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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2012 | Aug. 06, 2012 | Sep. 30, 2012 ATM [Member] | Mar. 01, 2012 ATM [Member] Maximum [Member] | Sep. 30, 2012 Common Stock [Member] ATM [Member] | Mar. 01, 2012 Common Stock [Member] ATM [Member] | Sep. 30, 2012 Convertible Common Stock [Member] | Sep. 30, 2012 Restricted Stock Units Awards [Member] | Sep. 30, 2011 Restricted Stock Units Awards [Member] | Sep. 30, 2012 Restricted Stock Units Awards [Member] | Sep. 30, 2011 Restricted Stock Units Awards [Member] | Sep. 30, 2012 Series F Cumulative Preferred Stock [Member] | Sep. 30, 2012 Series F Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Underwritten public offering shares |  | 9,400,000 |  |  |  |  |  |  |  |  |  |  |
Underwriting Expenses | $ 127 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds to the company | 116,715 |  |  |  |  |  |  |  |  |  |  |  |
Shares of Company Stock Issuable under an At-the-Market Offering |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |
Aggregate gross sale proceeds of common stock under the At-the Market offering |  |  |  |  |  | 125,000 |  |  |  |  |  |  |
Issuance of common stock under the At-the-Market offering |  |  | 1,532,598 |  |  |  |  |  |  |  |  |  |
Weighted average price of common stock issued under the At-the-Market offering |  |  | $ 12.03 |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock under the At-the-Market offering |  |  | 18,063 |  |  |  |  |  |  |  |  |  |
Sale agent commission |  |  |  |  | 369 |  |  |  |  |  |  |  |
Converted Shares of common stock |  |  |  |  |  |  | 308,503,000 |  |  |  |  |  |
Conversion of Units to Common Stock |  |  |  |  |  |  | 2,710 |  |  |  |  |  |
Restricted stock/unit awards to employees |  |  |  |  |  |  |  |  |  | 365,137 | 292,339 |  |
Fair value of restricted stock/unit awards |  |  |  |  |  |  |  |  |  | 4,327 | 3,248 |  |
Vesting period of restricted stock/unit awards to employees |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Recognized compensation expense related to restricted stock/unit awards |  |  |  |  |  |  |  | 1,309 | 1,042 | 3,707 | 2,768 |  |
Unrecognized compensation expense related to restricted stock/unit awards |  |  |  |  |  |  |  | 5,536 |  | 5,536 |  |  |
Weighted average period during which unrecognized compensation expense is expected to be recognized |  |  |  |  |  |  |  |  |  | 10 months 28 days |  |  |
Amount of Share Based Compensation expense Capitalized |  |  |  |  |  |  |  | $ 19 | $ 0 | $ 19 | $ 0 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 5.065% | 5.065%

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