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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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