Summary of Significant Accounting Policies and Adoption of New Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION—Performance fees or carried interests are allocated to the general partner, special limited partner or asset manager of Kennedy Wilson's real estate funds and loan pool participations based on the cumulative performance of the funds and loan pools and are subject to preferred return thresholds of the limited partners and participants. At the end of each reporting period, Kennedy Wilson calculates the performance fee that would be due to the general partner, special limited partner or asset manager's interests for a fund or loan pool, pursuant to the fund agreement or participation agreements, as if the fair value of the underlying investments were realized as of such date, irrespective of whether such amounts have been realized. As the fair value of underlying investments varies between reporting periods, it is necessary to make adjustments to amounts recorded as performance fees to reflect either (a) positive performance resulting in an increase in the performance fee allocated to the general partner or asset manager or (b) negative performance that would cause the amount due to Kennedy Wilson to be less than the amount previously recognized as revenue, resulting in a negative adjustment to performance fees allocated to the general partner or asset manager. A majority of the performance fees are recognized in investment management revenue, and substantially all of the carried interest is recognized in income from unconsolidated investments in our consolidated statements of operations. Total performance fees recognized from inception through March 31, 2014 that may be reversed in future periods if there is negative fund or loan pool performance totaled $9.8 million. Performance fees accrued as of March 31, 2014 and December 31, 2013 were $9.8 million and $6.1 million, respectively, and are included in accounts receivable in the accompanying consolidated balance sheet.
REAL ESTATE ACQUISITIONS	REAL ESTATE ACQUISITIONS—The purchase price of acquired properties is recorded to land, buildings and building improvements and intangible lease value (value of above-market and below-market leases, acquired in-place lease values, and tenant relationships, if any) based on their respective estimated fair values in accordance with Business Combinations ASC Subtopics 805-10. Acquisition-related costs are expensed as incurred. The valuations of real estate are based on management estimates of the real estate assets using income and market approaches. The indebtedness securing the real estate are valued, in part, based on third party valuations and management estimates also using an income approach.
NONCONTROLLING INTERESTS	NONCONTROLLING INTERESTS—Noncontrolling interests are reported within equity as a separate component of Kennedy Wilson's equity in accordance with Noncontrolling Interests in Consolidated Financial Statements ASC Subtopic 810-10. Revenues, expenses, gains, losses, net income or loss, and other comprehensive income are reported in the consolidated statements of operations at the consolidated amounts and net income and comprehensive income attributable to noncontrolling interests are separately stated.
FOREIGN CURRENCIES	FOREIGN CURRENCIES—The financial statements of subsidiaries located outside the United States are measured using the local currency as the functional currency. The assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date, and income and expenses are translated at the average monthly rate. The foreign currencies include the euro, the British pound sterling, and the Japanese yen. Cumulative translation adjustments, to the extent not included in cumulative net income, are included in the consolidated statement of equity as a component of accumulated other comprehensive income.
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDING ACTIVITIES	DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES—All derivative instruments are recognized as either assets or liabilities in the balance sheet at their respective fair values. For derivatives designated in hedging relationships, changes in fair value of cash flow hedges or net investment hedges are recognized in accumulated other comprehensive income, to the extent the derivative is effective at offsetting the changes in the item being hedged until the hedged item affects earnings. Changes in fair value for fair value hedges are recognized in earnings.
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS—On April 10, 2014, the Financial Accounting Standards Board issued ASU 2014-08, which amends the definition of discontinued operations and requires additional disclosures for disposal transactions that do not meet the revised discontinued operations criteria. ASU 2014-08 is required to be adopted for fiscal years beginning after December 15, 2014, with early adoption permitted. The Company's early adoption of this pronouncement on January 1, 2014 did not have a material impact on the Company's consolidated financial statements. The FASB did not issue any other ASCs during the first three months of 2014 that we expect to be applicable and have a material impact on our financial position or results of operations.
RECLASSIFICATIONS	RECLASSIFICATIONS—Certain balances included in prior year's financial statements have been reclassified to conform with the current year's presentation.

Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.

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- Definition

Disclosure of accounting policy for its derivative instruments and hedging activities.

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- Definition

Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.

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- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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