Debt - Debt Summary (Parenthetical) (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Schedule of Capitalization, Long-term Debt [Line Items]
Count of properties securing mortgage debt	196
Cost of properties securing mortgage debt	2,600,000,000
Count of properties securing mortgage debt	171
Cost of properties securing mortgage debt	2,000,000,000
Term Loans and Other Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Cost of properties securing mortgage debt	784,200,000
Euro [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Foreign principal borrowing included in total debt denominated in non-U.S. dollars	3,300,000,000
Japanese Yen [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Foreign principal borrowing included in total debt denominated in non-U.S. dollars	400,000,000
Minimum [Member] \| Senior Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	1.40%
Debt Instrument maturity date	2017-07
Minimum [Member] \| Secured Mortgage Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	3.30%
Debt Instrument maturity date	2015-07
Minimum [Member] \| Term Loans and Other Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	4.50%
Debt Instrument maturity date	2015-12
Minimum [Member] \| Secured Mortgage Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	1.90%
Debt Instrument maturity date	2015-07
Maximum [Member] \| Senior Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	7.60%
Debt Instrument maturity date	2026-06
Maximum [Member] \| Secured Mortgage Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	7.60%
Debt Instrument maturity date	2025-04
Maximum [Member] \| Term Loans and Other Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	7.90%
Debt Instrument maturity date	2033-09
Maximum [Member] \| Secured Mortgage Debt [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest Rate	6.90%
Debt Instrument maturity date	2027-12

Cost Of Properties Securing Consolidated Investees Mortgage Debt.

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- Definition

Cost of properties securing mortgage debt.

+ References

No definition available.

+ Details

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- Definition

Count of properties securing consolidated investees mortgage debt.

+ References

No definition available.

+ Details

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- Definition

Count of properties securing mortgage debt.

+ References

No definition available.

+ Details

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- Definition

Debt instrument maturity month and year.

+ References

No definition available.

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- Definition

Principal borrowings within the outstanding debt balance that are denominated in a foreign currency.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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