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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Private Offering [Member] | Jul. 31, 2011 Private Offering [Member] | Jul. 29, 2011 Private Offering [Member] | Jul. 25, 2011 Private Offering [Member] | Dec. 31, 2012 Follow-on public offering [Member] | Oct. 31, 2012 Follow-on public offering [Member] | Dec. 31, 2012 Series A Preferred Stock [Member] | Dec. 31, 2012 Series A Preferred Stock [Member] Public Offering [Member] | Aug. 01, 2012 Series A Preferred Stock [Member] Public Offering [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 450,000,000 | 450,000,000 |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 | $ 0.01 |  | $ 16.66 |  |  | $ 16.81 | $ 16.81 |  |  |
Preferred stock, shares authorized |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Common stock shares issued |  | 28,044,106 | 20,561,032 |  | 3,000,000 |  |  |  | 7,000,000 |  |  |
Common stock, shares outstanding |  | 28,044,106 | 20,561,032 |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  | 3,450,000 | 3,450,000 |  |  |  |  |  |  |  |  | 3,450,000
Preferred stock, shares outstanding |  | 3,450,000 | 3,450,000 |  |  |  |  |  |  |  |  |
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 the offering |  |  |  |  |  |  |  | $ 124,066 |  | $ 83,199 |  |
Shares issued to the underwriters option to purchase additional shares |  |  |  |  |  |  |  | 404,640 |  |  |  |
Selling commission per share |  |  |  | $ 0.33 |  |  |  |  |  |  |  |
Net proceeds per share before offering expenses |  |  |  | $ 16.33 |  |  |  |  |  |  |  |
Premium percentage over closing price |  |  |  | 4.65% |  |  |  |  |  |  |  |
Closing price per share |  |  |  |  |  |  | $ 15.92 |  |  |  |  |
Net proceeds before offering expenses |  |  |  |  |  | 48,980 |  |  |  |  |  |
Aggregate percent of holdings |  | 15.00% |  |  |  |  |  |  |  |  |  |
Share Repurchase | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |

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