Organization (Details)	Sep. 30, 2015 state country property	May. 11, 2015	Mar. 31, 2015	Dec. 31, 2014
Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	6
U.S. and Puerto Rico
Owned, developed and managed retail properties
Number of properties	208
Number of U.S. states containing property locations | state	37
U.S. and Puerto Rico | Malls
Owned, developed and managed retail properties
Number of properties	109
U.S. and Puerto Rico | Premium Outlets
Owned, developed and managed retail properties
Number of properties	69
U.S. and Puerto Rico | The Mills
Owned, developed and managed retail properties
Number of properties	14
U.S. and Puerto Rico | Lifestyle/Community Centers
Owned, developed and managed retail properties
Number of properties	3
U.S. and Puerto Rico | Other
Owned, developed and managed retail properties
Number of properties	13
Japan | Premium Outlets
Owned, developed and managed retail properties
Number of properties	9
South Korea | Premium Outlets
Owned, developed and managed retail properties
Number of properties	3
Canada | Premium Outlets
Owned, developed and managed retail properties
Number of properties	2
Canada | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	1
Mexico | Premium Outlets
Owned, developed and managed retail properties
Number of properties	1
Malaysia | Premium Outlets
Owned, developed and managed retail properties
Number of properties	1
Europe | Klepierre
Owned, developed and managed retail properties
Joint venture ownership percentage	20.30%	20.30%	18.30%	28.90%
Number of countries | country	16
Europe | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	5
Italy | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	2
Austria | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	1
Netherlands | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	1
United Kingdom | Premium Outlets | European Joint Venture
Owned, developed and managed retail properties
Number of properties	1