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Note Receivable - Related Party (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
2 Months Ended 11 Months Ended 13 Months Ended 21 Months Ended 34 Months Ended 39 Months Ended 54 Months Ended 0 Months Ended
Jul. 12, 2010
May 31, 2011
Jun. 30, 2012
Mar. 31, 2009
May 03, 2010
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2013
Dec. 31, 2012
Jun. 25, 2007
May 03, 2010
Stock Split A (Member)
May 31, 2011
Stock Split B (Member)
Notes Receivable, Related Parties, Noncurrent     $ 3,541     $ 3,541   $ 3,600 $ 3,581 $ 3,000    
Related Party Transaction, Rate       8.00%   6.00%            
Interest Income Related Party             1,090          
Stockholders' Equity Note, Stock Split, Conversion Ratio                     1.5 1.5
Related Party Shares Pledged As Collateral 765,000 210,000 315,000   510,000              
Shares Released Related Party Transaction 555,000                      
Market Value Shares Pledged As Collateral Related Party $ 6,798             $ 15,240