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Subsequent Events - Additional Information (Detail) (USD $) | 3 Months Ended |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Shares Vesting [Member] | Apr. 01, 2013 Subsequent Event [Member] | Apr. 01, 2013 Subsequent Event [Member] Shares Vesting [Member] | Mar. 31, 2013 Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |
Dividend declared per share of common stock | $ 0.40 | $ 0.40 |  |  |  | $ 0.40
Declaration Date |  |  |  |  |  | May 01, 2013
Payment Date |  |  |  |  |  | Jul. 12, 2013
Record Date |  |  |  |  |  | Jun. 28, 2013
Granted, restricted shares of common stock |  |  | 20,000 |  | 2,826 |
Initial vesting date |  |  | Dec. 01, 2013 | Jul. 01, 2013 |  |
Final vesting date |  |  | Dec. 01, 2015 | Apr. 01, 2016 |  |

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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=6959260&loc=d3e187085-122770 + Details
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