Real Estate - Investments in Real Estate Properties (Detail) ft² in Thousands, $ in Thousands	Jun. 30, 2017 USD ($) ft² a Buildings	Dec. 31, 2016 USD ($) ft² a Buildings
Real Estate Properties [Line Items]
Total investments in real estate properties	$ 27,501,284	$ 27,119,330
Less accumulated depreciation	4,026,369	3,758,372
Net investments in real estate properties	$ 23,474,915	$ 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	$ 6,139,322	$ 6,037,543
Building and Improvements [Member]
Real Estate Properties [Line Items]
Square Feet \| ft²	332,282	331,210
Number of buildings \| Buildings	1,752	1,776
Total investments in real estate properties	$ 18,273,094	$ 17,905,914
Development Portfolio, Including Cost of Land: Pre-stabilized [Member]
Real Estate Properties [Line Items]
Square Feet \| ft²	5,878	8,256
Number of buildings \| Buildings	22	29
Total investments in real estate properties	$ 526,442	$ 798,233
Properties Under Development [Member]
Real Estate Properties [Line Items]
Square Feet \| ft²	22,325	19,539
Number of buildings \| Buildings	55	60
Total investments in real estate properties	$ 962,851	$ 633,849
Land [Member]
Real Estate Properties [Line Items]
Square Feet \| a	5,460	5,892
Total investments in real estate properties	$ 1,081,897	$ 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	$ 517,678	$ 524,887

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.

+ Details

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- 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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- 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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- 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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- 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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