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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Feb. 28, 2014
Golsen Group [Member]
Mar. 31, 2013
Golsen Group [Member]
Related Party Transaction [Line Items]        
Dividends on preferred stock paid or declared $ 300 $ 300 $ 300 $ 300