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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 |  |

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- 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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- 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. + Details
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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. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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