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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 |

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