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Derivatives - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Series F Preferred Stock [Member] | Oct. 31, 2008 Series F Preferred Stock [Member]
Derivative [Line Items] |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  |  |  |  | 2.375% |
Number of years of U.S. treasury rate one |  |  |  |  |  | 30 years |
Number of years of U.S. treasury rate two |  |  |  |  |  | 10 years |
LIBOR rate |  |  |  |  |  | 3 month LIBOR |
New coupon rate of preferred stock |  |  |  |  |  | 5.935% |
Notional value of interest rate swap agreement |  |  |  |  |  |  | $ 50,000
Treasury rate of agreement |  |  |  |  |  |  | 5.2175%
Mark-to-Market (Loss) Gain on Interest Rate Protection Agreements | 0 | (29) | 52 | (334) |  |  |
Settlement payments of mark-to-market gains or losses | 214 | 326 | 774 | 865 |  |  |
Amortization to be reclassified from OCI into income |  |  | 1,846 |  |  |  |
Number of years of long dated treasuries |  |  | 30 years |  |  |  |
Outstanding settlement payment due on the agreement | $ 214 |  | $ 214 |  | $ 305 |  |

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- Definition Number of years of long dated treasuries. + References No definition available. + Details
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- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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- Definition One of three rates for which the highest of the three rates is the adjustable component of the dividend rate which is added to the fixed component to determine the overall dividend rate. + References No definition available. + Details
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- Definition Settlement payments of mark to market gains or losses. + References No definition available. + Details
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- Definition Percentage of treasury rate. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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