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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Dividends on preferred stocks $ 300 $ 300 $ 300
Golsen Group [Member]      
Related Party Transaction [Line Items]      
Dividends on preferred stocks $ 300 $ 300 $ 300