Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Preferred Shares Outstanding (Parenthetical) (Detail) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2014	May 31, 2014
Class H cumulative redeemable preferred shares [Member]
Preferred Shares Outstanding [Line Items]
Preferred equity fixed dividend rate per annum	7.375%
Cumulative redeemable preferred shares liquidation value	$ 500		$ 500.00
Cumulative redeemable preferred shares authorized	750,000	750,000
Cumulative redeemable preferred shares issued	110,000
Cumulative redeemable preferred shares outstanding	110,000
Class J cumulative redeemable preferred shares [Member]
Preferred Shares Outstanding [Line Items]
Preferred equity fixed dividend rate per annum	6.50%	6.50%
Cumulative redeemable preferred shares liquidation value	$ 500	$ 500
Cumulative redeemable preferred shares authorized	750,000	750,000
Cumulative redeemable preferred shares issued	400,000	400,000
Cumulative redeemable preferred shares outstanding	400,000	400,000
Class K cumulative redeemable preferred shares [Member]
Preferred Shares Outstanding [Line Items]
Preferred equity fixed dividend rate per annum	6.25%	6.25%
Cumulative redeemable preferred shares liquidation value	$ 500	$ 500
Cumulative redeemable preferred shares authorized	750,000	750,000
Cumulative redeemable preferred shares issued	300,000	300,000
Cumulative redeemable preferred shares outstanding	300,000	300,000

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The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

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- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph d

-Article 4

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(d)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ 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 210.5-02.28)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

+ Details

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

+ References

+ Details

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