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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Related Party Transaction [Line Items]    
Dividends on preferred stocks $ 75,000 $ 75,000
Golsen Holders [Member]    
Related Party Transaction [Line Items]    
Dividends on preferred stocks 0 $ 0
Cumulative Preferred Stock [Member] | Golsen Holders [Member]    
Related Party Transaction [Line Items]    
Preferred stock, accumulated dividends $ 453,000