v3.8.0.1

Real Estate - Investments in Real Estate Properties (Detail) ft² in Thousands, $ in Thousands	Sep. 30, 2017 USD ($) ft² a Buildings	Dec. 31, 2016 USD ($) ft² a Buildings
Real Estate Properties [Line Items]
Total investments in real estate properties	$ 25,977,157	$ 27,119,330
Less accumulated depreciation	3,977,667	3,758,372
Net investments in real estate properties	$ 21,999,490	$ 23,360,958
Improved Land [Member]
Real Estate Properties [Line Items]
Square Feet | ft²	0	0
Number of buildings | Buildings	0	0
Total investments in real estate properties	$ 5,826,773	$ 6,037,543
Building and Improvements [Member]
Real Estate Properties [Line Items]
Square Feet | ft²	298,240	331,210
Number of buildings | Buildings	1,566	1,776
Total investments in real estate properties	$ 16,829,500	$ 17,905,914
Development Portfolio, Including Cost of Land: Pre-stabilized [Member]
Real Estate Properties [Line Items]
Square Feet | ft²	7,394	8,256
Number of buildings | Buildings	24	29
Total investments in real estate properties	$ 441,235	$ 798,233
Properties Under Development [Member]
Real Estate Properties [Line Items]
Square Feet | ft²	22,189	19,539
Number of buildings | Buildings	55	60
Total investments in real estate properties	$ 1,059,764	$ 633,849
Land [Member]
Real Estate Properties [Line Items]
Square Feet | a	5,871	5,892
Total investments in real estate properties	$ 1,313,268	$ 1,218,904
Other Real Estate Investments [Member]
Real Estate Properties [Line Items]
Square Feet | ft²	0	0
Number of buildings | Buildings	0	0
Total investments in real estate properties	$ 506,617	$ 524,887

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(3))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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