Consolidated Balance Sheets (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Cumulative preferred stock subject to mandatory redemption Series A [Member]	Dec. 31, 2010 Cumulative preferred stock subject to mandatory redemption Series A [Member]	Dec. 31, 2011 Cumulative preferred stock subject to mandatory redemption Series B [Member]	Dec. 31, 2010 Cumulative preferred stock subject to mandatory redemption Series B [Member]	Dec. 31, 2011 Bay Fund Opportunity [Member]	Dec. 31, 2010 Bay Fund Opportunity [Member]	Dec. 31, 2011 KW Fund III [Member]	Dec. 31, 2010 KW Fund III [Member]	Dec. 31, 2011 KW WDC/Carlsbad [Member]	Dec. 31, 2010 KW WDC/Carlsbad [Member]	Dec. 31, 2011 KWF Venture VI [Member]	Dec. 31, 2011 KW Residential [Member]	Dec. 31, 2010 KW Residential [Member]	Dec. 31, 2011 BASGF [Member]	Dec. 31, 2010 BASGF [Member]	Dec. 31, 2011 KW America and Santee Village [Member]	Dec. 31, 2010 KW America and Santee Village [Member]	Dec. 31, 2011 SJ Real Estate [Member]	Dec. 31, 2010 SJ Real Estate [Member]
Real estate:
Land							$ 21,874,072	$ 21,874,072			$ 27,186,788	$ 27,159,471						$ 36,626,959	$ 36,626,959	$ 10,835,200	$ 0
Buildings											82,892,252	82,892,252						109,880,877	109,880,877
Building improvements											4,068,665	1,639,055						886,104	417,546
Buildings and improvements							87,566,335	87,566,335												99,960,855	0
Furniture and equipment							714,011	605,000			17,995	4,520						7,090	0	1,244,134	0
Total							110,154,418	110,045,407			114,165,700	111,695,298						147,401,030	146,925,382	112,040,189	0
Accumulated depreciation							(8,043,048)	(5,766,000)			(6,074,754)	(3,607,310)						(4,383,630)	(1,435,520)	(1,999,540)	0
Real estate, net							102,111,370	104,279,407			108,090,946	108,087,988						143,017,400	145,489,862	110,040,649	0
Participation interest in notes receivable (see note 3)													344,831,165
Investments at fair value (cost $105,952,148 in 2011 and $81,311,936 in 2010)									135,821,252	107,384,873
Rental property, net														627,316,328	609,430,001
Cash											533,632	1,635,712						524,197	386,837	329,194	2,942,866
Cash and cash equivalents	115,926,000	46,968,000					1,019,796	360,150	88,397	23,611,792			343,538	6,587,593	5,216,811	18,803	100	524,197	386,837	329,194	2,942,866
Restricted cash														22,449,178	21,575,193
Accounts receivable — related parties	15,612,000	7,062,000
Notes receivable	7,938,000	20,264,000																		0	90,893,185
Notes receivable — related parties	33,269,000	3,837,000
Real estate, net	115,880,000	82,701,000
Investments in loan pool participations	89,951,000	25,218,000
Marketable securities	23,005,000	33,000
Goodwill	23,965,000	23,965,000
Reserves													98,229
Investments in joint ventures	343,367,000	266,853,000														20,814,601	27,995,239	1,455,948	2,305,749
Repair and replacement reserves held in escrow							727,364	784,640			2,211,881	3,275,442						5,876	16,741
Real estate taxes and insurance reserves held in escrow							303,964	322,294	0	1,171,372	427,415	387,073						1,153,386	1,432,266	1,118,046	856,858
Deferred financing costs, net of accumulated depreciation							380,760	237,731			732,479	808,621								498,194	1,096,154
Due from limited partners									246,665	246,665
Deferred leasing costs, net of accumulated amortization of $579,834 and $524,825, respectively											176,660	231,669
Accounts receivable	3,114,000	2,097,000					47,157	72,134	44,480	27,009	73,286	40,843		804,844	869,823	1,209,428	0	54,298	81,198	7,754	0
Accrued rent											200,629	101,489
Prepaid expenses and other assets							43,703	42,558	440,343	476,730	369,613	289,151				172,996	15,125	117,160	235,704	174,595	0
Other assets	20,749,000	8,850,000												18,268,947	9,700,612
Total assets	792,776,000	487,848,000					104,634,114	106,098,914	136,641,137	132,918,441	112,816,541	114,857,988	345,272,932	675,426,890	646,792,440	22,215,828	28,010,464	146,328,265	149,948,357	112,168,432	95,789,063
Liabilities
Accounts payable	1,798,000	1,504,000											1,086
Accrued expenses and other liabilities	24,262,000	9,064,000														0	1,043,930
Accrued salaries and benefits	14,578,000	10,721,000
Accrued interest payable													376,093
Senior notes payable	249,385,000	0											225,656,250
Notes payable	0	24,783,000
Borrowings under line of credit	0	27,750,000
Mortgage Loans Payable	30,748,000	35,249,000					58,890,863	65,249,799			81,530,632	81,543,725		343,170,004	338,227,939			135,750,000	135,750,000	67,000,000	67,000,000
Junior subordinated debentures	40,000,000	40,000,000
Derivative liability														15,447,884	6,609,056
Accrued and deferred tax liability	18,437,000	25,871,000												340,216	381,691
Accounts payable and accrued expenses							1,483,085	2,253,923	0	182,207	630,903	818,680		6,387,375	7,204,729			744,735	764,266	384,693	893,960
Reserve for future warranty claims							392,000	392,000
Due to General Partner									2,062,244	2,520,001
Note payable to affiliate (note 4)																0	947,678
Security deposits and other liabilities							397,235	408,703			662,544	699,096		4,383,780	4,239,973			712,901	584,920
Prepaid rent							3,121	5,066
Other liabilities														59,663	21,877					593,268	0
Total liabilities	379,208,000	174,942,000					61,166,304	68,309,491	2,062,244	2,702,208	82,824,079	83,061,501	226,033,429	369,788,922	356,685,265	0	1,991,608	137,207,636	137,099,186	67,977,961	67,893,960
Cumulative preferred stock, $0.0001 par value: 1,000,000 shares authorized $1,000 per share liquidation preference,
Convertible preferred stock			0	0	0	0
Common stock, $0.0001 par value	5,000	4,000
Additional paid-in capital	407,335,000	284,669,000
Common stock held in treasury, at cost, $0.0001 par value	(11,848,000)	(11,301,000)
Total Kennedy-Wilson Holdings, Inc. shareholders' equity	410,235,000	300,192,000
Noncontrolling interests	3,333,000	12,714,000					0	553,885
Limited partners									113,929,918	110,038,884			61,199,710
General partner and special limited partner									20,648,975	20,177,349
Contributed capital													61,199,710	235,600,315	225,001,154
Retained earnings	9,708,000	17,777,000											511,098	6,539,799	7,554,192
Accumulated other comprehensive income	5,035,000	9,043,000											(3,671,015)	63,497,854	57,551,829
Equity							43,467,810	37,235,538			29,992,462	31,796,487						9,120,629	12,849,171
Total equity	413,568,000	312,906,000					43,467,810	37,789,423	134,578,893	130,216,233	29,992,462	31,796,487	119,239,503	305,637,968	290,107,175	22,215,828	26,018,856	9,120,629	12,849,171	44,190,471	27,895,103
Total liabilities and equity	$ 792,776,000	$ 487,848,000					$ 104,634,114	$ 106,098,914	$ 136,641,137	$ 132,918,441	$ 112,816,541	$ 114,857,988	$ 345,272,932	$ 675,426,890	$ 646,792,440	$ 22,215,828	$ 28,010,464	$ 146,328,265	$ 149,948,357	$ 112,168,432	$ 95,789,063