Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest	Series A Preferred Stock	Common Stock Class A	Common Stock Class B
Balance at Jan. 31, 2010	$ 1,519,401	$ 571,189	$ 627,634	$ (154)	$ (87,266)	$ 356,214	$ 0	$ 44,279	$ 7,505
Balance, Shares at Jan. 31, 2010				28,000			0	132,836,000	22,516,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of new consolidation accounting guidance	(74,034)					(74,034)
Net earnings (loss), net of $1,925, $4,567 and $9,785 attributable to redeemable noncontrolling interest	87,323		58,048			29,275
Other comprehensive income (loss), net of tax	(7,226)				(7,163)	(63)
Purchase of treasury stock	(786)			(786)
Purchase of treasury stock, Shares	54,732			54,000
Conversion of Class B to Class A shares	0							432	(432)
Conversion of Class B to Class A shares, Shares								1,297,000	(1,297,000)
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016	136,444	133,186						3,258
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016, Shares								9,774,000
Proceeds received from partial termination of Convertible Senior Notes hedge	1,869	1,869
Issuance of Series A preferred stock for cash	44,456	(5,544)
Issuance of Series A preferred stock for cash, Shares							1,000,000
Issuance of Series A preferred stock in Exchange for Senior Notes	167,658	(2,342)					170,000
Issuance of Series A preferred stock in Exchange for Senior Notes, Shares							3,400,000
Purchase of Equity Call Hedge Related to Issuance of Preferred Stock	(17,556)	(17,556)
Preferred stock dividends	(11,807)		(11,807)				(11,807)
Exercise of stock options	2,621	1,899		681				41
Exercise of stock options, shares				(61,000)				123,000
Purchase of Puttable Equity Linked Senior Notes	7	7
Restricted stock vested	0	(74)						74
Restricted stock vested, Shares								222,000
Stock-based compensation	14,931	14,931
Excess income tax deficiency from stock-based compensation	(2,216)	(2,216)
Redeemble noncontrolling interest adjustment	(6,845)	(6,845)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	0	500				(500)
Contributions from noncontrolling interests	18,136					18,136
Distributions to noncontrolling interests	(20,777)					(20,777)
Change to equity method of accounting due to disposition of partial interests in rental properties	(23,493)					(23,493)
Other changes in noncontrolling interests	(832)					(832)
Balance at Jan. 31, 2011	1,874,260	689,004	673,875	(259)	(94,429)	330,912	220,000	48,084	7,073
Balance, Shares at Jan. 31, 2011				21,000			4,400,000	144,252,000	21,219,000
Balance at Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016, Shares								9,774,039
Balance at Jan. 31, 2011	1,874,260	689,004	673,875	(259)	(94,429)	330,912	220,000	48,084	7,073
Balance, Shares at Jan. 31, 2011				21,000			4,400,000	144,252,000	21,219,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss), net of $1,925, $4,567 and $9,785 attributable to redeemable noncontrolling interest	3,999		(86,486)			90,485
Other comprehensive income (loss), net of tax	(24,981)				(26,031)	1,050
Purchase of treasury stock	(1,670)			(1,670)
Purchase of treasury stock, Shares	90,104			90,000
Conversion of Class B to Class A shares	0							95	(95)
Conversion of Class B to Class A shares, Shares								284,000	(284,000)
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016	48,742	47,594						1,148
Issuance of Class A shares in exchange for Convertible Senior Notes due 2016, Shares								3,444,000
Preferred stock dividends	(15,400)		(15,400)				(15,400)
Exercise of stock options	195	136		55				4
Exercise of stock options, shares				3,000				13,000
Restricted stock vested	0	(114)						114
Restricted stock vested, Shares								343,000
Stock-based compensation	12,585	12,585
Excess income tax deficiency from stock-based compensation	(812)	(812)
Redeemble noncontrolling interest adjustment	(6,887)	(6,887)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(20,953)	(518)				(20,435)
Contributions from noncontrolling interests	6,087					6,087
Distributions to noncontrolling interests	(89,644)					(89,644)
Change to equity method of accounting for subsidiaries	(33,598)					(33,598)
Other changes in noncontrolling interests	(51)					(51)
Balance at Jan. 31, 2012	1,751,872	740,988	571,989	(1,874)	(120,460)	284,806	220,000	49,445	6,978
Balance, Shares at Jan. 31, 2012				108,000			4,400,000	148,336,000	20,935,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss), net of $1,925, $4,567 and $9,785 attributable to redeemable noncontrolling interest	46,056		36,425			9,631
Other comprehensive income (loss), net of tax	17,230				17,257	(27)
Purchase of treasury stock	(1,963)			(1,963)
Purchase of treasury stock, Shares	129,568			129,000
Conversion of Class B to Class A shares	0							233	(233)
Conversion of Class B to Class A shares, Shares								700,000	(700,000)
Issuance of Class A shares in exchange for Series A preferred stock	(22,370)	201,530	(19,069)				(209,448)	4,617
Issuance of Class A shares in exchange for Series A preferred stock, shares							(4,189,000)	(13,852,000)
Preferred stock dividends	(13,060)		(13,060)				(13,060)
Exercise of stock options	8,368	4,531		3,729				108
Exercise of stock options, shares	553,818			230,000				322,000
Restricted stock vested	0	(173)						173
Restricted stock vested, Shares								519,000
Stock-based compensation	14,751	14,751
Excess income tax deficiency from stock-based compensation	(961)	(961)
Redeemble noncontrolling interest adjustment	(8,424)	(8,424)
Acquisition of partners' noncontrolling interest in consolidated subsidiaries	(27,335)	(20,197)				(7,138)
Contributions from noncontrolling interests	1,886					1,886
Distributions to noncontrolling interests	(27,680)					(27,680)
Change to equity method of accounting for subsidiaries	(724)					(724)
Other changes in noncontrolling interests	925					925
Balance at Jan. 31, 2013	$ 1,738,571	$ 932,045	$ 576,285	$ (108)	$ (103,203)	$ 261,679	$ 10,552	$ 54,576	$ 6,745
Balance, Shares at Jan. 31, 2013				7,000			211,000	163,729,000	20,235,000