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Revolving Credit Facilities and Term Loans - Information Regarding Company's Revolving Credit Facilities, Term Loans (Detail) (USD $) |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities, LLC [Member] | Mar. 31, 2013 Unsecured revolving credit facility with PNC Bank National Association [Member] | Mar. 31, 2013 Unsecured Term Loan - Tranche 1 [Member] | Mar. 31, 2013 Unsecured Term Loan- Tranche 2 [Member] | Mar. 31, 2013 Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Carrying Value |  |  | $ 190,500,000 | $ 0 |  |  |
Unsecured term loan | 350,000,000 | 350,000,000 |  |  | 50,000,000 | 300,000,000 |
Secured Term Loan | $ 400,000,000 | $ 400,000,000 |  |  |  |  | $ 400,000,000
Weighted average interest rate |  |  | 1.70% |  |  |  |
Term Loan |  |  |  |  | 2.30% | 3.40% | 2.00%
Maturity Date |  |  | Apr. 30, 2017 | Apr. 30, 2017 |  |  |
Term loan maturity date |  |  |  |  | Jan. 31, 2017 | Jan. 31, 2019 | Apr. 30, 2017

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 Reference 2: 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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