GUARANTOR AND NON-GUARANTOR FINANCIAL STATEMENTS (Comprehensive Income) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	$ 20,600,000	$ (2,700,000)	$ (1,300,000)	$ (2,600,000)	$ 10,300,000	$ (4,100,000)	$ (1,000,000)	$ 1,500,000	$ 13,900,000	$ 6,700,000		$ 7,500,000
Foreign currency translation gain (loss), net of tax									(9,300,000)	(1,500,000)		1,500,000
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax									0	3,300,000		(3,200,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									2,800,000	0		0
Unrealized forward contract forward currency gain (loss)									2,100,000	3,700,000		1,500,000
Unrealized forward contract foreign currency gain (loss)									3,100,000	5,700,000		(2,300,000)
Total other comprehensive (loss) income for the period									(3,400,000)	7,500,000		(4,000,000)
Comprehensive (loss) income									10,500,000	14,200,000		3,500,000
Comprehensive income attributable to noncontrolling interests									(20,300,000)	(2,600,000)		(1,100,000)
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									(9,800,000)	11,600,000		2,400,000
Consoldiated Entity Ownership Percentage												100.00%	100.00%
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									13,900,000	6,900,000		7,400,000
Foreign currency translation gain (loss), net of tax									(9,300,000)	(1,500,000)		1,500,000
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax										3,300,000		(3,200,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									2,800,000
Unrealized forward contract foreign currency gain (loss)									3,100,000	5,700,000		(2,300,000)
Total other comprehensive (loss) income for the period									(3,400,000)	7,500,000		(4,000,000)
Comprehensive (loss) income									10,500,000	14,400,000		3,400,000
Comprehensive income attributable to noncontrolling interests
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									10,500,000	14,400,000		3,400,000
Kennedy-Wilson, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									21,700,000	14,900,000		12,500,000
Foreign currency translation gain (loss), net of tax									(9,300,000)	(1,500,000)		1,500,000
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax										3,300,000		(3,200,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									2,800,000
Unrealized forward contract foreign currency gain (loss)									3,100,000	5,700,000		(2,300,000)
Total other comprehensive (loss) income for the period									(3,400,000)	7,500,000		(4,000,000)
Comprehensive (loss) income									18,300,000	22,400,000		8,500,000
Comprehensive income attributable to noncontrolling interests												(100,000)
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									18,300,000	22,400,000		8,400,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									105,400,000	66,300,000		51,200,000
Foreign currency translation gain (loss), net of tax									(10,000,000)	(2,200,000)	[1]	2,000,000
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax											[1]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									2,800,000
Unrealized forward contract foreign currency gain (loss)									5,000,000	6,400,000	[1]	(2,300,000)
Total other comprehensive (loss) income for the period									(2,200,000)	4,200,000	[1]	(300,000)
Comprehensive (loss) income									103,200,000	70,500,000	[1]	50,900,000
Comprehensive income attributable to noncontrolling interests											[1]	(400,000)
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									103,200,000	70,500,000	[1]	50,500,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									51,300,000	38,300,000		28,800,000
Foreign currency translation gain (loss), net of tax									800,000	(300,000)
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									0
Unrealized forward contract foreign currency gain (loss)
Total other comprehensive (loss) income for the period									800,000	(300,000)
Comprehensive (loss) income									52,100,000	38,000,000		28,800,000
Comprehensive income attributable to noncontrolling interests									20,300,000	(2,600,000)		(600,000)
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									31,800,000	35,400,000		28,200,000
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									(178,400,000)	(119,700,000)		(92,400,000)
Foreign currency translation gain (loss), net of tax									18,500,000	4,000,000		(3,500,000)
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on marketable securities, net of tax										(3,300,000)		3,200,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									(5,600,000)
Unrealized forward contract foreign currency gain (loss)									(8,100,000)	(12,100,000)		4,600,000
Total other comprehensive (loss) income for the period									4,800,000	(11,400,000)		4,300,000
Comprehensive (loss) income									(173,600,000)	(131,100,000)		(88,100,000)
Comprehensive income attributable to noncontrolling interests
Comprehensive (loss) income attributable to Kennedy-Wilson Holdings, Inc.									$ (173,600,000)	$ (131,100,000)		$ (88,100,000)

[1] Text selection found with no content.