Real Estate - Investments in Real Estate Properties (Detail) ft² in Thousands, $ in Thousands	Sep. 30, 2018 USD ($) ft² a Buildings	Dec. 31, 2017 USD ($) ft² a Buildings
Real Estate Properties [Line Items]
Total investments in real estate properties	$ 34,285,783	$ 25,838,644
Less accumulated depreciation	4,451,434	4,059,348
Net investments in real estate properties	$ 29,834,349	$ 21,779,296
Improved Land [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	0	0
Number of buildings \| Buildings	0	0
Total investments in real estate properties	$ 8,058,613	$ 5,735,978
Building and Improvements [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	354,717	294,811
Number of buildings \| Buildings	1,890	1,525
Total investments in real estate properties	$ 22,414,423	$ 16,849,349
Development Portfolio, Including Cost of Land: Pre-stabilized [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	6,016	7,345
Number of buildings \| Buildings	21	22
Total investments in real estate properties	$ 488,984	$ 546,173
Properties Under Development [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	25,617	22,216
Number of buildings \| Buildings	73	63
Total investments in real estate properties	$ 1,521,062	$ 1,047,316
Land [Member]
Real Estate Properties [Line Items]
Square feet of properties \| a	5,228	5,191
Total investments in real estate properties	$ 1,264,815	$ 1,154,383
Other Real Estate Investments [Member]
Real Estate Properties [Line Items]
Square feet of properties \| ft²	0	0
Number of buildings \| Buildings	0	0
Total investments in real estate properties	$ 537,886	$ 505,445

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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