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Note Receivable - Related Party (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 2 Months Ended 11 Months Ended 13 Months Ended 21 Months Ended 34 Months Ended 39 Months Ended 54 Months Ended
Sep. 30, 2013
Jul. 12, 2010
May 31, 2011
Jun. 30, 2012
Mar. 31, 2009
May 03, 2010
Sep. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Jun. 25, 2007
Notes Receivable, Related Parties, Noncurrent                   $ 3,581 $ 3,581 $ 3,000
Related Party Transaction, Rate         8.00%     6.00%        
Interest Income Related Party                 1,090      
Related Party Shares Pledged As Collateral 472,500 765,000 210,000 315,000   510,000 315,000          
Shares Released Related Party Transaction   555,000                    
Market Value Shares Pledged As Collateral Related Party   $ 6,798               $ 17,289    
Stock Split A (Member)
                        
Stock Split Conversion Ratio           three-for-two            
Stock Split B [Member]
                        
Stock Split Conversion Ratio     three-for-two       three-for-two