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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2013 Common Stock [Member] | Mar. 31, 2013 Common Stock [Member] Follow-on public offering [Member] | Nov. 30, 2012 Common Stock [Member] Follow-on public offering [Member] | Oct. 31, 2012 Common Stock [Member] Follow-on public offering [Member] | Nov. 30, 2012 Common Stock [Member] Underwriters Option [Member] | Jul. 31, 2013 Common Stock [Member] July 2013 Repurchase Program [Member] | Aug. 31, 2012 Series A Preferred Stock [Member] | Aug. 31, 2012 Series A Preferred Stock [Member] Public Offering [Member] | Dec. 31, 2013 Series A Preferred Stock [Member] Public Offering [Member] | Aug. 31, 2012 Series A Preferred Stock [Member] Public Offering Underwriters Option [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 450,000,000 | 450,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  | $ 16.90 |  | $ 16.81 | $ 16.81 |  |  |  |  |
Preferred stock, shares authorized | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |
Common stock shares issued | 36,888,467 | 28,044,106 |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 36,888,467 | 28,044,106 |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued | 3,450,000 | 3,450,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 3,450,000 | 3,450,000 |  |  |  |  |  |  |  |  |  |
Issuance of stock, Shares |  |  |  | 8,805,000 |  | 7,000,000 | 404,640 |  |  | 3,450,000 |  |
Net proceeds from common offerings |  |  |  | $ 148,333 | $ 124,066 |  |  |  |  |  |  |
Stock offering, authorized amount |  |  | 100,000 |  |  |  |  |  |  |  |  |
Share Repurchase |  |  |  |  |  |  |  | 50,000 |  |  |  |
Dividend rate of Series A Cumulative Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |  | 8.625% |
Liquidation preference |  |  |  |  |  |  |  |  |  | $ 25.00 |  |
Shares issued to the underwriters option to purchase additional shares |  |  |  |  |  |  |  |  |  |  |  | 450,000
Net proceeds from preferred offering |  |  |  |  |  |  |  |  | $ 83,199 |  |  |

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