Real Estate - Investments in Real Estate Properties (Detail) ft² in Thousands, $ in Thousands	Mar. 31, 2019 USD ($) ft² a Building	Dec. 31, 2018 USD ($) ft² a Building
Real Estate Properties [Line Items]
Total investments in real estate properties	$ 34,395,698	$ 34,586,987
Less accumulated depreciation	4,868,611	4,656,680
Net investments in real estate properties	$ 29,527,087	$ 29,930,307
Improved Land [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	0	0
Number of buildings \| Building	0	0
Total investments in real estate properties	$ 8,106,848	$ 8,044,888
Building and Improvements [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	351,159	354,762
Number of buildings \| Building	1,869	1,858
Total investments in real estate properties	$ 22,560,379	$ 22,587,267
Development Portfolio, Including Cost of Land: Pre-stabilized [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	7,562	8,709
Number of buildings \| Building	34	30
Total investments in real estate properties	$ 623,569	$ 828,064
Properties Under Development [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	25,899	27,715
Number of buildings \| Building	65	70
Total investments in real estate properties	$ 1,316,068	$ 1,314,737
Land [Member]
Real Estate Properties [Line Items]
Square feet of properties \| a	4,582	4,929
Total investments in real estate properties	$ 1,143,294	$ 1,192,220
Other Real Estate Investments [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	0	0
Number of buildings \| Building	0	0
Total investments in real estate properties	$ 645,540	$ 619,811

Area of a real estate property.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- 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://fasb.org/us-gaap/role/ref/legacyRef
-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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- 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://fasb.org/us-gaap/role/ref/legacyRef
-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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- 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.

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