Debt - Debt Summary (Parenthetical) (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt	$ 10,608,294	$ 11,626,831
Cost of properties securing mortgage debt	$ 2,400,000
Count of properties securing mortgage debt \| Property	145
Cost of properties securing mortgage debt of consolidated entities	$ 3,000,000
Number of properties securing mortgage debt of consolidated entities \| Property	208
Senior Notes [Member]
Debt Instrument [Line Items]
Debt	$ 6,417,492	$ 6,516,392
Unsecured Other Debt [Member]
Debt Instrument [Line Items]
Cost of properties securing mortgage debt	$ 737,400
Minimum [Member] \| Secured Mortgage Debt of Consolidated Entities [Member]
Debt Instrument [Line Items]
Effective Interest Rate	2.40%
Debt Instrument maturity date	2017-07
Minimum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Effective Interest Rate	1.50%
Debt Instrument maturity date	2018-01
Minimum [Member] \| Unsecured Other Debt [Member]
Debt Instrument [Line Items]
Effective Interest Rate	4.50%
Debt Instrument maturity date	2019-11
Minimum [Member] \| Secured Mortgages [Member]
Debt Instrument [Line Items]
Effective Interest Rate	0.40%
Debt Instrument maturity date	2018-05
Maximum [Member] \| Secured Mortgage Debt of Consolidated Entities [Member]
Debt Instrument [Line Items]
Effective Interest Rate	5.30%
Debt Instrument maturity date	2027-12
Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Effective Interest Rate	7.60%
Debt Instrument maturity date	2026-06
Maximum [Member] \| Unsecured Other Debt [Member]
Debt Instrument [Line Items]
Effective Interest Rate	7.90%
Debt Instrument maturity date	2033-09
Maximum [Member] \| Secured Mortgages [Member]
Debt Instrument [Line Items]
Effective Interest Rate	7.80%
Debt Instrument maturity date	2025-12
EUR
Debt Instrument [Line Items]
Debt	$ 3,300,000
JPY
Debt Instrument [Line Items]
Debt	1,300,000
CAD
Debt Instrument [Line Items]
Debt	400,000
GBP
Debt Instrument [Line Items]
Debt	$ 200,000

Cost Of Properties Securing Consolidated Investees Mortgage Debt.

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Cost of properties securing mortgage debt.

+ References

No definition available.

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Count of properties securing consolidated investees mortgage debt.

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Count of properties securing mortgage debt.

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No definition available.

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- Definition

Debt instrument maturity month and year.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
-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 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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