Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Land	$ 703,478	$ 691,726
Buildings and Improvements	2,390,566	2,403,654
Less: Accumulated Depreciation	748,044	732,635
Construction in Progress	25,503	26,068
Net Investment in Real Estate	2,371,503	2,388,813
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $40,387 and $0	0	6,765
Tenant Improvements	Shorter of Lease Term or Useful Life
Balance, Beginning of Year	3,130,942	3,115,050	3,140,649
Acquisition of Real Estate Assets	69,481	65,770	22,953
Construction Costs and Improvements	100,207	74,116	72,822
Disposition of Real Estate Assets	(142,369)	(94,093)	(91,312)
Impairment of Real Estate	(2,652)	(1,246)	2,661
Write-off of Fully Depreciated Assets	(36,062)	(28,655)	(32,723)
Balance, End of Year	3,119,547	3,130,942	3,115,050
Balance, Beginning of Year	735,593	695,931	663,310
Depreciation for Year	94,271	100,074	95,931
Disposition of Assets	(45,758)	(31,757)	(30,587)
Balance, End of Year	$ 748,044	$ 735,593	$ 695,931
Buildings and Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	7 years
Buildings and Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	50 years
Land Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	3 years
Land Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property, plant and equipment, useful life	20 years