Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jan. 31, 2013
Fair Value of nonrecourse mortgage debt and notes payable (including land held for divestiture debt), bank revolving credit facility and senior and subordinated debt
Carrying value	$ 5,279,506	$ 6,773,629
Fair value	5,442,542	7,088,223
Fixed Rate Debt [Member]
Fair Value of nonrecourse mortgage debt and notes payable (including land held for divestiture debt), bank revolving credit facility and senior and subordinated debt
Carrying value	3,281,337	4,791,113
Fair value	3,488,406	5,147,849
Variable Rate Debt [Member]
Fair Value of nonrecourse mortgage debt and notes payable (including land held for divestiture debt), bank revolving credit facility and senior and subordinated debt
Carrying value	1,998,169	1,982,516
Fair value	$ 1,954,136	$ 1,940,374