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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 103 Months Ended
Jul. 12, 2010
May 31, 2011
Jun. 30, 2012
Mar. 31, 2009
May 03, 2010
Jun. 30, 2012
Dec. 31, 2011
May 31, 2010
Dec. 31, 2012
Jun. 25, 2007
Notes Receivable, Related Parties, Noncurrent             $ 4,090   $ 3,581 $ 3,000
Related Party Transaction, Rate       8.00%   6.00%        
Interest Income Related Party             1,090      
Stock Split Conversion Ratio               three-for-two    
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               $ 13,315  
Stock Split A (Member)
                    
Stock Split Conversion Ratio         three-for-two          
Stock Split B [Member]
                    
Stock Split Conversion Ratio   three-for-two