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Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 Restricted Stock [Member] | Dec. 31, 2010 Restricted Stock [Member] March 2010 [Member] | Dec. 31, 2010 Restricted Stock [Member] April 2010 [Member] | Dec. 31, 2010 Restricted Stock [Member] July 2010 [Member] | Dec. 31, 2010 Restricted Stock [Member] December 2010 [Member] | Dec. 31, 2011 Restricted Stock [Member] April 2011 [Member] | Dec. 31, 2012 Restricted Stock [Member] April 2012 [Member] | Dec. 31, 2012 Restricted Stock [Member] August 2012 [Member] | Dec. 31, 2010 Restricted Stock [Member] November 2010 [Member] | Dec. 31, 2012 RSU [Member] | Dec. 31, 2010 RSU [Member] March 2010 [Member] | Dec. 31, 2010 RSU [Member] July 2010 [Member] | Dec. 31, 2010 RSU [Member] July 2010 [Member] | Dec. 31, 2011 RSU [Member] April 2011 [Member] | Dec. 31, 2011 RSU [Member] August 2011 [Member] | Dec. 31, 2012 RSU [Member] March 2012 [Member] | Dec. 31, 2010 RSU [Member] August 2010 [Member] | Dec. 31, 2011 RSU [Member] December 2011 [Member] | Dec. 31, 2012 RSU [Member] February 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture |  |  |  |  |  |  |  |  | (5,077) |  |  |  |  |  |  |  | (5,000) | (30,000) | (1,875)
Date |  | March 2010 | April 2010 | July 2010 | December 2010 | April 2011 | April 2012 | August 2012 | November 2010 |  |  | July 2010 | July 2010 | April 2011 | August 2011 | March 2012 | August 2010 | December 2011 | February 2012
Exchange |  | (102,084) |  | (16,875) |  |  |  |  |  |  | 102,084 | 16,875 | 16,875 |  |  |  |  |  |
Grant | (90,388) |  | 8,364 |  | 5,000 | 9,204 | 9,584 | 1,496 |  | 420,834 |  | 5,000 | 5,000 | 5,000 | 308,750 | 20,000 |  |  |
Estimated Fair Value on Grant Date, Exchange |  | $ 1,796 | $ 150 |  | $ 83 | $ 150 | $ 150 | $ 25 |  |  |  | $ 80 | $ 269 | $ 82 | $ 4,586 | $ 310 |  |  |
Initial Vesting |  | Jul. 01, 2010 | Jul. 01, 2010 |  | Dec. 01, 2010 | Jul. 01, 2011 | Jul. 01, 2012 | Jul. 01, 2013 |  |  |  | Oct. 01, 2010 | Oct. 01, 2010 | Jul. 01, 2011 | Jan. 01, 2012 | Mar. 01, 2013 |  |  |
Final Vesting |  | Sep. 29, 2012 | Apr. 01, 2013 |  | Jul. 01, 2013 | Apr. 01, 2014 | Apr. 01, 2015 | Jul. 01, 2015 |  |  |  | Jul. 01, 2013 | Sep. 29, 2012 | Apr. 01, 2014 | Jan. 01, 2014 | Mar. 01, 2015 |  |  |

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