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Revolving Credit Facilities, Term Loans, Mortgages Payable and Scheduled Principal Repayments - Information Regarding Company's Revolving Credit Facilities, Term Loans And Mortgages Payable (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Unsecured term loan | $ 350,000,000 | $ 0
Secured debt | 400,000,000 | 500,000,000
Mortgage, Weighted Average Interest Rate | 5.80% | 5.90%
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities, LLC [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Value | 117,900,000 | 102,400,000
Weighted average interest rate | 2.20% | 2.70%
Maturity Date | Feb. 29, 2016 |
Unsecured revolving credit facility with PNC Bank National Association [Member] |  |
Debt Instrument [Line Items] |  |
Carrying Value | 30,000,000 | 40,000,000
Weighted average interest rate | 1.90% | 1.90%
Maturity Date | Feb. 29, 2016 |
Unsecured Term Loan - Tranche 1 [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured term loan | 50,000,000 | 0
Term Loan | 2.30% |
Term loan maturity date | Jan. 31, 2017 |
Unsecured Term Loan- Tranche 2 [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured term loan | 300,000,000 | 0
Term Loan | 3.40% |
Term loan maturity date | Jan. 31, 2019 |
Secured Term Loan with Key Bank National Association [Member] |  |
Debt Instrument [Line Items] |  |
Term Loan | 2.20% | 3.00%
Secured debt | 400,000,000 | 500,000,000
Term loan maturity date | Sep. 30, 2014 |
Mortgage indebtedness-Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt | 1,187,900,000 | 1,230,400,000
Mortgage, Weighted Average Interest Rate | 4.90% | 5.40%
Mortgage Maturity Date | March 2013 - February 2022 |
Mortgage indebtedness-Variable Rate [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt | 86,200,000 | 91,000,000
Mortgage, Weighted Average Interest Rate | 1.70% | 2.00%
Mortgage Maturity Date | April 2013 - December 2037 |
Tax-exempt certificates-Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 0 | $ 1,000,000
Mortgage, Weighted Average Interest Rate | 0.00% | 6.90%
Mortgage Maturity Date | NA |

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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 Reference 3: 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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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