Consolidated Statements of Operations and Comprehensive Loss (USD $)	6 Months Ended		12 Months Ended
	Dec. 31, 2010	Jun. 25, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue
Management and leasing fees			$ 12,570,000	$ 8,913,000	$ 9,026,000
Management and leasing fees — related party			14,546,000	12,417,000	10,138,000
Commissions			5,777,000	6,359,000	4,204,000
Commissions — related party			24,183,000	5,375,000	727,000
Sale of real estate			417,000	3,937,000	52,699,000
Sale of real estate — related party			0	9,535,000	6,698,000
Rental and other income			5,140,000	4,000,000	2,743,000
Interest income from loan pool participations and notes receivable			7,886,000	11,855,000	0
Total revenues			62,633,000	50,536,000	86,235,000
Operating Expenses [Abstract]
Rental operating expenses			3,308,000	1,913,000	1,148,000
Compensation and related expenses			41,129,000	38,155,000	24,789,000
General and administrative			14,455,000	11,314,000	6,351,000
Depreciation and amortization			2,798,000	1,618,000	1,122,000
Amortization			812,000	262,000	917,000
Commission and marketing expenses			3,965,000	3,186,000	3,411,000
Total operating expenses			66,052,000	69,937,000	94,872,000
Equity in joint venture (loss) income			12,507,000	10,548,000	8,019,000
Merger-related general and administrative			0	0	3,652,000
Merger-related compensation and related expenses			0	2,225,000	12,468,000
Cost of real estate sold			397,000	2,714,000	36,179,000
Cost of real estate sold — related party			0	8,812,000	5,752,000
Operating income (loss)			16,974,000	3,002,000	(618,000)
Non-operating income (expense)
Interest income			285,000	192,000	102,000
Interest income — related party			2,021,000	662,000	400,000
Remeasurement gain			6,348,000	2,108,000	0
Gain on extinguishment of debt			0	16,670,000	0
Loss on extinguishment of debt			0	(4,788,000)	0
Interest			20,507,000	7,634,000	13,174,000
Other than temporary impairment			0	0	(328,000)
Income (loss) before benefit from (provision for) income taxes			5,121,000	10,212,000	(13,618,000)
Benefit from (provision for) income taxes			2,014,000	(3,727,000)	3,961,000
Income (loss) from continuing operations			7,135,000	6,485,000	(9,657,000)
Income from discontinued operations, net of income taxes			8,000	0	0
Gain from sale of real estate			335,000	0	0
Net (loss) income			7,478,000	6,485,000	(9,657,000)
Net (loss) income attributable to the noncontrolling interests			(1,132,000)	(2,979,000)	(5,679,000)
Net income (loss) attributable to Kennedy-Wilson Holdings, Inc.			6,346,000	3,506,000	(15,336,000)
Preferred dividends and accretion of preferred stock issuance costs			(8,744,000)	(4,558,000)	0
Net (loss) income attributable to Kennedy-Wilson Holdings, Inc. common shareholders			(2,398,000)	(1,052,000)	(15,336,000)
Other comprehensive income:
Foreign currency translation			1,508,000	6,434,000	2,407,000
Other comprehensive (loss) income, net of tax			(4,008,000)	6,440,000	2,601,000
Total comprehensive (loss) income			(6,406,000)	5,388,000	(12,735,000)
Basic and diluted (loss) income per share
Continuing operations, per basic share			$ (0.06)	$ (0.03)	$ (0.57)
Continuing operations, per diluted share			$ (0.14)	$ (0.03)	$ (0.57)
Discontinued operations, net of income taxes, per basic share			$ 0.01	$ 0.00	$ 0.00
Discontinued operations, net of tax, per diluted share			$ 0.01	$ 0.00	$ 0.00
Basic (loss) income attributable to Kennedy-Wilson Holdings, Inc. common shareholders			$ (0.05)	$ (0.03)	$ (0.57)
Weighted average number of common shares outstanding			42,415,770	38,978,272	26,891,304
Dividends declared per common share			$ 0.11	$ 0.00	$ 0.00
Bay Fund Opportunity [Member]
Revenue
Rent			7,711,417	7,293,504	7,355,693
Other Income			831,948	1,083,479	560,141
Total revenues			8,543,365	8,376,983	7,915,834
Operating Expenses [Abstract]
Property taxes			1,185,142	1,620,627	1,823,090
Association fees			1,850,042	1,820,321	1,809,891
Repairs & maintenance			530,743	516,429	671,141
Management fees			510,427	620,616	621,925
Insurance			56,981	53,871	105,717
General and administrative			68,977	210,182	44,274
Depreciation and amortization			2,277,048	2,273,816	2,273,829
Amortization			184,802	95,626	95,624
Commission and marketing expenses			141,646	145,945	25,345
Letter of credit fees			67,764	72,165	0
Total operating expenses			9,364,978	10,346,431	10,457,354
Non-operating income (expense)
Interest			2,676,208	3,012,459	3,082,142
Net (loss) income			(821,613)	(1,969,448)	(2,541,520)
Net (loss) income attributable to the noncontrolling interests			553,885	2,004,070	5,436,077
Net income (loss) attributable to Kennedy-Wilson Holdings, Inc.			(267,728)	34,622	2,894,557
KW Fund III [Member]
Revenue
Dividends			4,026,719	3,325,350	2,593,757
Total investment income			4,610,552	4,008,212	3,231,715
Operating Expenses [Abstract]
Management fees paid to related party			1,658,333	3,554,005	744,089
Acquisition fees paid to related party			(326,501)	(412,487)	(496,347)
General and administrative			409,258	335,975	1,188,907
Interest expense - related party (note 4)			0	93,750	20,899
Legal fees				152,761	729,553
Total operating expenses			2,067,591	4,329,720	3,239,683
Operating income (loss)			2,542,961	(321,508)	(7,968)
Non-operating income (expense)
Interest income			583,833	682,862	507,173
Interest income — related party			0	0	130,785
Interest			0	193,229	556,235
Net realized gain on investments			0	0	377,292
Net change in unrealized appreciation on investments			3,796,169	7,116,258	13,674,702
Net (loss) income			6,339,130	6,794,750	14,044,026
KW WDC/Carlsbad [Member]
Non-operating income (expense)
Net (loss) income	6,903,913	(9,880,525)	205,502		(4,010,008)
KW WDC/Carlsbad [Member] | Successor [Member]
Revenue
Rent			11,376,758	11,960,906
Other Income			1,063,564	974,450
Total revenues			12,440,322	12,935,356
Operating Expenses [Abstract]
Property taxes			1,229,763	1,220,748
Utilities			1,218,543	1,133,723
Association fees			14,447	16,054
Repairs & maintenance			1,140,712	1,151,873
Management fees paid to related party			482,414	496,681
Acquisition fees paid to related party			0	442,315
Insurance			310,985	280,219
General and administrative			1,091,910	1,119,093
Depreciation and amortization			2,606,297	4,485,763
Depreciation and amortization			2,606,297	4,461,879
Bad debt expense			(27,946)	6,235
Commission and marketing expenses			121,000	153,016
Other property operating expenses			307,579	245,546
Total operating expenses			12,234,820	16,616,669
Revaluation loss on change in ownership			0	(8,386,821)
Non-operating income (expense)
Gain on extinguishment of debt			0	9,091,522
Interest			3,739,116	5,889,287
Net (loss) income			205,502	(2,976,612)
KW WDC/Carlsbad [Member] | Predecessor [Member]
Revenue
Rent					12,369,330
Other Income					541,672
Total revenues					12,911,002
Operating Expenses [Abstract]
Property taxes					1,643,230
Utilities					1,108,619
Association fees					14,372
Repairs & maintenance					1,396,658
Management fees paid to related party					508,202
Acquisition fees paid to related party					0
Insurance					283,906
General and administrative					773,996
Depreciation and amortization					4,252,744
Depreciation and amortization					4,208,445
Bad debt expense					12,579
Commission and marketing expenses					240,702
Other property operating expenses					165,974
Total operating expenses					16,921,010
Revaluation loss on change in ownership					0
Non-operating income (expense)
Gain on extinguishment of debt					0
Interest					6,564,327
Net (loss) income					(4,010,008)
KWF Venture VI [Member]
Revenue
Interest income from loan pool participations and notes receivable			3,660,262
Operating Expenses [Abstract]
General and administrative			1,236
Total operating expenses			3,149,164
Non-operating income (expense)
Interest			3,147,928
Net (loss) income			511,098
Other comprehensive income:
Foreign currency translation			(3,671,015)
Other comprehensive (loss) income, net of tax			(3,671,015)
Total comprehensive (loss) income			(3,159,917)
KW Residential [Member]
Revenue
Management and leasing fees			0	268,381	115,318
Rent			37,770,902	34,515,674	32,634,808
Total revenues			37,770,902	34,784,055	32,750,126
Operating Expenses [Abstract]
Rental operating expenses			10,003,392	10,387,147	8,543,655
Compensation and related expenses			1,589,701	2,943,106	2,736,620
General and administrative			3,132,436	2,202,892	2,132,458
Depreciation and amortization			11,604,181	11,115,370	12,020,989
Amortization			3,803,447	4,308,948	5,131,237
Total operating expenses			26,329,710	26,648,515	25,433,722
Operating income (loss)			11,441,192	8,135,540	7,316,404
Non-operating income (expense)
Gain on extinguishment of debt			0	0	28,319,523
Interest			(12,227,111)	(12,234,711)	(14,828,431)
Other			296,636	270,432	(3,984,175)
Income (loss) before benefit from (provision for) income taxes			(489,283)	(3,828,739)	16,823,321
Benefit from (provision for) income taxes			525,110	657,487	(36,694)
Net (loss) income			(1,014,393)	(4,486,226)	16,860,015
Other comprehensive income:
Foreign currency translation			14,784,853	35,077,607	(4,488,486)
Forward foreign currency loss			(8,838,828)	(6,609,056)	0
Other comprehensive (loss) income, net of tax			5,946,025	28,468,551	(4,488,486)
Total comprehensive (loss) income			4,931,632	23,982,325	12,371,529
BASGF [Member]
Operating Expenses [Abstract]
Management fees			674,470	656,242	665,356
General and administrative			106,667	119,170	92,878
Total operating expenses			838,523	827,688	758,234
Equity in joint venture (loss) income			(604,819)	(404,058)	1,230,049
Operating income (loss)			(1,443,342)	(1,231,746)	471,815
Realized loss on disposition of investment in unconsolidated real estate entity (note 3)			(2,359,686)	0	0
Non-operating income (expense)
Interest			57,386	52,276	0
Net (loss) income			(3,803,028)	(1,231,746)	471,815
KW America and Santee Village [Member]
Revenue
Rent			12,645,562	12,689,501
Other Income			1,121,312	1,180,277
Total revenues			13,766,874	13,869,778
Operating Expenses [Abstract]
Property taxes			1,801,700	1,936,995
Utilities			795,273	826,062
Repairs & maintenance			956,658	973,968
Management fees			459,237	459,140
Insurance			243,669	230,619
General and administrative			1,058,481	1,148,078
Depreciation and amortization			2,948,110	3,983,070
Depreciation			2,948,111	3,774,149
Bad debt expense			(10,578)	3,571
Commission and marketing expenses			113,482	183,251
Other property operating expenses			315,962	596,456
Total operating expenses			16,371,513	18,030,728
Equity in joint venture (loss) income			977,198	(217,423)
Revaluation loss on change in ownership			0	(17,499,321)
Non-operating income (expense)
Interest			7,689,518	7,689,518
Net (loss) income	(1,965,721)	(19,911,973)	(1,627,441)	(21,877,694)	(5,013,944)
SJ Real Estate [Member]
Revenue
Rental and other income			1,678,068	0
Other Income			130,329	0
Total revenues			1,808,397	0
Operating Expenses [Abstract]
Property taxes			888,929	0
Property operations			729,732	0
Management fees			79,000	0
General and administrative			639,317	50,497
Depreciation			1,999,540	0
Amortization			597,960	99,650
Bad debt expense			500	0
Other property operating expenses			173,324	0
Total operating expenses			10,383,587	1,104,897
Non-operating income (expense)
Gain on foreclosure			15,385,558	0
Interest			5,275,785	954,750
Net (loss) income			6,810,368	(1,104,897)
One Carlsbad [Member] | KW WDC/Carlsbad [Member]
Non-operating income (expense)
Net (loss) income	3,149,526	0	(531,359)		(707,687)
One Carlsbad [Member] | KW WDC/Carlsbad [Member] | Successor [Member]
Revenue
Rent				1,626,181
Other Income				36,827
Total revenues				1,663,008
Operating Expenses [Abstract]
Property taxes				183,579
Utilities				67,165
Association fees				16,054
Repairs & maintenance				225,935
Management fees paid to related party				46,871
Acquisition fees paid to related party				0
Insurance				27,740
General and administrative				120,071
Depreciation and amortization				712,344
Depreciation and amortization				688,460
Bad debt expense				0
Commission and marketing expenses				5,917
Other property operating expenses				0
Total operating expenses				2,013,482
Revaluation loss on change in ownership				0
Non-operating income (expense)
Gain on extinguishment of debt				3,500,000
Interest				631,690
Net (loss) income				3,149,526
Santee Village [Member] | KW America and Santee Village [Member]
Revenue
Rent				0
Other Income				0
Total revenues				0
Operating Expenses [Abstract]
Property taxes				0
Utilities				0
Repairs & maintenance				0
Management fees				0
Insurance				0
General and administrative				0
Depreciation and amortization				0
Depreciation				0
Bad debt expense				0
Commission and marketing expenses				0
Other property operating expenses				0
Total operating expenses				0
Equity in joint venture (loss) income				(217,423)
Revaluation loss on change in ownership				0
Non-operating income (expense)
Interest				0
Net (loss) income	(217,423)	0	977,198	(217,423)	0
KW America [Member] | KW America and Santee Village [Member]
Non-operating income (expense)
Net (loss) income	(1,748,298)	(19,911,973)	(2,604,639)		(5,013,944)
KW America [Member] | KW America and Santee Village [Member] | Successor [Member]
Revenue
Rent	6,380,477
Other Income	577,548
Total revenues	6,958,025
Operating Expenses [Abstract]
Property taxes	910,777
Utilities	476,891
Repairs & maintenance	494,446
Management fees	231,364
Insurance	119,902
General and administrative	579,594
Depreciation and amortization	1,435,520
Depreciation	1,226,602
Bad debt expense	(3,349)
Commission and marketing expenses	85,510
Other property operating expenses	514,689
Total operating expenses	8,706,323
Equity in joint venture (loss) income	0
Revaluation loss on change in ownership	0
Non-operating income (expense)
Interest	3,860,979
Net (loss) income	(1,748,298)
KW America [Member] | KW America and Santee Village [Member] | Predecessor [Member]
Revenue
Rent		6,309,024			13,105,319
Other Income		602,729			617,299
Total revenues		6,911,753			13,722,618
Operating Expenses [Abstract]
Property taxes		1,026,218			1,991,407
Utilities		349,171			769,885
Repairs & maintenance		479,522			1,343,749
Management fees		227,776			465,668
Insurance		110,717			233,453
General and administrative		568,483			691,531
Depreciation and amortization		2,547,550			4,961,580
Depreciation		2,547,547			4,961,580
Bad debt expense		6,920			177,989
Commission and marketing expenses		97,741			276,107
Other property operating expenses		81,767			135,674
Total operating expenses		9,324,405			18,736,562
Equity in joint venture (loss) income		0			0
Revaluation loss on change in ownership		(17,499,321)			0
Non-operating income (expense)
Interest		3,828,539			7,689,519
Net (loss) income		(19,911,973)			(5,013,944)
KW WDC Portfolio [Member] | KW WDC/Carlsbad [Member]
Non-operating income (expense)
Net (loss) income	3,754,387	(9,880,525)	736,861		(3,302,321)
KW WDC Portfolio [Member] | KW WDC/Carlsbad [Member] | Successor [Member]
Revenue
Rent	5,123,097
Other Income	491,096
Total revenues	5,614,193
Operating Expenses [Abstract]
Property taxes	398,238
Utilities	579,349
Association fees	0
Repairs & maintenance	480,259
Management fees paid to related party	225,095
Acquisition fees paid to related party	442,315
Insurance	122,204
General and administrative	517,910
Depreciation and amortization	2,128,829
Depreciation and amortization	2,128,829
Bad debt expense	2,983
Commission and marketing expenses	61,194
Other property operating expenses	133,199
Total operating expenses	7,451,328
Revaluation loss on change in ownership	0
Non-operating income (expense)
Gain on extinguishment of debt	5,591,522
Interest	2,359,754
Net (loss) income	3,754,387
KW WDC Portfolio [Member] | KW WDC/Carlsbad [Member] | Predecessor [Member]
Revenue
Rent		5,211,628
Other Income		446,527
Total revenues		5,658,155
Operating Expenses [Abstract]
Property taxes		638,931
Utilities		487,209
Association fees		0
Repairs & maintenance		445,679
Management fees paid to related party		224,715
Acquisition fees paid to related party		0
Insurance		130,275
General and administrative		481,113
Depreciation and amortization		1,644,590
Depreciation and amortization		1,644,590
Bad debt expense		3,252
Commission and marketing expenses		85,905
Other property operating expenses		112,347
Total operating expenses		7,151,859
Revaluation loss on change in ownership		(8,386,821)
Non-operating income (expense)
Gain on extinguishment of debt		0
Interest		2,897,843
Net (loss) income		$ (9,880,525)