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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

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- Definition Area of a real estate property. + References No definition available. + Details
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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://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 + Details
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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 + Details
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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 + Details
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