Note 8 - Investment and Advances in Real Estate Joint Ventures (Detail) - Summarized Financial Information for KIR - Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Assets	$ 9,031.0	$ 9,767.8
Liabilities and Members’ Capital:
Noncontrolling interests	19.1	25.4
Members’ capital	3,593.8	3,662.0
	9,031.0	9,767.8
KIR [Member] | Real Estate, Net [Member]
Assets:
Assets	1,134.2	1,177.6
KIR [Member] | Other Assets [Member]
Assets:
Assets	87.7	76.4
KIR [Member] | Mortgage Payable [Member]
Liabilities and Members’ Capital:
Liabilities	914.6	911.5
KIR [Member] | Other Liabilities [Member]
Liabilities and Members’ Capital:
Liabilities	26.8	27.4
KIR [Member]
Assets:
Assets	1,221.9	1,254.0
Liabilities and Members’ Capital:
Noncontrolling interests		10.7
Members’ capital	280.5	304.4
	$ 1,221.9	$ 1,254.0