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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Series F Preferred Stock | Mar. 06, 2014 Series F Preferred Stock | Jun. 30, 2014 Series F Preferred Stock Minimum | Jun. 30, 2014 Series G Preferred Stock | Mar. 31, 2014 Series G Preferred Stock | Jun. 30, 2014 Convertible Common Stock | Jun. 30, 2013 Convertible Common Stock
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depositary shares redeemed |  |  |  |  |  |  | 50,000 |  |  | 25,000 |  |
Depositary share percentage per share |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |
Dividend rate per share |  |  |  |  |  | 6.236% |  |  | 7.236% |  |  |
Preferred stock, par value per share |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |
Redemption price per share |  |  |  |  |  |  | $ 1,000.00 |  |  | $ 1,000.00 |  |
Dividend per share |  |  |  |  |  | $ 11.3299 |  |  | $ 36.18 |  |  |
Total dividend |  |  |  |  |  | $ 566 |  |  | $ 905 |  |  |
Cost associated with share redemption | 0 | 3,546 | 1,462 | 3,546 |  |  |  |  |  |  |  |
Preferred stock shares authorized | 10,000,000 |  | 10,000,000 |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 0 |  | 0 |  | 750 |  |  |  |  |  |  |
Fixed coupon rate of preferred stock |  |  |  |  |  |  |  | 2.375% |  |  |  |
Number of years of US treasury rate one |  |  |  |  |  | 30 years |  |  |  |  |  |
Number of years of US treasury rate two |  |  |  |  |  | 10 years |  |  |  |  |  |
LIBOR rate |  |  |  |  |  | 3-month LIBOR |  |  |  |  |  |
New coupon rate of preferred stock |  |  |  |  |  | 6.275% |  |  |  |  |  |
Units converted into common stock |  |  |  |  |  |  |  |  |  |  | 137,463 | 85,028
Noncontrolling interest reclassified to stockholders' equity |  |  | $ 0 | $ 0 |  |  |  |  |  |  | $ 1,333 | $ 804

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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 Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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