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Unconsolidated Entities - Summary of Unconsolidated Co-investment Ventures (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014 sqft	Dec. 31, 2013	Sep. 30, 2014 Unconsolidated Co-Investment Ventures [Member] Property sqft	Dec. 31, 2013 Unconsolidated Co-Investment Ventures [Member] sqft Property	Sep. 30, 2013 Unconsolidated Co-Investment Ventures [Member] Property sqft	Sep. 30, 2014 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Americas [Member] Property sqft	Dec. 31, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Americas [Member] sqft Property	Sep. 30, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Americas [Member] sqft Property	Sep. 30, 2014 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Europe [Member] Property sqft	Dec. 31, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Europe [Member] Property sqft	Sep. 30, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Europe [Member] sqft Property	Sep. 30, 2014 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Asia [Member] sqft Property	Dec. 31, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Asia [Member] sqft Property	Sep. 30, 2013 Investment Management [Member] Unconsolidated Co-Investment Ventures [Member] Asia [Member] sqft Property
Schedule Of Equity Method Investments Joint Ventures [Line Items]
Number of properties owned				1,494	1,323	1,308	814	709	737	629	571	534	51	43	37
Square feet		12,600,000		301,751,000	264,293,000	257,569,000	130,476,000	108,537,000	114,042,000	145,332,000	132,876,000	124,794,000	25,943,000	22,880,000	18,733,000
Total assets	$ 24,072,103		$ 24,572,307	$ 25,713,935	$ 23,865,250	$ 23,382,115	$ 9,395,900	$ 8,014,339	$ 8,433,418	$ 11,951,749	$ 11,818,786	$ 11,471,358	$ 4,366,286	$ 4,032,125	$ 3,477,339

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Area of a real estate property.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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

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