compensation for the guarantee.
	(b) Guarantees
	Pursuant to the Omnibus Agreement, KNOT agreed to guarantee the payments of the hire rate under the existing charters of each of the Bodil Knutsen and the Windsor Knutsen for a period of five years from the closing date of the IPO. The Partnership will not incur any guarantee commissions in the future relating to such guarantees.
	The Partnership was notified that BG Group will not exercise its option to extend the Windsor Knutsen time charter after the expiration of its initial term. The vessel was re-delivered on July 28, 2014. In order to comply with its obligations under the omnibus agreement KNOT and the Partnership, on July 29, 2014 KNOT entered into a time charter for the vessel at a rate of hire that would have been in effect during the option period under the previous BG Group time charter. This charter will be effective until the new BG Group time charter described below commences in the fourth quarter of 2015.
	In June 2014, the Partnership entered into a new time charter with a subsidiary of the BG Group for the Windsor Knutsen. The hire rate for the initial term of the new charter is in line with the rate in the previous charter. The new charter has an initial term of two years. BG Group has options to extend the term of the new charter for three additional one-year periods. The new charter will commence in the fourth quarter of 2015. If all three extension options are exercised, the Windsor Knutsen will operate for BG Group until the end of 2020.
	Prior to the IPO, the Partnership entered into amended financing agreements with various lenders. The majority of the Partnership’s original external vessel financing agreements have been guaranteed by either KNOT or TSSI for which a guarantee commission was paid. Following the completion of the IPO and the amendments to the vessel financing agreements, the Partnership guarantees the obligations of the Partnership’s subsidiaries directly under the vessel financing agreements. Therefore, the Partnership will not incur any guarantee commissions to KNOT and TSSI on a going forward basis.
	(c) Transactions with Management and Directors
	See Note 10(a) Related parties (above) for a discussion of the allocation principles for KNOT’s administrative costs, including management and administrative staff, included in the consolidated and combined carve-out statements of operations.
	In connection with the IPO, KNOT UK entered into an employment agreement with Arild Vik dated March 28, 2013 and effective on April 28, 2013. Arild Vik serves as KNOT UK’s Chief Executive Officer and Chief Financial Officer. His annualized base salary is 200,000 British Pounds. In addition, the employment agreement also provides for a discretionary annual bonus (as determined by the board of directors of KNOT UK), the reimbursement of relocation expenses to the United Kingdom (up to a maximum of 30,000 British Pounds), payment by KNOT UK of housing costs in London, participation in other employment benefits in which other senior executives of KNOT UK participate, 60 working days of paid vacation per year (plus public holidays), and up to 13 weeks of paid sick leave per year. An accrual of $47,000 has been made to cover insurance and pension expenses for Mr. Vik as of June 30, 2014.
	Non-management directors will each receive a director fee of $40,000 per year. Members of the audit and conflicts committees will each receive a committee fee of $5,000 per year.
	(d) Amounts due from (to) related parties
	Balances with related parties consisted of the following:
	(US $ in thousands)		At June 30,		At December 31,
			2014		2013
	Balance Sheets:
	Trading balances due from KOAS			19		27
	Trading balances due from KNOT and affiliates			25		50
	Amount due from related parties			44		77
	Trading balances due to KOAS			265		141
	Trading balances due to KNOT and affiliates			3,253		22
	Amount due to related parties			3,518		163
	Amounts due from (to) related parties are unsecured, and intended to be settled in the ordinary course of business. They primarily relate to vessel management and other fees due to KNOT and KOAS.
	(e) Trade accounts payables
	Balances with trade accounts payables to related parties consisted of the following:
	(US $ in thousands)		At June 30,		At December 31,
			2014		2013
	Balance Sheets:
Trading balances due to KOAS			334		498
Trading balances due to KNOT and affiliates			195		271
Trading balances due to NYK			6		—
Trade accounts payables to related parties			535		769
(f) Acquisitions from KNOT
On August 1, 2013, the Partnership acquired KNOT’s 100% interests in Knutsen Shuttle Tankers 13 AS, a company that owns and operates the Carmen Knutsen. As part of the financing for the acquisition, KNOT provided a Sellers’s credit in the form of a $10.5 million loan. The Seller Loan is non-amortizing and matures in August 2018 or earlier if the parties agree. The Seller Loan bears interest at LIBOR plus a margin of 4.5%. The Partnership was the sole guarantor. The Seller Loan constitutes senior debt obligation of the borrower and has priority over any shareholder’s loan and equity provided by the owner. The Seller Loan contains customary provisions in case of non-payment or the borrower entering bankruptcy proceedings and carries a default interest of 8% per annum plus LIBOR. The Seller Loan was reduced by $0.1 million as settlement for the working capital in Knutsen Shuttle Tankers 13 AS. The Sellers’s Loan, including accrued interest, was paid in full in June 2014; see Note 8 – Long-Term Debt. The acquisition of Carmen Knutsen was accounted for as a business combination.
On June 30, 2014, the Partnership acquired KNOT’s 100% interests in Knutsen Shuttle Tankers 14 AS, a company that owns and operates the Hilda Knutsen, and Knutsen Shuttle Tankers 15 AS, a company that owns and operates the Torill Knutsen. The acquisitions of Hilda Knutsen and Torill Knutsen were accounted for as business combinations. See Note – 13 Business Acquisitions.
The board of directors of the Partnership (“the Board”) and the conflicts committee of the Board (“the Conflicts Committee”) approved the purchase price for each transaction described above. The Conflicts Committee retained a financial advisor to assist with its evaluation of the transactions.
Carmen Knutsen, Hilda Knutsen and Torill Knutsen have entered into technical and operational management agreements which are similar to those entered into by the Partnership’s other vessels.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	11) Commitments and Contingencies
	Assets pledged
	As of June 30, 2014 and December 31, 2013, Vessels with a book value of $939 and $618 million, respectively, were pledged as security held as guarantee for the Partnership’s long-term debt and interest rate swap obligations. See Note 6 – Derivative Instruments and Note 8 – Long-Term Debt.
	Claims and Legal Proceedings
	In February 2014, the Bodil Knutsen sustained heavy weather damage to its bow. The damage was temporarily repaired and the cost for the temporary repairs of $0.3 million was recorded under operating expenses during the three months ended March 31, 2014, and the temporary repair has not been classified as a hull and machinery insurance claim as of June 30, 2014. A final repair is estimated to cost approximately $0.6 million and will be carried out during the scheduled dry-docking that will take place in 2016 and this will be a hull and machinery insurance claim.
	From time to time, the Partnership is involved in various claims and legal actions arising in the ordinary course of business. In the opinion of management, the ultimate disposition of the matters in which the Partnership is currently involved will not have a material adverse effect on the consolidated and combined carve-out financial position, results of operations or cash flows.
	Insurance
	The Partnership maintains insurance on all the Vessels to insure against marine and war risks, which include damage to or total loss of the Vessels, subject to deductible amounts which averages $0.150 million per Vessel, and loss of hire.
	Under the loss of hire policies, the insurer will pay a compensation for the lost hire rate agreed in respect of each Vessel for each day, in excess of a 14 deductible days, for the time that the Vessel is out of service as a result of damage, for a maximum of 180 days. In addition, the Partnership maintains protection and indemnity insurance, which covers third-party legal liabilities arising in connection with the Vessel’s activities, including, among other things, the injury or death of third-party persons, loss or damage to cargo, claims arising from collisions with other vessels and other damage to other third-party property, including pollution arising from oil or other substances. This insurance is unlimited, except for pollution, which is limited to $1 billion per vessel per incident. The protection and indemnity insurance is maintained through a protection and indemnity association, and as a member of the association, the Partnership may be required to pay amounts above budgeted premiums if the member claims exceed association reserves, subject to certain reinsured amounts. If the Partnership experiences multiple claims each with individual deductibles, losses due to risks that are not insured or claims for insured risks that are not paid, it could have a material adverse effect on the Partnership’s results of operations and financial condition.

Earnings_per_Unit_and_Cash_Dis

Earnings per Unit and Cash Distributions	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings per Unit and Cash Distributions	'
	12) Earnings per unit and cash distributions
	The calculations of basic and diluted earnings per unit are presented below:
	(US $ in thousands, except per unit data)		Three			April 15			Six
			Months Ended			to			Months Ended
			June 30,			June 30,			June 30, 2014
			2014			2013
	Post IPO net income attributable to the members of KNOT Offshore Partners LP		$	2,497		$	4,343		$	8,921
	Less: Distribution paid (2)			9,945			5,547			17,560
	Under (over) distributed earnings			(7,448	)		(1,204	)		(8,639	)
	Under (over) distributed earnings attributable to:
	Common unitholders			(4,788	)		—			(5,371	)
	Subordinated unitholders			(2,511	)		(1,204	)		(3,095	)
	General Partner			(149	)		—			(173	)
	Weighted average units outstanding (basic and diluted) (in thousands):
	Common unitholders			8,719			8,568			8,643
	Subordinated unitholders			8,568			8,568			8,568
	General Partner			353			350			351
	Earnings per unit (basic and diluted):
	Common unitholders		$	0.14		$	0.317		$	0.505
	Subordinated unitholders (3)			0.143			0.177			0.511
	General Partner			0.141			0.317			0.507
	Cash distributions declared and paid in the period per unit (4)			0.435			—			0.435
	Subsequent event: Cash distributions declared and paid per unit relating to the period (5)			0.435			0.317			0.435
	-1	Earnings per unit have been calculated in accordance with the cash distribution guidelines set forth in the Partnership’s First Amended and Restated Agreement of Limited Partnership (the “Partnership Agreement”).
	-2	This refers to distributions made or to be made in relation to the period irrespective of the declaration and payment dates and based on the numbers of units outstanding at the record date. This includes cash distributions to the IDR holders (Knutsen NYK Offshore Tankers AS) for the three months ended June 30, 2014 and 2013 of $0.01 million and $nil, respectively, and for the six months ended June 30, 2014 and 2013 of $0.02 million and $nil, respectively.
	-3	This includes the net income attributable to IDR holders. The IDRs generally may not be transferred until March 31, 2018. The net income attributable to IDRs for the three and six months ended June 30, 2014 is $0.01 million and $0.02 million, respectively. There was no net income attributable to IDRs for the period April 15 to June 30, 2013.
	-4	Refers to cash distribution declared and paid during the period.
	-5	Refers to cash distribution declared and paid subsequent to the period end.
	Earnings per unit information are given for the period from the date of the closing of the IPO (April 15, 2013). Earnings per unit has not been presented for any period prior to the IPO as the information is not comparable due to the change in the Partnership’s structure and the basis of preparation as described in Note 2 (a) – Summary of Significant Accounting Policies: Basis of Preparation.
	As of June 30, 2014, the Partnership’s total number of units outstanding representing limited partner interests, 59.4% were held by the public (in the form of 13,167,500 common units, representing 100% of the Partnership’s common units) and 38.6% were held by KNOT in the form of 8,567,500 subordinated units, representing 100% of the Partnership’s subordinated units). In addition, KNOT, through its ownership of the General Partner, held the 2% general partner interest (in the form of 443,571 general partner units).
	Earnings per unit is determined by dividing net income, after deducting the General Partner’s interest, by the weighted-average number of units outstanding during the applicable period.
	The General Partner’s, common unitholders’ and subordinated unit holders’ interest in net income are calculated as if all net income was distributed according to the terms of the Partnership’s First Amended and Restated Agreement of Limited Partnership (the “Partnership Agreement”), regardless of whether those earnings would or could be distributed. The Partnership Agreement does not provide for the distribution of net income; rather, it provides for the distribution of available cash, which is a contractually defined term that generally means all cash on hand at the end of each quarter less the amount of cash reserves established by the Partnership’s board of directors to provide for the proper conduct of the Partnership’s business, including reserves for maintenance and replacement capital expenditures and anticipated capital requirements. In addition, KNOT, as the initial holder of all incentive distribution rights, has the right, at the time when there are no subordinated units outstanding and it has received incentive distributions at the highest level to which it is entitled (48.0% for each of the prior four consecutive fiscal quarters, to reset the initial cash target distribution levels at higher levels based on the distribution at the time of the exercise of the reset election. Unlike available cash, net income is affected by non-cash items, such as depreciation and amortization, unrealized gains and losses on derivative instruments and unrealized foreign currency gains and losses.
	Under the Partnership Agreement, during the subordinated period, the common units will have the right to receive distributions of available cash from operating surplus in an amount equal to the minimum quarterly distributions of $0.375 per unit per quarter, plus arrearages in the payment of minimum quarterly distributions on the common units from prior quarters, before any distributions of available cash from operating surplus may be made on the subordinated units.
	The amount of the minimum quarterly distribution is $0.375 per unit or $1.50 per unit on an annualized basis and is made in the following manner, during the subordinated period:
		•		first, 98.0% to the common unitholders, pro rata, and 2.0% to the General Partner, until each outstanding common unit has received a minimum quarterly distribution of $0.375;
		•		second , 98.0% to the common unitholders, pro rata, and 2.0% to the General Partner, until each outstanding common unit has received an amount equal to any arrearages in payment of the minimum quarterly distribution on the common units for prior quarters during the subordination period; and
		•		third, 98.0% to the subordinated unitholders, pro rata, and 2.0% to the General Partner until each subordinated unit has received a minimum quarterly distribution of $0.375.
	In addition, KNOT currently holds all of the incentive distribution rights in the Partnership. Incentive distribution rights represent the rights to receive an increasing percentage of quarterly distributions of available cash from operating surplus after the minimum quarterly distribution and the target distribution levels have been achieved.
	If for any quarter:
		•		the Partnership has distributed available cash from operating surplus to the common and subordinated unitholders in an amount equal to the minimum quarterly distribution; and
		•		the Partnership has distributed available cash from operating surplus on outstanding common units in an amount necessary to eliminate any cumulative arrearages in payment of the minimum quarterly distribution;
	then, the Partnership will distribute any additional available cash from operating surplus for that quarter among the unitholders and the General Partners in the following manner:
		•		first , 98.0% to all unitholders, pro rata, and 2.0% to the General Partner, until each unitholder receives a total of $0.43125 per unit for that quarter (the “first target distribution”);
		•		second, 85.0% to all unitholders, pro rata, and 2.0% to the General Partners and 13.0% to the holders of the incentive distribution rights, pro rata, until each unitholder receives a total of $0.46875 per unit for that quarter (the “second target distribution”);
		•		third , 75.0% to all unitholders, pro rata, and 2.0% to the General Partners and 23.0% to the holders of the incentive distribution rights, pro rata, until each unitholder receives a total of $0.5625 per unit for that quarter (the “third target distribution”); and
		•		thereafter, 50.0% to all unitholders, pro rata, 2.0% to the General Partner and 48.0% to the holders of the incentive distribution rights, pro rata.
	In each case, the amount of the target distribution set forth above is exclusive of any distributions to common unitholders to eliminate any cumulative arrearages in payment of the minimum quarterly distribution. The percentage interests set forth above assume that the General Partner maintains its 2.0% general partner interest and that the Partnership does not issue additional classes of equity securities.

Business_Acquisitions

Business Acquisitions	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Acquisitions	'
	13) Business Acquisitions
	On June 30, 2014, the Partnership’s wholly owned subsidiary, KNOT Shuttle Tankers AS, acquired KNOT’s 100% interest in: (i) Knutsen Shuttle Tankers 14 AS, the company that owns and operates the Hilda Knutsen; and (ii) Knutsen Shuttle Tankers 15 AS, the company that owns and operates the Torill Knutsen (the “Acquisitions”). The purchase price of the Hilda Knutsen was $166.0 million, net of $109.6 million of outstanding indebtedness related to the vessel. The purchase price of the Torill Knutsen was $169.0 million, net of $112.1 million of outstanding indebtedness related to the vessel. The cash portion of the purchase prices was financed with proceeds from the Partnership’s public offering of 4,600,000 common units which closed on June 27, 2014. See Note 14 – Equity Offering. The purchase prices were subsequently adjusted by a working capital adjustment of $1.0 million which remains a related party liability as of June 30, 2014.
	Each of the Hilda Knutsen and the Torill Knutsen is operating in the North Sea under time charters with Eni Trading & Shipping S.p.A. (“Eni”). The charters commenced upon delivery of the Hilda Knutsen and the Torill Knutsen in the third quarter of 2013 and each will terminate five years after delivery. Eni has options to extend each of the charters for up to five one-year periods. In the case of the Torill Knutsen, Eni has the option, at any time before May 31, 2016, to extend the charter term to ten years in exchange for a reduction in the hire rate.
	The Partnership accounted for the acquisition of the Hilda Knutsen and Torill Knutsen as an acquisition of a business. The purchase price of the acquisition has been allocated to the identifiable assets acquired. The allocation of the purchase price to acquired identifiable assets was based on their estimated fair values at the date of acquisition. The fair values allocated to each class of identifiable assets of the Hilda Knutsen and Torill Knutsen and the difference between the purchase price and net asset acquired were calculated as follows:
	(US $ in thousands)		June 30, 2014
	Purchase consideration (1)					114,293
	Less: Fair value of net assets acquired:
	Vessel and equipment			335,000
	Cash			8,997
	Inventories			395
	Others current assets			1,939
	Amounts due from related parties			4
	Long-term debt			(221,812	)
	Other long-term liabilities			(4,774	)
	Derivatives liabilities			(348	)
	Trade accounts payable			(390	)
	Accrued expenses			(1,360	)
	Prepaid charter and deferred revenue			(1,487	)
	Amounts due to related parties			(2,338	)
	Sub total			113,826
	Difference between the purchase price and fair value of net assets acquired					467
	Goodwill					467
	Difference between the purchase price and allocated values					—
	The goodwill recognized in connection with the acquisitions of Hilda Knutsen and Torill Knutsen is attributable primarily to the organization, including structure, systems, skills and abilities.
	-1	The purchase consideration of $114.3 million comprises the following:
	(US $ in thousands)
	Cash consideration paid to KNOT			113,306
	Purchase price adjustments			987
	Total purchase consideration			114,293
	Revenue and profit contributions
	The table below shows comparative summarized consolidated pro forma financial information for the Partnership for the six months ended June 30, 2014, giving effect to the Partnership’s acquisition and financing of the Hilda Knutsen and Torill Knutsen as if it had taken place on January 1, 2014. Since the Hilda Knutsen and Torill Knutsen were delivered August 5, and November 4, 2013, respectively, there is no pro forma figure for six months ended June 30, 2013.
	(US $ in thousands, except per unit data)		Six Months Ended
			30-Jun-14
	Revenue			67,074
	Net income			16,096
	Included in the pro forma adjustments are depreciation related to the purchase price allocation performed on the acquired identifiable assets as if the acquisition had taken place on January 1, 2014. In addition, the pro forma includes adjustments to eliminate debt issuance costs and guarantee commissions paid to KNOT.

Equity_Offerings

Equity Offerings	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Equity Offerings	'
	14) Equity Offerings
	(US $ in thousands)		As of
			June 30,
			2014
	Gross proceeds received (1)			133,447
	Less: Underwriters’ discount			4,381
	Less: Offering expenses			315
	Net proceeds received			128,751
		-1	Includes General Partner’s 2% proportional capital contribution
	On June 27, 2014, the Partnership sold 4,600,000 common units, representing limited partner interests, in an underwritten public offering and granted the underwriters a 30-day option to purchase an additional 690,000 common units. In connection with the offering, the Partnership’s general partner contributed a total of $2.7 million in order to maintain its 2% general partner interest in the Partnership. The Partnership’s total net proceeds from the public offering and the related General Partner’s contribution were $128.8 million as of June 30, 2014. Following this offering, KNOT’s interest in the Partnerships (including the general partner’s interest) was diluted from 51% to 41%.
	In connection with the partial exercises by the underwriters of their option to purchase additional common units, on July 14, 2014 and July 24, 2014, the Partnership issued and sold 150,000 common units and 490,000 common units, respectively, and the General Partner made an additional $0.4 million aggregate capital contribution to the Partnership in order to maintain its 2% general partner interest in the Partnership.
	The Partnership used the net proceeds from the offering and related capital contribution by the general partner to fund the cash portion of the purchase prices of the Hilda Knutsen and the Torill Knutsen and for general partnership purposes.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	15) Subsequent Events
	The Partnership has evaluated subsequent events from the balance sheet date through September 26, 2014, the date at which the unaudited condensed consolidated and combined carve-out financial statements were available to be issued, and determined that there are no other items to disclose except as follows:
	In connection with the partial exercises by the underwriters of their option to purchase additional common units, on July 14, 2014 and July 24, 2014, the Partnership issued and sold 150,000 common units and 490,000 common units, respectively, and the General Partner made an additional $0.4 million aggregate capital contribution to the Partnership in order to maintain its 2% general partner interest in the Partnership.
	On August 14, 2014, the Partnership paid a quarterly cash distribution of $0.435 per unit with respect to the quarter ended June 30, 2014. This cash distribution amounted to $9.9 million.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Preparation	'
	(a) Basis of Preparation
	The accompanying unaudited condensed consolidated and combined carve-out financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for interim financial information. All intercompany balances and transactions are eliminated. The unaudited condensed consolidated and combined carve-out financial statements do not include all the disclosures and information required for a complete set of annual financial statements; and, therefore, these unaudited condensed consolidated and combined carve-out financial statements should be read in conjunction with the audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, which are included in the Partnership’s Annual Report on Form 20-F for the year ended December 31, 2013 (the “20-F”).
	As of April 16, 2013, the financial statements of the Partnership as a separate legal entity are presented on a consolidated basis. Prior to April 16, 2013, the results of operations, cash flow and balance sheet have been carved out of the consolidated financial statements of KNOT and therefore are presented on a combined carve-out basis. The Combined Entity’s historical combined financial statements include assets, liabilities, revenues, expenses and cash flows directly attributable to the Partnership’s interests in the Vessels. Accordingly, the historical condensed consolidated and combined carve-out interim financial statements prior to April 16, 2013 reflect allocations of certain expenses, including that of general and administrative expenses, mark-to-market valuations of interest rate swap derivatives, interest expense on related party payables, and net gain (loss) on foreign currency transactions. The basis for the allocations is described in Note 2 of the audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, included in the Partnership’s 20-F. These allocated costs have been accounted for as equity contribution in the condensed consolidated and combined carve-out balance sheets.
	Included in the Combined Entity’s equity prior to April 16, 2013, are amounts (net liabilities of $27.8 million) relating to certain assets and liabilities that were carved out as they were readily separable and identifiable within the books of KNOT. However, these amounts have been retained by KNOT and have not been transferred to the Partnership and therefore have been eliminated from the Partnership’s opening equity as of April 16, 2013. Details of the net liabilities eliminated are as follows:
	(US $ in thousands)
	Balance Sheet captions:
	Other current assets		89
	Other non-current assets		—
	Other current liabilities (*)		(6,321	)
	Other long-term liabilities (*)		(21,560	)
	Net Liabilities		(27,792	)
	(*)	The majority of the assets and liabilities not transferred to the Partnership are related to interest swap derivatives (note 6) and insurance proceeds in accordance with Contribution and Sale Agreement as of April 15, 2013 (Note 5 – Insurance Proceeds).
	Management believes that the allocations included in these unaudited condensed consolidated and combined carve-out financial statements are reasonable to present the financial position, results of operations and cash flows of the Partnership on a stand-alone basis. In the opinion of management these condensed consolidated and combined carve-out interim financial statements reflect all adjustments, of a normal recurring nature, necessary to present fairly in all material respects, the Partnership’s consolidated and combined carve-out interim financial statements for the three and six months ended June 30, 2014. However, the financial position, results of operations and cash flows of the Combined Entity as presented may differ from those that would have been achieved had the Partnership operated autonomously for all years presented as the Partnership would have had additional general and administrative expenses, including legal, accounting, treasury and regulatory compliance and other costs normally incurred by a stand-alone listed publicly traded entity. Accordingly, the comparative historical consolidated and combined interim financial statements do not purport to be indicative of the future financial position, results of operations or cash flows of the Partnership.
	Under the Partnership’s Partnership Agreement, the General Partner has irrevocably delegated to the Partnership’s board of directors the power to oversee and direct the operations of, manage and determine the strategies and policies of the Partnership. During the period from the IPO in April 2013 until the time of the Partnership’s first annual general meeting (“AGM”) on June 25, 2013, the General Partner retained the sole power to appoint, remove and replace all members of the Partnership’s board of directors. From the first AGM, four of the seven board members became electable by the common unitholders and accordingly, from this date, KNOT, as the owner of the General Partner, no longer retains the power to control the Partnership’s board of directors and, hence, the Partnership. As a result, the Partnership is no longer considered to be under common control with KNOT and as a consequence, the Partnership will not account for any vessel acquisitions from KNOT after June 25, 2013 as a transfer of equity interests between entities under common control.
Significant accounting policies	'
	(b) Significant accounting policies
	The accounting policies adopted in the preparation of the unaudited condensed consolidated and combined carve-out interim financial statements are consistent with those followed in the preparation of the Partnership’s audited consolidated and combined carve-out financial statements for the year ended December 31, 2013, as contained in the Partnership’s 20-F.
Adoption of New Accounting Standards	'
	(c) Adoption of New Accounting Standards
	In May 2014, the Financial Accounting Standards Board (or FASB ) issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers , (or ASU 2014-09 ). ASU 2014-09 will require entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This update creates a five-step model that requires entities to exercise judgment when considering the terms of the contract(s) which include (i) identifying the contract(s) with the customer, (ii) identifying the separate performance obligations in the contract, (iii) determining the transaction price, (iv) allocating the transaction price to the separate performance obligations, and (v) recognizing revenue when each performance obligation is satisfied. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2016 and shall be applied retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. Early adoption is not permitted. The Partnership is evaluating the effect of adopting this new accounting guidance.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Schedule of Net Liabilities Eliminated	'
	Details of the net liabilities eliminated are as follows:
	(US $ in thousands)
	Balance Sheet captions:
	Other current assets		89
	Other non-current assets		—
	Other current liabilities (*)		(6,321	)
	Other long-term liabilities (*)		(21,560	)
	Net Liabilities		(27,792	)
	(*)	The majority of the assets and liabilities not transferred to the Partnership are related to interest swap derivatives (note 6) and insurance proceeds in accordance with Contribution and Sale Agreement as of April 15, 2013 (Note 5 – Insurance Proceeds).

Segment_Information_Tables

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Revenues and Percentage of Combined Revenues for Customers	'
	The following table presents revenues and percentage of consolidated and combined revenues for customers that accounted for more than 10% of the Partnership’s consolidated and combined revenues during the three and six months ended June 30, 2014 and 2013. All of these customers are major international oil companies.
		Three Months Ended June 30,								Six Months Ended June 30,
	(U.S. Dollars in thousands)	2014				2013				2014				2013
	Brazil Shipping I Limited,	$	5,111	23	%	$	5,329	31	%	$	10,172	23	%	$	9,982	32	%
	a subsidiary of BG Group Plc
	Fronape International Company,		6,289	28	%		6,289	36	%		12,512	29	%		10,152	33	%
	a subsidiary of Petrobras Transporte S.A.
	Statoil ASA		5,646	26	%		5,650	33	%		11,113	25	%		10,346	34	%
	Repsol Sinopec Brasil, S.A.,		5,070	23	%		—				10,085	23	%		—
	a subsidiary of Repsol Sinopec Brasil, B.V.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Schedule of Realized and Unrealized Gains and Losses Recognized in Earnings	'
	The following table presents the realized and unrealized gains and losses that are recognized in earnings as net gain (loss) on derivative instruments for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
	(US $ in thousands)	2014			2013			2014			2013
	Realized gain (loss)
	Interest rate swap contracts		(700	)		—			(1,254	)		(1,116	)
	Foreign exchange forward contracts		—			—			500			—
	Unrealized gain (loss)
	Interest rate swap contracts		(1,642	)		(434	)		(1,294	)		1,029
	Foreign exchange forward contracts		—			—			(248	)		—
	Total		(2,342	)		(434	)		(2,296	)		(87	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Carrying Amounts and Estimated Fair Values of Partnership 's Financial Instruments	'
	The following table presents the carrying amounts and estimated fair values of the Partnership’s financial instruments as of June 30, 2014 and December 31, 2013. Fair value is defined as the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
		June 30, 2014				December 31, 2013
	(US $ in thousands)	Carrying		Fair Value		Carrying		Fair Value
		Amount				Amount
	Financial assets:
	Cash and cash equivalents		34,451		34,451		28,836		28,836
	Restricted cash		691		691		458		458
	Current derivative asssets:
	Interest rate swap contracts		—		—		—		—
	Foreign exchange forward contract		—		—		248		248
	Non-current derivative asset:
	Interest rate swap contracts		2,561		2,561		2,617		2,617
	Financial liabilities:
	Current derivative liabilities:
	Interest rate swap contracts		3,710		3,710		2,124		2,124
	Foreign exchange forward contract		—		—		—		—
	Non-current derivative liabilities:
	Interest rate swap contracts		—		—		—		—
	Long-term debt, current and non-current		545,774		547,890		349,977		350,999
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table presents the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis (including items that are required to be measured at fair value or for which fair value is required to be disclosed) as of June 30, 2014 and December 31, 2013:
				Fair Value Measurements at
				Reporting Date Using
	(US $ in thousands)	June 30,		Quoted Price		Significant		Significant
		2014		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				assets		(Level 2)
				(Level 1)
	Financial assets:
	Cash and cash equivalents		34,451		34,451		—		—
	Restricted cash		691		691		—		—
	Current derivative assets:
	Foreign exchange forward contract		—		—		—		—
	Non-current derivative assets:
	Interest rate swap contracts		2,561		—		2,561		—
	Financial liabilities:
	Current derivative liabilities:
	Interest rate swap contracts		3,710		—		3,710		—
	Foreign exchange foward contracts		—				—		—
	Non-current derivative liabilities:
	Interest rate swap contracts		—		—		—		—
	Long-term debt, current and non-current		547,890		—		547,890		—
				Fair Value Measurements at
				Reporting Date Using
	(US $ in thousands)	December 31,		Quoted Price		Significant		Significant
		2013		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				assets		(Level 2)
				(Level 1)
	Financial assets:
	Cash and cash equivalents		28,836		28,836		—		—
	Restricted cash		458		458		—		—
	Current derivative assets:
	Foreign exchange forward contract		248		—		248		—
	Non-current derivative assets:
	Interest rate swap contracts		2,617		—		2,617		—
	Financial liabilities:
	Current derivative liabilities:
	Interest rate swap contracts		2,124		—		2,124		—
	Foreign exchange foward contracts		—				—		—
	Non-current derivative liabilities:
	Interest rate swap contracts		—		—		—		—
	Long-term debt, current and non-current		350,999		—		350,999		—

Longterm_Debt_Tables

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-Term Debt	'
	As of June 30, 2014 and December 31, 2013, the Partnership had the following debt amounts outstanding:
	(US $ in thousands)	Vessel		June 30,		December 31,
				2014		2013
	$160 million Loan facility	Fortaleza Knutsen & Recife Knutsen			126,163		132,425
	$220 million Loan facility	Windsor Knutsen, Bodil Knutsen,			220,000		—
		Carmen Knutsen
	$20 million Revolver Credit facility	Windsor Knutsen, Bodil Knutsen,			20,000		—
		Carmen Knutsen
	$120 million Loan facility	Bodil Knutsen			—		67,615
	$85 million Loan facility	Windsor Knutsen			—		52,400
	$93 million Loan facility	Carmen Knutsen			—		87,188
	$117 million Loan facility	Hilda Knutsen			89,187		—
	$117 million Loan facility	Torill Knutsen			90,424		—
	Seller’s credit				—		10,349
	Total long-term debt				545,774		349,977
	Less current installments				38,781		29,269
	Less seller’s credit				—		10,349
	Long-term debt, excluding current installment and seller’s credit			$	506,993	$	310,359
Summary of Total Outstanding Debt Repayable	'
	The total outstanding debt as of June 30, 2014 is repayable as follows:
	(US $ in thousands)
	2014	$	19,272
	2015		39,268
	2016		131,543
	2017		25,568
	2018		160,837
	2019		169,286
	Total	$	545,774

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Schedule of Profit and Loss from Continuing Operations Before Income Taxes and Components of Current and Deferred Income Tax Expense (Benefit)	'
	Profit and loss from continuing operations before income taxes was taxable to Norway and the significant components of current and deferred income tax expense (benefit) attributable to income from continuing operations for the six months ended June 30, 2014 and 2013 are as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
	(US $ in thousands)	2014			2013			2014			2013
	Income before income taxes		2,479			3,971			8,921			3,747
	Income tax benefit (expense)		18			—			(1	)		(2,942	)
	Effective tax rate		0	%		0	%		0	%		79	%

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Schedule of Related Party Costs and Expenses	'
	The amounts of such costs and expenses included in the condensed consolidated and combined carve-out statements of operations as for the three and six months ended June 30, 2014 and 2013 are as follows:
			Three Months Ended				Six Months Ended
			June 30,				June 30,
	(US $ in thousands)		2014		2013		2014		2013
	Statements of operations:
	Time charter and bareboat revenues:
	Commercial commission fee from KNOT to Vessels (1)			—		—		—		95
	Cancellation fee from KNOT to Vessels (2)			—		—		—		3,448
	Operating expenses:
	Technical and operational management fee from KNOT to Vessels (3)			329		234		658		460
	General and administrative expenses:
	Administration fee from KNOT (4)			24		318		207		424
	Administration fee from KOAS (4)			123		—		230		—
	Administration fee from KOAS UK (4)			37		—		74		—
	Accounting service fee from KNOT (5)			126		—		151		—
	IPO administration cost from KNOT to subsidiaries (6)			—		60		—		455
	Finance income (expense):
	Financing service fee from KNOT to Vessels (7)			50		—		50		—
	Interest expense charged from KNOT (8)			124		1		252		90
	Guarantee commission from TSSI to Vessels (9)			—		30		—		210
	Guarantee commission from KNOT to Vessels (9)			—		31		—		425
	Total			813		674		1,622		5,607
	1)	Commercial commission fee from KNOT to Vessels: KNOT provides commercial services related to negotiating and maintaining the charters. KNOT invoices a fixed percentage of revenue as a commercial commission for these services.
	2)	Cancellation fee from KNOT to Vessels: In consideration for the termination of the Commercial Management Agreement a cancellation fee was agreed for each Vessel equal to the remuneration to be paid in accordance with the Commercial Management Agreement until the expire of the charter parties for each of the Vessels. As the cancellation fee relates to the commercial commission, it has been presented with operating income, consistent with the presentation of commissions.
	3)	Technical and operational management fee from KOAS and KNOT to Vessels: KOAS and KNOT provide technical and operational management of the vessels on time charter including crewing, purchasing, maintenance and other operational, bookkeeping and administrative support. For bareboat charters, KOAS provides bookkeeping and administrative support. KOAS invoices a fixed amount per day per vessel based upon providing either time charter or bareboat services. In addition, there is also a charge for 24 hour emergency response services provided by KOAS for all vessels managed by KOAS and KNOT. The direct cost for the response services has been allocated to all vessels without a mark-up based upon the number of vessels in managed by KOAS and KNOT.
	4)	Administration fee from KNOT, KOAS and KOAS UK: Administration costs include the compensation and benefits of KNOT management and administrative staff as well as other general and administration expenses. Net administration costs are total administration cost plus a 5% margin, reduced for the total fees for services delivered by the administration staffs (the accounting service fees (see (5) below), and the estimated shareholder costs for KNOT that have not been allocated. As such, the level of net administration costs as a basis for the allocation can vary from year to year based on the administration and financing services offered by KNOT to all the vessels in its fleet each year.
	5)	Accounting service fee from KNOT : KNOT invoiced each subsidiary a fixed fee for the preparation of the statutory financial statements (including Knutsen Shuttle Tankers XII KS, which owns the Recife Knutsen and the Fortaleza Knutsen, Knutsen Shuttle Tankers XII AS and KNOT Shuttle Tankers 12 AS). Such charges were allocated to the Bodil Knutsen and the Windsor Knutsen based on the number of vessels in the legal entity until the Bodil Knutsen and Windsor Knutsen were sold to KNOT Shuttle Tankers 17 AS and KNOT Shuttle Tankers 18 AS as part of the reorganization prior to the IPO.
	6)	IPO administration cost from KNOT: In connection with the preparation of the financial statements and the Partnership’s Registration statement for the IPO, KNOT has invoiced actual cost for internal resources, including salaries and administration cost, plus a 5% margin. Since the costs were not incremental cost directly attributable to the IPO, they were expensed as incurred.
	7)	Financing service fee from KNOT to Vessels: KNOT invoiced each vessel for a fixed amount in relation to new loan facilities for vessel financing as compensation for the time and cost of loan negotiations with external banks.
	8)	Interest expense charged from, interest income charged to KNOT/TSSI: KNOT/TSSI invoiced interest expense (income) for any outstanding payables to (receivable from) owners and affiliates to the vessel-owning subsidiaries (including Knutsen Shuttle Tankers XII KS, which owns the Recife Knutsen and the Fortaleza Knutsen, Knutsen Shuttle Tankers XII AS and KNOT Shuttle Tankers 12 AS). Since payables to (receivables from) owners and affiliates are not tracked by vessel, balances based upon payments by owners to the shipyard have been allocated to the Bodil Knutsen and the Windsor Knutsen. See Note 2(a) – Summary of Significant Accounting Policies: Basis of Preparation for a description of the allocation principles applied. Interest expense has been allocated based upon the allocated payables to owners and affiliates and the historical interest rates charged.
	9)	Guarantee commission from TSSI/KNOT to Vessels: TSSI and KNOT were guarantors for the Predecessor’s loan facilities (see (b) Guarantees below). TSSI and KNOT invoiced an annual commission to each of the Vessels as a fixed percentage of the outstanding balance as compensation for the guarantee.
Summary of Amounts Due from (to) Related Parties	'
	Balances with related parties consisted of the following:
	(US $ in thousands)		At June 30,		At December 31,
			2014		2013
	Balance Sheets:
	Trading balances due from KOAS			19		27
	Trading balances due from KNOT and affiliates			25		50
	Amount due from related parties			44		77
	Trading balances due to KOAS			265		141
	Trading balances due to KNOT and affiliates			3,253		22
	Amount due to related parties			3,518		163
Schedule of Trade Accounts Payables to Related Parties	'
	Balances with trade accounts payables to related parties consisted of the following:
	(US $ in thousands)		At June 30,		At December 31,
			2014		2013
	Balance Sheets:
	Trading balances due to KOAS			334		498
	Trading balances due to KNOT and affiliates			195		271
	Trading balances due to NYK			6		—
	Trade accounts payables to related parties			535		769

Earnings_per_Unit_and_Cash_Dis1

Earnings per Unit and Cash Distributions (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Calculations of Basic and Diluted Earnings per Unit	'
	The calculations of basic and diluted earnings per unit are presented below:
	(US $ in thousands, except per unit data)		Three			April 15			Six
			Months Ended			to			Months Ended
			June 30,			June 30,			June 30, 2014
			2014			2013
	Post IPO net income attributable to the members of KNOT Offshore Partners LP		$	2,497		$	4,343		$	8,921
	Less: Distribution paid (2)			9,945			5,547			17,560
	Under (over) distributed earnings			(7,448	)		(1,204	)		(8,639	)
	Under (over) distributed earnings attributable to:
	Common unitholders			(4,788	)		—			(5,371	)
	Subordinated unitholders			(2,511	)		(1,204	)		(3,095	)
	General Partner			(149	)		—			(173	)
	Weighted average units outstanding (basic and diluted) (in thousands):
	Common unitholders			8,719			8,568			8,643
	Subordinated unitholders			8,568			8,568			8,568
	General Partner			353			350			351
	Earnings per unit (basic and diluted):
	Common unitholders		$	0.14		$	0.317		$	0.505
	Subordinated unitholders (3)			0.143			0.177			0.511
	General Partner			0.141			0.317			0.507
	Cash distributions declared and paid in the period per unit (4)			0.435			—			0.435
	Subsequent event: Cash distributions declared and paid per unit relating to the period (5)			0.435			0.317			0.435
	-1	Earnings per unit have been calculated in accordance with the cash distribution guidelines set forth in the Partnership’s First Amended and Restated Agreement of Limited Partnership (the “Partnership Agreement”).
	-2	This refers to distributions made or to be made in relation to the period irrespective of the declaration and payment dates and based on the numbers of units outstanding at the record date. This includes cash distributions to the IDR holders (Knutsen NYK Offshore Tankers AS) for the three months ended June 30, 2014 and 2013 of $0.01 million and $nil, respectively, and for the six months ended June 30, 2014 and 2013 of $0.02 million and $nil, respectively.
	-3	This includes the net income attributable to IDR holders. The IDRs generally may not be transferred until March 31, 2018. The net income attributable to IDRs for the three and six months ended June 30, 2014 is $0.01 million and $0.02 million, respectively. There was no net income attributable to IDRs for the period April 15 to June 30, 2013.
	-4	Refers to cash distribution declared and paid during the period.
	-5	Refers to cash distribution declared and paid subsequent to the period end.

Business_Acquisitions_Tables

Business Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Schedule of Fair Values Allocated to Each Class of Identifiable Assets of Hilda Knutsen and Torill Knutsen Acquisition and Difference between Purchase Price and Net Asset Acquired	'
	The fair values allocated to each class of identifiable assets of the Hilda Knutsen and Torill Knutsen and the difference between the purchase price and net asset acquired were calculated as follows:
	(US $ in thousands)		June 30, 2014
	Purchase consideration (1)					114,293
	Less: Fair value of net assets acquired:
	Vessel and equipment			335,000
	Cash			8,997
	Inventories			395
	Others current assets			1,939
	Amounts due from related parties			4
	Long-term debt			(221,812	)
	Other long-term liabilities			(4,774	)
	Derivatives liabilities			(348	)
	Trade accounts payable			(390	)
	Accrued expenses			(1,360	)
	Prepaid charter and deferred revenue			(1,487	)
	Amounts due to related parties			(2,338	)
	Sub total			113,826
	Difference between the purchase price and fair value of net assets acquired					467
	Goodwill					467
	Difference between the purchase price and allocated values					—
	The goodwill recognized in connection with the acquisitions of Hilda Knutsen and Torill Knutsen is attributable primarily to the organization, including structure, systems, skills and abilities.
	-1	The purchase consideration of $114.3 million comprises the following:
	(US $ in thousands)
	Cash consideration paid to KNOT			113,306
	Purchase price adjustments			987
	Total purchase consideration			114,293
Schedule of Summarized Consolidated Pro Forma Financial Information	'
	Hilda Knutsen and Torill Knutsen were delivered August 5, and November 4, 2013, respectively, there is no pro forma figure for six months ended June 30, 2013.
	(US $ in thousands, except per unit data)		Six Months Ended
			30-Jun-14
	Revenue			67,074
	Net income			16,096

Equity_Offerings_Tables

Equity Offerings (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Schedule of Equity Offerings	'
	(US $ in thousands)		As of
			June 30,
			2014
	Gross proceeds received (1)			133,447
	Less: Underwriters’ discount			4,381
	Less: Offering expenses			315
	Net proceeds received			128,751
		-1	Includes General Partner’s 2% proportional capital contribution

Description_of_Business_Additi

Description of Business - Additional Information (Detail) (USD $)

0 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 27, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 27, 2014

Apr. 30, 2013

Jun. 30, 2014

Jul. 24, 2014

Jul. 17, 2014

Jun. 30, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 27, 2014

Jun. 30, 2014

Jun. 30, 2014

Tanker

IPO Administration Cost [Member]

IPO Administration Cost [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subordinated Units [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

Common Units [Member]

Common Units [Member]

Partnership Units [Member]

KNOT Offshore Partners UK LLC [Member]

Hilda Knutsen And Torill Knutsen [Member]

IPO Administration Cost [Member]

IPO Administration Cost [Member]

IPO Administration Cost [Member]

Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of ownership interest owned

'

'

'

40.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shuttle tankers to be acquired

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Initial public offering completion date

15-Apr-13

'

'

15-Apr-13

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of ownership interests to be acquired by Partnership in four shuttle tankers

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership percentage of limited liability company

'

'

49.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

Ownership description

'

'

'

'the Partnership acquired a 100% ownership interest in KNOT Shuttle Tankers AS, a wholly owned subsidiary of KNOT, which as of February 27,2013 directly or indirectly owned (1) 100% of Knutsen Shuttle Tankers XII KS,the owner of the Recife Knutsen and the Fortaleza Knutsen , (2) 100% of Knutsen Shuttle Tankers XII AS, the general partner of Knutsen Shuttle Tankers XII KS and (3) the Windsor Knutsen and the Bodil Knutsen and all of their related charters, inventory and long-term debt. In establishing the new KNOT Shuttle Tankers AS structure, KNOT formed three new Norwegian subsidiaries, which acquired 90% of Knutsen Shuttle Tankers XII KS, 100% of the Windsor Knutsen and 100% of the Bodil Knutsen , respectively.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common units issued to public

'

'

'

'

'

8,567,500

'

'

'

8,567,500

'

'

'

'

8,567,500

4,600,000

'

'

Percentage of limited liability company

'

'

'

'

'

'

'

'

'

49.00%

'

'

'

'

49.00%

'

'

'

Percentage of incentive distribution rights

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

Percentage of interest held by general partner

'

2.00%

'

2.00%

'

'

'

'

'

'

2.00%

2.00%

2.00%

'

'

'

'

'

Common units sold pursuant to the full exercise of underwriters' options

'

'

'

'

'

1,117,500

1,117,500

'

'

'

'

'

'

1,117,500

'

'

'

'

Gross proceeds from IPO

'

'

'

'

'

$179.90

$179.90

'

'

'

'

'

'

'

'

'

'

'

Issuance of adiitional partnership common units

'

'

'

'

690,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Option to purchase additional common units

'

'

'

'

'

'

'

490,000

150,000

'

'

'

'

'

'

'

'

'

Percentage of general partner interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

Net proceeds from offering and option exercises

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

143.7

Capital contributions by general partner

'

'

'

$0.40

$2.70

'

'

'

'

'

'

'

'

'

'

'

'

$3

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Apr. 16, 2013
In Thousands, unless otherwise specified
Regulatory Assets [Abstract]	'	'	'
Net liabilities	($586,925)	($378,246)	($27,792)

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Schedule of Net Liabilities Eliminated (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Apr. 16, 2013
In Thousands, unless otherwise specified
Regulatory Assets [Abstract]	'	'	'
Other current assets	$4,171	$1,814	$89
Other non-current assets	'	'	'
Other current liabilities	'	'	-6,321
Other long-term liabilities	-5,128	-567	-21,560
Net Liabilities	($586,925)	($378,246)	($27,792)

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Schedule of Net Liabilities Eliminated (Parenthetical) (Detail)	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Regulatory Assets [Abstract]	'	'
Initial public offering completion date	15-Apr-13	15-Apr-13

Formation_Transactions_and_Ini1

Formation Transactions and Initial Public Offering - Additional Information (Detail) (USD $)

0 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

Jun. 27, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Apr. 30, 2013

Jun. 30, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Apr. 30, 2013

Apr. 30, 2013

Apr. 30, 2013

Apr. 30, 2013

IPO Administration Cost [Member]

IPO Administration Cost [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

KNOT Offshore Partners UK LLC [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

Partnership [Member]

Incentive Distribution Rights [Member]

IPO Administration Cost [Member]

IPO Administration Cost [Member]

Securities Financing Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of contribution to subsidiary

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

Number of subordinated units issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,567,500

'

'

'

Percentage of limited partner interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49.00%

100.00%

Increase in cash the partnership distributed in excess per unit

'

$0.43

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of general partner units issued to the General Partner

'

'

'

'

'

'

'

'

349,694

'

'

'

'

'

'

'

'

'

'

'

Percentage of partnership interest held by General Partner

2.00%

'

'

'

2.00%

'

'

'

2.00%

2.00%

2.00%

'

'

'

'

'

'

'

'

'

Percentage of limited liability company

'

49.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common units sold and issued

'

'

'

'

'

'

8,567,500

'

'

'

'

'

'

'

'

'

'

'

'

'

Common unit, per share amount

'

'

'

'

'

'

$21

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross proceeds upon IPO

'

'

'

'

'

'

$179,900,000

$179,900,000

'

'

'

'

'

'

'

'

'

'

'

'

Common units sold pursuant to the full exercise of the underwriters'

'

'

'

'

'

'

1,117,500

1,117,500

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds upon IPO

'

'

'

'

129,066,000

168,313,000

160,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash distribution

'

'

9,945,000

5,547,000

'

21,954,000

'

'

'

'

'

'

10,000

0

20,000

0

'

21,950,000

'

'

Repayment of outstanding debt

'

'

'

'

'

'

118,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

One-time entrance tax

'

'

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility, outstanding

'

'

$20,000,000

'

$20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Segment_Information_Additional

Segment Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Vessel	Times	Boats	Vessel
	Times	Boats	Times	Boats
	Boats	Vessel	Vessel	Times
			Segment
Segment Reporting [Abstract]	'	'	'	'
Number of vessels	5	4	5	4
Number of time charters	3	2	3	2
Number of bareboat charters	2	2	2	2
Number of reportable segments	'	'	1	'

Significant_Risks_and_Uncertai

Significant Risks and Uncertainties Including Business and Credit Concentrations - Additional Information (Detail) (Minimum [Member])	12 Months Ended
	Dec. 31, 2013
Minimum [Member]	'
Revenue, Major Customer [Line Items]	'
Benchmark percentage of revenues and combined revenues concentration	10.00%

Segment_Information_Schedule_o

Segment Information - Schedule of Revenues and Percentage of Combined Revenues for Customers (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue, Major Customer [Line Items]	'	'	'	'
Revenues	$22,119	$17,268	$43,893	$30,730
Brazil Shipping I Limited, a Subsidiary of BG Group Plc [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenues	5,111	5,329	10,172	9,982
Brazil Shipping I Limited, a Subsidiary of BG Group Plc [Member] | Revenues [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Percentage of combined revenues for customers	23.00%	31.00%	23.00%	32.00%
Fronape International Company, a Subsidiary of Petrobras Transporte S.A. [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenues	6,289	6,289	12,512	10,152
Fronape International Company, a Subsidiary of Petrobras Transporte S.A. [Member] | Revenues [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Percentage of combined revenues for customers	28.00%	36.00%	29.00%	33.00%
Statoil ASA [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenues	5,646	5,650	11,113	10,346
Statoil ASA [Member] | Revenues [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Percentage of combined revenues for customers	26.00%	33.00%	25.00%	34.00%
Repsol Sinopec Brasil, S.A., a Subsidiary of Repsol Sinopec Brasil, B.V. [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenues	$5,070	'	$10,085	'
Repsol Sinopec Brasil, S.A., a Subsidiary of Repsol Sinopec Brasil, B.V. [Member] | Revenues [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Percentage of combined revenues for customers	23.00%	'	23.00%	'

Insurance_Proceeds_Additional_

Insurance Proceeds - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended
	Apr. 15, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Apr. 15, 2013	Jun. 30, 2014
				Windsor Knutsen [Member]	Windsor Knutsen [Member]	Windsor Knutsen [Member]	Windsor Knutsen [Member]	Windsor Knutsen [Member]	Windsor Knutsen [Member]
								Hull and Machinery Insurance [Member]	Hull and Machinery Insurance [Member]
Business Interruption Loss [Line Items]	'	'	'	'	'	'	'	'	'
Partnership's loss, description	'	'	'	'	'	'Under the Partnership's loss of hire policies, its insurer will pay the Partnership the hire rate agreed in respect of each vessel for each day, in excess of 14 deductible days, for the time that the Vessel is out of service as a result of damage, for a maximum of 180 days	'	'	'
Vessel, off-hire period	'	'	'	'	'	'April 1, 2012 to June 24, 2012	'	'	'
Insurance recoveries	'	'	$250,000	$0	$0	$0	$300,000	$3,500,000	$0
Cost of repairs, vessel operating expenses	$4,000,000	$0	'	'	'	'	'	'	'

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail)	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified		Interest Rate Swap Contracts [Member]	Interest Rate Swap Contracts [Member]	Foreign Exchange Forward Contracts [Member]	Foreign Exchange Forward Contracts [Member]	Foreign Exchange Forward Contracts [Member]	Foreign Exchange Forward Contracts [Member]
		USD ($)	USD ($)	USD ($)	NOK	USD ($)	NOK
				Contract
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'	'	'	'
Derivative, Notional amount of outstanding obligations	'	$350	$200	'	0	'	124.4
Derivative, lower fixed interest rate range	1.25%	'	'	'	'	'	'
Derivative, higher fixed interest rate range	1.46%	'	'	'	'	'	'
Carrying amount of derivative assets	'	'	0.5	0	'	0.2	'
Carrying amount of derivative liabilities	'	$1.20	'	'	'	'	'
Derivative, Number of contracts outstanding	'	'	'	0	0	'	'

Derivative_Instruments_Schedul

Derivative Instruments - Schedule of Realized and Unrealized Gains and Losses Recognized in Earnings (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Realized gain (loss)	($2,342)	($434)	($2,296)	($87)
Unrealized gain (loss)	'	'	-1,542	1,029
Interest Rate Swap Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Realized gain (loss)	-700	'	-1,254	-1,116
Unrealized gain (loss)	-1,642	-434	-1,294	1,029
Foreign Exchange Forward Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Realized gain (loss)	'	'	500	'
Unrealized gain (loss)	'	'	($248)	'

Fair_Value_Measurements_Carryi

Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Partnership 's Financial Instruments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial assets:	'	'	'	'
Cash and cash equivalents	$34,451	$28,836	$25,218	$1,287
Current derivative assets	'	248	'	'
Non-current derivative asset	2,561	2,617	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	3,710	2,124	'	'
Non-current derivative liabilities	'	'	'	'
Long-term debt, current and non-current	545,774	349,977	'	'
Interest Rate Swap Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Non-current derivative asset	2,561	2,617	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	3,710	2,124	'	'
Non-current derivative liabilities	'	'	'	'
Foreign Exchange Forward Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Current derivative assets	'	248	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	'	'	'	'
Carrying Amount [Member]	'	'	'	'
Financial assets:	'	'	'	'
Cash and cash equivalents	34,451	28,836	'	'
Restricted cash	691	458	'	'
Financial liabilities:	'	'	'	'
Long-term debt, current and non-current	545,774	349,977	'	'
Carrying Amount [Member] | Interest Rate Swap Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Current derivative assets	'	'	'	'
Non-current derivative asset	2,561	2,617	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	3,710	2,124	'	'
Non-current derivative liabilities	'	'	'	'
Carrying Amount [Member] | Foreign Exchange Forward Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Current derivative assets	'	248	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	'	'	'	'
Fair Value [Member]	'	'	'	'
Financial assets:	'	'	'	'
Cash and cash equivalents	34,451	28,836	'	'
Restricted cash	691	458	'	'
Financial liabilities:	'	'	'	'
Long-term debt, current and non-current	547,890	350,999	'	'
Fair Value [Member] | Interest Rate Swap Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Current derivative assets	'	'	'	'
Non-current derivative asset	2,561	2,617	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	3,710	2,124	'	'
Non-current derivative liabilities	'	'	'	'
Fair Value [Member] | Foreign Exchange Forward Contracts [Member]	'	'	'	'
Financial assets:	'	'	'	'
Current derivative assets	'	248	'	'
Financial liabilities:	'	'	'	'
Current derivative liabilities	'	'	'	'

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial assets:	'	'
Cash and cash equivalents	$34,451	$28,836
Restricted cash	691	458
Current derivative asset	'	248
Non-current derivative assets	2,561	2,617
Financial liabilities:	'	'
Current derivative liabilities	3,710	2,124
Non-current derivative liabilities	'	'
Long-term debt, current and non-current	547,890	350,999
Foreign Exchange Forward Contracts [Member]	'	'
Financial assets:	'	'
Current derivative asset	'	248
Financial liabilities:	'	'
Current derivative liabilities	'	'
Interest Rate Swap Contracts [Member]	'	'
Financial assets:	'	'
Non-current derivative assets	2,561	2,617
Financial liabilities:	'	'
Current derivative liabilities	3,710	2,124
Non-current derivative liabilities	'	'
Quoted Price in Active Markets for Identical Assets (Level 1) [Member]	'	'
Financial assets:	'	'
Cash and cash equivalents	34,451	28,836
Restricted cash	691	458
Significant Other Observable Inputs (Level 2) [Member]	'	'
Financial liabilities:	'	'
Long-term debt, current and non-current	547,890	350,999
Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Forward Contracts [Member]	'	'
Financial assets:	'	'
Current derivative asset	'	248
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap Contracts [Member]	'	'
Financial assets:	'	'
Non-current derivative assets	2,561	2,617
Financial liabilities:	'	'
Current derivative liabilities	$3,710	$2,124

LongTerm_Debt_Schedule_of_Long

Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total long-term debt	$545,774	$349,977
Less current installments	38,781	29,269
Long-term debt, excluding current installment and seller's credit	506,993	310,359
Total long-term debt	545,774	349,977
160 Million Loan Facility [Member] | Fortaleza Knutsen and Recife Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	126,163	132,425
Total long-term debt	126,163	132,425
220 Million Loan Facility [Member] | Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	220,000	'
Total long-term debt	220,000	'
20 Million Revolver Credit Facility [Member] | Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	20,000	'
Total long-term debt	20,000	'
120 Million Loan Facility [Member] | Bodil Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	'	67,615
Total long-term debt	'	67,615
85 Million Loan Facility [Member] | Windsor Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	'	52,400
Total long-term debt	'	52,400
93 Million Loan Facility [Member] | Carmen Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	'	87,188
Total long-term debt	'	87,188
117 Million Loan Facility [Member] | Hilda Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	89,187	'
Total long-term debt	89,187	'
117 Million Loan Facility [Member] | Torill Knutsen [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	90,424	'
Total long-term debt	90,424	'
Seller's Credit [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	'	10,349
Total long-term debt	'	$10,349

LongTerm_Debt_Schedule_of_Long1

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
160 Million Loan Facility [Member] | Fortaleza Knutsen and Recife Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	$160
220 Million Loan Facility [Member] | Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	220
20 Million Revolver Credit Facility [Member] | Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	20
120 Million Loan Facility [Member] | Bodil Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	120
85 Million Loan Facility [Member] | Windsor Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	85
93 Million Loan Facility [Member] | Carmen Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	93
117 Million Loan Facility [Member] | Hilda Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	117
117 Million Loan Facility [Member] | Torill Knutsen [Member]	'
Debt Instrument [Line Items]	'
Debt instrument face amount	$117

LongTerm_Debt_Summary_of_Total

Long-Term Debt - Summary of Total Outstanding Debt Repayable (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instruments [Abstract]	'	'
2014	$19,272	'
2015	39,268	'
2016	131,543	'
2017	25,568	'
2018	160,837	'
2019	169,286	'
Total	$545,774	$349,977

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)

1 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2014

CreditFacility

Fortaleza Knutsen and Recife Knutsen [Member]

240 Million Secured Loan Facility [Member]

240 Million Secured Loan Facility [Member]

240 Million Secured Loan Facility [Member]

120 Million Loan Facility [Member]

120 Million Loan Facility [Member]

120 Million Loan Facility [Member]

85 Million Loan Facility [Member]

85 Million Loan Facility [Member]

85 Million Loan Facility [Member]

93 Million Loan Facility [Member]

93 Million Loan Facility [Member]

93 Million Loan Facility [Member]

160 Million Secured Loan Facility [Member]

160 Million Secured Loan Facility [Member]

160 Million Secured Loan Facility [Member]

160 Million Secured Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

10.5 Million Seller's Credit [Member]

Senior Term Loan [Member]

Term Loan [Member]

Senior Secured Credit Facilities [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan Facility [Member]

Term Loan A And B [Member]

First Two Years [Member]

First Two Years [Member]

First Two Years [Member]

Fourth Year [Member]

Fourth Year [Member]

Fourth Year [Member]

Fifth Year [Member]

Fifth Year [Member]

Fifth Year [Member]

Subsequent Event [Member]

Vessel

Vessel Acquired [Member]

Vessel Owned [Member]

Bodil Knutsen [Member]

Bodil Knutsen [Member]

Windsor Knutsen [Member]

Windsor Knutsen [Member]

Carmen Knutsen [Member]

Carmen Knutsen [Member]

Vessel

Vessel Acquired [Member]

Vessel Owned [Member]

Fortaleza Knutsen and Recife Knutsen [Member]

Torill Facility [Member]

Torill Facility [Member]

Torill Facility [Member]

Hilda Facility [Member]

Hilda Facility [Member]

Hilda Facility [Member]

Hilda Facility [Member]

Carmen Knutsen [Member]

240 Million Secured Loan Facility [Member]

240 Million Secured Loan Facility [Member]

240 Million Secured Loan Facility [Member]

240 Million Secured Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

240 Million Secured Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

240 Million Secured Loan Facility [Member]

117 Million Loan Facility [Member]

117 Million Loan Facility [Member]

140 Million Loan Facilities [Member]

Tranches

Vessel

Vessel Acquired [Member]

Vessel Owned [Member]

Vessel

Vessel Acquired [Member]

Vessel Owned [Member]

Libor Rate [Member]

Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]

Torill Facility [Member]

Hilda Facility [Member]

Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]

Torill Facility [Member]

Hilda Facility [Member]

Windsor Knutsen, Bodil Knutsen, Carmen Knutsen [Member]

Torill Facility [Member]

Hilda Facility [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior secured credit facility

'

'

'

'

'

$240,000,000

'

'

'

$120,000,000

'

'

$85,000,000

'

'

$93,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

$240,000,000

$220,000,000

$380,000,000

$20,000,000

$20,000,000

$220,000,000

$140,000,000

'

'

'

'

'

'

'

'

'

$140,000,000

Senior secured credit facilities partnership

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of existing credit facility

'

'

'

'

'

'

'

'

120,000,000

'

'

85,000,000

'

'

93,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility replaced by new credit facility

'

'

'

'

160,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long term debt interest rate description

'

'

'

'

'

'LIBOR plus a fixed margin of 2.125%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR plus a fixed margin of 3.0%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long term debt interest rate percentage

'

'

'

'

'

2.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility commitment fee percentage

'

'

'

'

'

40.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility expiration date

'

'

'

'

'

30-Jun-19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Oct-18

'

'

31-Jul-18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility expiration period

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Market value percentage of secured loan facility outstanding balance

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

110.00%

110.00%

110.00%

120.00%

120.00%

120.00%

125.00%

125.00%

125.00%

'

Minimum liquidity of Partnership

'

'

'

'

'

15,000,000

'

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

15,000,000

'

'

15,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of vessel acquired

'

'

'

'

'

8

'

'

'

'

'

'

'

'

'

'

'

8

'

'

'

8

'

'

8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in minimum liquidity of partnership

'

'

'

'

'

'

1,000,000

1,500,000

'

'

'

'

'

'

'

'

'

'

1,000,000

1,500,000

'

'

1,000,000

1,500,000

'

1,000,000

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum book equity ratio for Partnership

49.00%

'

'

'

'

30.00%

'

'

'

'

'

'

'

'

'

'

'

30.00%

'

'

'

30.00%

'

'

30.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum EBITDA to interest ratio

'

'

'

'

'

2.5

'

'

'

'

'

'

'

'

'

'

'

2.5

'

'

'

2.5

'

'

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior secured loan facility quarterly repayable installments description

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Each tranche is repayable in quarterly installments over five years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured loan facility maturity date description

'

'The Seller Loan is non-amortizing and matures in August 2018 or earlier if the parties agree.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'March 2016 and August 2016

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of tranches

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of secured loan facility

'

545,774,000

'

349,977,000

'

'

'

'

'

'

67,615,000

'

'

52,400,000

'

'

87,188,000

'

'

'

'

117,000,000

'

'

117,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of fixed interest margin rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

'

'

'

'

'

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of secured loan facility

'

255,667,000

130,397,000

'

'

'

'

'

'

120,000,000

'

'

85,000,000

'

'

93,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment date

'

'

'

'

'

'

'

'

'

30-Jun-14

'

'

30-Jun-14

'

'

30-Jun-14

'

'

'

'

'

'

'

'

'

'

'

'

30-Jun-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from long term debt

'

$240,000,000

'

'

'

'

'

'

'

$240,000,000

'

'

$240,000,000

'

'

$240,000,000

'

'

'

'

'

'

'

'

'

'

'

'

$240,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2013
Income Tax Rate Reconciliation [Line Items]	'	'	'	'
Entrance tax	'	'	'	$3,000,000
Tax rate	'	28.00%	'	'
Entrance tax, annual decline in gain	'	20.00%	'	'
Entrance tax payable	'	'	2,700,000	'
Income tax rate, deferred tax liabilities	'	27.00%	'	'
Entrance tax paid, current	600,000	'	'	'
Entrance tax payable, non current	2,100,000	2,100,000	'	'
Estimated tax payable	1,000	1,000	200,000	'
Total taxes payable	200,000	200,000	'	'
Deferred tax assets	0	0	0	'
Norwegian Kroner [Member]	'	'	'	'
Income Tax Rate Reconciliation [Line Items]	'	'	'	'
Entrance tax	$3,000,000	$3,000,000	'	'

Income_Taxes_Schedule_of_Profi

Income Taxes - Schedule of Profit and Loss from Continuing Operations Before Income Taxes and Components of Current and Deferred Income Tax Expense (Benefit) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Income before income taxes	$2,479	$3,971	$8,922	$3,747
Income tax benefit (expense)	$18	'	($1)	($2,942)
Effective tax rate	0.00%	0.00%	0.00%	79.00%

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail)

0 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

Aug. 01, 2013

Jun. 30, 2014

Aug. 01, 2013

Aug. 01, 2013

Jun. 30, 2014

Aug. 01, 2013

Jun. 30, 2014

Jun. 30, 2014

Jul. 01, 2012

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

USD ($)

Knutsen Shuttle Tankers 13 AS [Member]

Knutsen Shuttle Tankers 14 AS [Member]

Seller's Credit [Member]

TSSI [Member]

NYK [Member]

KNOT Management AS [Member]

Non-Management Directors [Member]

Non-Management Directors [Member]

Chief Executive and Financial Officer [Member]

Chief Executive and Financial Officer [Member]

Chief Executive and Financial Officer [Member]

USD ($)

Director Fee [Member]

Committee Fee [Member]

GBP (£)

USD ($)

Relocation Expenses [Member]

USD ($)

USD ($)

Maximum [Member]

GBP (£)

Schedule of Other Related Party Transactions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partnership, ownership interest

'

'

'

100.00%

100.00%

'

50.00%

50.00%

'

'

'

'

'

'

Limited partnership (LP), ownership structure

'

'KNOT is owned 50% by TSSI and 50% by NYK. TSSI also controls 99% of KOAS, which subcontracts services from Knutsen OAS Management AS, which served as the vessel management companies for KNOT and its subsidiaries until June 30, 2012. As of July 1, 2012, KNOT Management AS, a 100% owned subsidiary of KNOT, assumed responsibility for the commercial and technical management of the Vessels.

'

'

'

'

'

'

'

'

'

'

'

'

Ownership percentage by parent

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

Commercial Management Agreement termination, date

'

18-Feb-13

'

'

'

'

'

'

'

'

'

'

'

'

Partnership agreement, description

'

'On March 25, 2013, the Partnership entered into an administrative services agreement with KNOT UK, pursuant to which KNOT UK provides administrative services, and KNOT UK is permitted to subcontract certain of the administrative services provided under the administrative services agreement to KOAS UK and KOAS. Certain of the services intended to be provided to the Partnership by KOAS have been performed by KNOT under the same terms as the services provide to the Partnership by KOAS.

'

'

'

'

'

'

'

'

'

'

'

'

Guarantor obligations, related party disclosure

'

'Pursuant to the Omnibus Agreement, KNOT agreed to guarantee the payments of the hire rate under the existing charters of each of the Bodil Knutsen and the Windsor Knutsen for a period of five years from the closing date of the IPO. The Partnership will not incur any guarantee commissions in the future relating to such guarantees.

'

'

'

'

'

'

'

'

'

'

'

'

Partnership term, description

'

'The new charter has an initial term of two years. BG Group has options to extend the term of the new charter for three additional one-year periods. The new charter will commence in the fourth quarter of 2015. If all three extension options are exercised, the Windsor Knutsen will operate for BG Group until the end of 2020.

'

'

'

'

'

'

'

'

'

'

'

'

Partnership term, period

'

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

Agreement date

'

'

'

'

'

'

'

'

'

'

'

28-Mar-13

'

'

Effective date of agreement

'

'

'

'

'

'

'

'

'

'

'

28-Apr-13

'

'

Management and Directors, Compensation

'

'

'

'

'

'

'

'

'

$40,000

$5,000

£ 200,000

'

£ 30,000

Accrued salaries

'

'

'

'

'

'

'

'

'

'

'

'

47,000

'

Business acquisition purchase price settlement, loan

'

'

'

'

'

10,500,000

'

'

'

'

'

'

'

'

Business acquisition purchase price settlement, loan

'

'The Seller Loan is non-amortizing and matures in August 2018 or earlier if the parties agree.

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, description

'

'The Seller Loan bears interest at LIBOR plus a margin of 4.5%.

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate

'

'

4.50%

'

'

'

'

'

'

'

'

'

'

'

Default interest rate, per annum

8.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan reduced as settlement for working capital

$100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Related_Party_Transactions_Sch

Related Party Transactions - Schedule of Related Party Costs and Expenses (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Time charter and bareboat revenues	$813	$674	$1,622	$5,607
KNOT [Member] | Commercial Commission Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Time charter and bareboat revenues	'	'	'	95
KNOT [Member] | Cancellation Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Time charter and bareboat revenues	'	'	'	3,448
KNOT [Member] | Technical and Operational Management Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Operating expenses	329	234	658	460
KNOT [Member] | Administration Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
General and administrative expenses	24	318	207	424
KNOT [Member] | Accounting Service Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
General and administrative expenses	126	'	151	'
KNOT [Member] | IPO Administration Cost [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
General and administrative expenses	'	60	'	455
KNOT [Member] | Financing Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Finance income (expense)	50	'	50	'
KNOT [Member] | Interest Expenses [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Interest expense charged from KNOT	124	1	252	90
KNOT [Member] | Guarantee Commission [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Finance income (expense)	'	31	'	425
KOAS [Member] | Administration Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
General and administrative expenses	123	'	230	'
KOAS UK [Member] | Administration Fee [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
General and administrative expenses	37	'	74	'
TSSI [Member] | Guarantee Commission [Member]	'	'	'	'
Schedule of Other Related Party Transactions [Line Items]	'	'	'	'
Finance income (expense)	'	$30	'	$210

Related_Party_Transactions_Sch1

Related Party Transactions - Schedule of Related Party Costs and Expenses (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014
Commitment Contingency And Related Party Transactions [Abstract]	'
Margin rate on administration cost	5.00%

Related_Party_Transactions_Sum

Related Party Transactions - Summary of Amounts Due from (to) Related Parties (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance Sheets:	'	'
Amount due from related parties	$44	$77
Amount due to related parties	3,518	163
KOAS [Member]	'	'
Balance Sheets:	'	'
Amount due from related parties	19	27
Amount due to related parties	265	141
KNOT [Member]	'	'
Balance Sheets:	'	'
Amount due from related parties	25	50
Amount due to related parties	$3,253	$22

Related_Party_Transactions_Sch2

Related Party Transactions - Schedule of Trade Accounts Payables to Related Parties (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance Sheets:	'	'
Amount due to related parties	$3,518	$163
KOAS [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	265	141
KNOT [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	3,253	22
Trade Accounts Payables [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	535	769
Trade Accounts Payables [Member] | KOAS [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	334	498
Trade Accounts Payables [Member] | KNOT [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	195	271
Trade Accounts Payables [Member] | NYK [Member]	'	'
Balance Sheets:	'	'
Amount due to related parties	$6	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended
	Apr. 15, 2013	Jun. 30, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]	'	'	'
Book value of assets pledged as security	'	$939,000,000	$618,000,000
Cost for repairs	4,000,000	0	'
Insurance coverage deductible amount per vessel	'	150,000	'
Lost hire compensation insurance coverage, description	'	'Under the loss of hire policies, the insurer will pay a compensation for the lost hire rate agreed in respect of each Vessel for each day, in excess of a 14 deductible days, for the time that the Vessel is out of service as a result of damage, for a maximum of 180 days.	'
Insurance coverage for pollution, maximum liability per vessel	'	1,000,000,000	'
Lost hire compensation insurance coverage, deductible days	'	'14 days	'
Lost hire compensation insurance coverage, maximum days	'	'180 days	'
Scenario Forecast [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Cost for repairs	'	600,000	'
Bodil Knutsen [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Cost for repairs	'	$300,000	'

Earnings_per_Unit_and_Cash_Dis2

Earnings per Unit and Cash Distributions - Schedule of Calculations of Basic and Diluted Earnings per Unit (Detail) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

In Thousands, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Aug. 14, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Post IPO Net Income Attributable to the Members of KNOT Offshore Partners LP [Member]

Post IPO Net Income Attributable to the Members of KNOT Offshore Partners LP [Member]

Post IPO Net Income Attributable to the Members of KNOT Offshore Partners LP [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Earnings Per Share Basic And Diluted [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Less: Distribution paid

$9,945

$5,547

'

'

$21,954

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$9,900

'

'

'

Net income (loss)

-7,448

-1,204

'

-8,639

'

2,497

4,343

8,921

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Under (over) distributed earnings attributable to:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Under (over) distributed earnings to limited partners

2,447

'

3,892

8,744

789

'

'

'

-4,788

'

'

-5,371

-2,511

-1,204

'

-3,095

'

'

'

'

'

'

'

'

Under (over) distributed earnings to general partners

$50

'

$79

$177

$16

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average units outstanding (basic and diluted)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average units outstanding, basic and diluted

'

'

'

'

'

'

'

'

8,719

8,568

'

8,643

8,568

8,568

'

8,568

353

350

'

351

'

'

'

'

Earnings per unit (basic and diluted):

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings per unit, basic and diluted

'

'

'

'

'

'

'

'

$0.14

[1]

$0.32

$0.32

[1]

$0.51

[1]

$0.14

[1]

$0.18

$0.18

[1]

$0.51

[1]

$0.14

[1]

$0.32

$0.32

[1]

$0.51

[1]

'

'

'

'

Cash distributions declared and paid in the period per unit

$0.44

'

'

$0.44

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.44

$0.44

$0.32

$0.44

[1]

Earnings per unit information for the three months ended June 30, 2013 is in respect of the period from the date of the Partnership's IPO (April 15, 2013) to June 30, 2013.

Earnings_per_Unit_and_Cash_Dis3

Earnings per Unit and Cash Distributions - Schedule of Calculations of Basic and Diluted Earnings per Unit (Parenthetical) (Detail) (USD $)

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Apr. 15, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

KNOT [Member]

Earnings Per Share Basic And Diluted [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Cash distributions to IDR holders

$9,945

$5,547

'

$21,954

'

'

'

'

$10

$0

$20

$0

Net income attributable to IDRs

'

'

'

'

$0

$0.01

$0

$0.02

'

'

'

'

Earnings_per_Unit_and_Cash_Dis4

Earnings per Unit and Cash Distributions - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 27, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Apr. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 15, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Minimum Quarterly Distribution [Member]

Annual Distribution [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Common Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

Subordinated Units [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

General Partner Unit [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

IDR Holders [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Target Distribution Thereafter [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

Additional Available Cash From Operating Surplus [Member]

First Target Distribution [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Target Distribution Thereafter [Member]

Second Target Distribution [Member]

Third Target Distribution [Member]

Target Distribution Thereafter [Member]

Distribution Made to Limited Partner [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income attributable to IDRs

'

'

'

'

'

'

'

'

'

'

'

'

$0.14

[1]

$0.32

$0.32

[1]

$0.51

[1]

'

'

$0.14

[1]

$0.18

$0.18

[1]

$0.51

[1]

'

'

$0.14

[1]

$0.32

$0.32

[1]

$0.51

[1]

'

'

'

'

'

'

'

$0

$0.01

$0

$0.02

'

'

'

Percentage of limited partner interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

59.40%

'

'

'

'

'

38.60%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of common units outstanding

'

'

'

'

'

'

'

'

'

'

'

'

13,167,500

'

'

13,167,500

'

'

8,567,500

'

'

8,567,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of partnership's units

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of interest held by general partner

2.00%

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of general partner units outstanding

'

443,571

443,571

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution, per unit

'

'

'

'

'

'

$0.38

$1.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of operating surplus distributed to unitholders

'

'

'

'

'

'

'

'

98.00%

85.00%

75.00%

50.00%

'

'

'

'

98.00%

98.00%

'

'

'

'

98.00%

'

'

'

'

2.00%

2.00%

2.00%

2.00%

2.00%

2.00%

2.00%

2.00%

'

'

'

'

13.00%

23.00%

48.00%

Distributions to each unitholder, Per unit

'

$0.44

$0.44

$0.43

$0.47

$0.56

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.02

'

'

'

[1]

Earnings per unit information for the three months ended June 30, 2013 is in respect of the period from the date of the Partnership's IPO (April 15, 2013) to June 30, 2013.

Business_Acquisitions_Addition

Business Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Loans At Acquisition Date [Line Items]	'	'
Business acquisition, fair value of vessel and equipment acquired	'	$0
Common units issued	'	4,600,000
Purchase price,Working capital adjustments	1,000,000	'
Hilda Knutsen [Member]	'	'
Loans At Acquisition Date [Line Items]	'	'
Business acquisition, percentage of interest acquired	100.00%	100.00%
Business acquisition, fair value of vessel and equipment acquired	166,000,000	166,000,000
Business acquisition,outstanding debt	109,600,000	109,600,000
Torill Knutsen [Member]	'	'
Loans At Acquisition Date [Line Items]	'	'
Business acquisition, fair value of vessel and equipment acquired	169,000,000	169,000,000
Business acquisition,outstanding debt	$112,100,000	$112,100,000

Business_Acquisitions_Schedule

Business Acquisitions - Schedule of Fair Values Allocated to Each Class of Identifiable Assets in Carmen Knutsen Acquisition and Difference between Purchase Price and Net Assets Acquired (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Loans At Acquisition Date [Line Items]	'	'
Purchase consideration	$114,293	'
Less: Fair value of net assets acquired:	'	'
Vessel and equipment	0	'
Goodwill	6,217	5,750
Hilda Knutsen And Torill Knutsen [Member]	'	'
Loans At Acquisition Date [Line Items]	'	'
Purchase consideration	114,293	'
Less: Fair value of net assets acquired:	'	'
Vessel and equipment	335,000	'
Cash	8,997	'
Inventories	395	'
Others current assets	1,939	'
Amounts due from related parties	4	'
Long-term debt	-221,812	'
Other long-term liabilities	-4,774	'
Derivatives liabilities	-348	'
Trade accounts payable	-390	'
Accrued expenses	-1,360	'
Prepaid charter and deferred revenue	-1,487	'
Amounts due to related parties	-2,338	'
Sub total	113,826	'
Difference between the purchase price and fair value of net assets acquired	467	'
Goodwill	467	'
Difference between the purchase price and allocated values	'	'

Business_Acquisitions_Schedule1

Business Acquisitions - Schedule of Fair Values Allocated to Each Class of Identifiable Assets in Carmen Knutsen Acquisition and Difference between Purchase Price and Net Assets Acquired (Parenthetical) (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]	'
Cash consideration paid to KNOT	$113,306
Purchase price adjustments	987
Total purchase consideration	$114,293

Business_Acquisitions_Schedule2

Business Acquisitions - Schedule of Summarized Consolidated Pro Forma Financial Information (Detail) (Carmen Knutsen [Member], USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Carmen Knutsen [Member]	'
Loans At Acquisition Date [Line Items]	'
Revenue	$67,074
Net income	$16,096

Equity_Offerings_Schedule_of_E

Equity Offerings - Schedule of Equity Offerings (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Equity [Abstract]	'	'
Gross proceeds received	$133,447	'
Less: Underwriters' discount	4,381	'
Less: Offering expenses	315	2,201
Net proceeds received	$128,751	'

Equity_Offerings_Schedule_of_E1

Equity Offerings - Schedule of Equity Offerings (Parenthetical) (Detail)	0 Months Ended	6 Months Ended
	Jun. 27, 2014	Jun. 30, 2014
Equity [Abstract]	'	'
General Partner's proportional capital contribution, percentage	2.00%	2.00%

Equity_Offerings_Additional_In

Equity Offerings - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended					6 Months Ended
	Jun. 27, 2014	Apr. 30, 2013	Jun. 30, 2014	Jun. 27, 2014	Jul. 24, 2014	Jul. 14, 2014	Jun. 27, 2014	Jun. 30, 2014	Jun. 30, 2014
					Subsequent Event [Member]	Subsequent Event [Member]	Common Units [Member]	KNOT [Member]	KNOT [Member]
								Maximum [Member]	Minimum [Member]
Subsidiary or Equity Method Investee [Line Items]	'	'	'	'	'	'	'	'	'
Limited partnership common units sold	'	'	4,600,000	'	'	'	4,600,000	'	'
Issuance of additional partnership common units	'	'	'	690,000	'	'	690,000	'	'
Period of option granted to underwriters to purchase additional units	'	'	'30 days	'	'	'	'	'	'
Aggregate additional general partner capital contribution	'	'	$400,000	$2,700,000	'	'	'	'	'
General partner interest in Partnership, percentage	2.00%	'	2.00%	'	'	'	'	'	'
Net proceeds from public offering and related General Partner's contribution	'	'	$128,751,000	'	'	'	'	'	'
General partner's interest, percentage	'	49.00%	'	'	'	'	'	51.00%	41.00%
Partnership units issued	'	'	'	'	490,000	150,000	'	'	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

Jun. 27, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 27, 2014

Aug. 14, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jul. 24, 2014

Jul. 14, 2014

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Partnership units issued

'

'

'

'

'

'

'

'

'

'

490,000

150,000

Aggregate additional general partner capital contribution

'

$400,000

'

$400,000

'

$2,700,000

'

'

'

'

'

'

General partner interest in Partnership, percentage

2.00%

'

'

2.00%

'

'

'

'

'

'

'

'

Cash distribution paid, date paid

'

'

'

14-Aug-14

'

'

'

'

'

'

'

'

Cash distribution paid, per unit

'

$0.44

'

$0.44

'

'

$0.44

$0.44

$0.32

$0.44

'

'

Cash distribution

'

$9,945,000

$5,547,000

'

$21,954,000

'

$9,900,000

'

'

'

'

'