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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |  |  |
Dividends per common share | $ 0.225 | $ 0.23 | $ 0.20 | $ 0.45 | $ 0.35 |
Preferred stock, outstanding |  | 0 |  | 0 |  | 0
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Record date of dividend payable | May 17, 2013 |  |  |  |  |
Date of dividend payable | Jun. 21, 2013 |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, outstanding |  | 191,750 |  | 191,750 |  |
Shares of Series A Preferred converted |  | 18,805 |  | 49,432 |  |
Series A Preferred Stock [Member] | June [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Record date of dividend payable |  |  |  | Jul. 01, 2013 |  |
Date of dividend payable |  |  |  | Jul. 29, 2013 |  |
Declared cash dividend on Series A Preferred shares |  |  |  | $ 0.05833 |  |
Series A Preferred Stock [Member] | July [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Record date of dividend payable |  |  |  | Aug. 01, 2013 |  |
Date of dividend payable |  |  |  | Aug. 27, 2013 |  |
Declared cash dividend on Series A Preferred shares |  |  |  | $ 0.05833 |  |
Series A Preferred Stock [Member] | August [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Record date of dividend payable |  |  |  | Sep. 03, 2013 |  |
Date of dividend payable |  |  |  | Sep. 27, 2013 |  |
Declared cash dividend on Series A Preferred shares |  |  |  | $ 0.05833 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 + Details
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