Debt - Debt Summary (Parenthetical) (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Debt	$ 11,626,831	$ 9,336,977
Cost of properties securing mortgage debt	$ 2,900,000
Count of properties securing mortgage debt \| Property	175
Cost of properties securing mortgage debt	$ 3,200,000
Count of properties securing mortgage debt \| Property	220
Senior Notes [Member]
Debt Instrument [Line Items]
Debt	$ 6,516,392	6,046,965
Other Debt [Member]
Debt Instrument [Line Items]
Cost of properties securing mortgage debt	780,300
Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
Debt	$ 1,172,473	$ 1,042,628
Minimum [Member] \| Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
Interest Rate	1.90%
Debt Instrument maturity date	2016-10
Minimum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	1.50%
Debt Instrument maturity date	2018-01
Minimum [Member] \| Other Debt [Member]
Debt Instrument [Line Items]
Interest Rate	4.50%
Debt Instrument maturity date	2019-06
Minimum [Member] \| Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
Interest Rate	0.60%
Debt Instrument maturity date	2016-05
Maximum [Member] \| Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument maturity date	2027-12
Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	7.60%
Debt Instrument maturity date	2026-06
Maximum [Member] \| Other Debt [Member]
Debt Instrument [Line Items]
Interest Rate	7.90%
Debt Instrument maturity date	2033-09
Maximum [Member] \| Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
Interest Rate	7.70%
Debt Instrument maturity date	2025-12
EUR
Debt Instrument [Line Items]
Debt	$ 3,400,000
JPY
Debt Instrument [Line Items]
Debt	1,100,000
CAD
Debt Instrument [Line Items]
Debt	$ 400

Cost Of Properties Securing Consolidated Investees Mortgage Debt.

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- Definition

Cost of properties securing mortgage debt.

+ References

No definition available.

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Count of properties securing consolidated investees mortgage debt.

+ References

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Count of properties securing mortgage debt.

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- Definition

Debt instrument maturity month and year.

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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 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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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.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 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 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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