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Summary of Restricted Stock and RSU Vesting Dates (Detail)
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 226,387
January 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2013
Number of shares vesting 96,256
March 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2013
Number of shares vesting 6,666
April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2013
Number of shares vesting 3,339
July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2013
Number of shares vesting 4,107
October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date October 2013
Number of shares vesting 1,605
January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2014
Number of shares vesting 94,899
March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2014
Number of shares vesting 6,667
April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2014
Number of shares vesting 1,985
July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2014
Number of shares vesting 2,100
January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2015
Number of shares vesting 796
March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2015
Number of shares vesting 6,667
April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2015
Number of shares vesting 800
July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2015
Number of shares vesting 500
Shares Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 16,802
Shares Vesting [Member] | January 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,507
Shares Vesting [Member] | March 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
Shares Vesting [Member] | April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,505
Shares Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,273
Shares Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,189
Shares Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,564
Shares Vesting [Member] | March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
Shares Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,568
Shares Vesting [Member] | July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,100
Shares Vesting [Member] | January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 796
Shares Vesting [Member] | March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
Shares Vesting [Member] | April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 800
Shares Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 500
RSU Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 209,585
RSU Vesting [Member] | January 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 93,749
RSU Vesting [Member] | March 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 6,666
RSU Vesting [Member] | April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 834
RSU Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 834
RSU Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 416
RSU Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 93,335
RSU Vesting [Member] | March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 6,667
RSU Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 417
RSU Vesting [Member] | July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
RSU Vesting [Member] | January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
RSU Vesting [Member] | March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 6,667
RSU Vesting [Member] | April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting   
RSU Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting