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Revolving Credit Facilities, Term Loans, Mortgages Payable and Scheduled Principal Repayments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Unsecured term loan	$ 350,000,000	$ 0
Term Loan, covenant compliance	The Company was in compliance with all of the financial and other covenants.	The Company was in compliance with all of the financial and other covenants.
Net book value of investments and real estate collateralizing mortgages payable	2,200,000,000
Fixed interest rates on mortgage payables, Minimum	3.40%
Fixed interest rates on mortgage payables, Maximum	9.80%
Gross fees paid for revolving credit facilities and term loans	3,000,000	4,000,000	2,900,000
Debt extinguishment costs	400,000	7,900,000	4,200,000
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility borrowing capacity	750,000,000
Accordion feature	1,250,000,000
Line of credit facility competitive bid option on periodic interest rates	Up to 50% of the facility
Facility fee	0.35%
Carrying Value	117,900,000	102,400,000
Unsecured revolving credit facility with PNC Bank National Association [Member]
Debt Instrument [Line Items]
Facility fee	0.35%
Carrying Value	30,000,000	40,000,000
Unsecured revolving credit facility	65,000,000
Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Specified spread line of credit facility LIBOR rate	1.65%
Specified spread line of credit facility prime rate	0.65%
Revolving Credit Facilities, covenant compliance	The Company was in compliance with these covenants at December 31, 2012.
Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items]
Accordion feature	600,000,000
Term Loan, covenant compliance	Company is in compliance with the covenants for the secured term loan
Secured Term Loan Borrowing Capacity	500,000,000	500,000,000
Term loan maturity date	Sep. 30, 2014
Term loan extension maturity period	1 year
Specified spread term loan facility LIBOR rate	1.70%
Unsecured Term Loan - Tranche 1 [Member]
Debt Instrument [Line Items]
Unsecured term loan	50,000,000	0
Specified spread term loan Libor rate	1.70%
Term Loan, covenant compliance	Company is in compliance with the covenants for Tranche 1 of the unsecured term loan.
Term loan maturity date	Jan. 31, 2017
Unsecured Term Loan- Tranche 2 [Member]
Debt Instrument [Line Items]
Unsecured term loan	300,000,000	0
Specified spread term loan Libor rate	2.10%
Term Loan, covenant compliance	Company is in compliance with the covenants for Tranche 2 of the unsecured term loan.
Term loan maturity date	Jan. 31, 2019
Euro-denominated borrowings [Member]
Debt Instrument [Line Items]
Carrying Value	6,200,000
Canadian Borrowings [Member]
Debt Instrument [Line Items]
Carrying Value	$ 51,700,000

X

- Definition

The increased amount of the facility the Company may expand to provided that new or existing lenders agree to the existing terms of the facility and increase their commitment level.

+ References

No definition available.

+ Details

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X

- Definition

Cost of early extinguishment of debt.

+ References

No definition available.

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- Definition

Extended Additional Maturity Period

+ References

No definition available.

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X

- Definition

The facility fee charged under the unsecured revolving credit facility.

+ References

No definition available.

+ Details

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X

- Definition

Fixed interest rates on mortgage payables Maximum.

+ References

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- Definition

Fixed interest rates on mortgage payables Minimum.

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- Definition

Gross fees paid for revolving credit facilities and term loans.

+ References

No definition available.

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- Definition

Line of credit facility competitive bid option on periodic interest rates.

+ References

No definition available.

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- Definition

Net Book Value of Investments and Real Estate collateralizing Mortgages Payable.

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No definition available.

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- Definition

Secured Term Loan Borrowing Capacity.

+ References

No definition available.

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X

- Definition

The spread for LIBOR borrowings based on the Company's current debt rating.

+ References

No definition available.

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X

- Definition

The spread for prime rate borrowings based on the Company's current debt rating.

+ References

No definition available.

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- Definition

The spread for LIBOR borrowings based on the Company's current debt rating.

+ References

No definition available.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ 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 Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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)(2))

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



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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



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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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



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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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