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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Related Party Transaction [Line Items]        
Dividends on preferred stocks     $ 300,000 $ 300,000
Golsen Group [Member]        
Related Party Transaction [Line Items]        
Dividends on preferred stocks $ 300,000 $ 300,000