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Related Party Transactions - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business |  | $ 2,300,000 |  |  |  |  | $ 349,373,000
Dividends on preferred stocks |  |  | $ 75,000 |  | $ 75,000 | $ 225,000 | 225,000
Jack E. Golsen [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Retirement date |  |  |  |  |  | Dec. 31, 2017 |
Jack E. Golsen [Member] | Operating Other Expense [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Extinguishment of estimated death benefit liability |  |  |  | $ 1,400,000 |  |  |
Jack E. Golsen [Member] | Scenario, Forecast [Member] | Transition Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Agreement commencement date | Jan. 01, 2018 |  |  |  |  |  |
Payment of annual cash retainer fee | $ 480,000 |  |  |  |  |  |
Amount payable to cover certain monthly expense | 4,400 |  |  |  |  |  |
Severance agreement, one-time payment | $ 2,320,000 |  |  |  |  |  |
Golsen Holders [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Dividends on preferred stocks |  |  |  |  |  | $ 0 | $ 0
Golsen Holders [Member] | Cumulative Preferred Stock [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Preferred stock, accumulated dividends |  | $ 603,000 | $ 603,000 |  |  | $ 603,000 |

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