Goodwill and Other Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill
Balance - beginning of period	$ 350,208
Goodwill, acquired	348,876
Other adjustments accounted for as business combinations (a)	14,137
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	(2,743)
Foreign currency translation adjustments and other	(7,687)
Balance - end of period	702,791
Real Estate Ownership
Goodwill
Balance - beginning of period	286,601
Goodwill, acquired	348,876
Other adjustments accounted for as business combinations (a)	14,137
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	(2,743)
Foreign currency translation adjustments and other	(7,687)
Balance - end of period	639,184
Investment Management
Goodwill
Balance - beginning of period	63,607
Goodwill, acquired	0
Other adjustments accounted for as business combinations (a)	0
Allocation of goodwill to the cost basis of properties sold or classified as held-for-sale	0
Foreign currency translation adjustments and other	0
Balance - end of period	$ 63,607