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Major Customers (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue, Major Customer [Line Items]        
Revenue from major customer $ 6,895 $ 5,388 $ 12,478 $ 22,437
Percentage of Total Revenue (%) 22.00% 10.50% 22.60% 23.30%
Shandong Morui Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 3,740 5,388 6,854 12,530
Percentage of Total Revenue (%) 11.90% 10.50% 12.40% 13.00%
Shouguang City Rongyuan Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 3,155   5,624 9,907
Percentage of Total Revenue (%) 10.10%   10.20% 10.30%
Bromine
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 4,161 3,507 7,912 16,523
Bromine | Shandong Morui Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 1,904 3,507 3,634 9,238
Bromine | Shouguang City Rongyuan Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 2,257   4,278 7,285
Crude Salt
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 1,625 1,121 2,459 4,585
Crude Salt | Shandong Morui Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 727 1,121 1,113 1,963
Crude Salt | Shouguang City Rongyuan Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 898   1,346 2,622
Chemical Products
        
Revenue, Major Customer [Line Items]        
Revenue from major customer 1,109 760 2,107 1,329
Chemical Products | Shandong Morui Chemical Company Limited
        
Revenue, Major Customer [Line Items]        
Revenue from major customer $ 1,109 $ 760 $ 2,107 $ 1,329