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Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Dividends on preferred stocks	$ 75,000	$ 75,000		$ 150,000	$ 150,000
Other Operating income from extinguishment of estimated death benefit liability	(5,951,000)			(5,951,000)
Immediate Family Member of Management or Principal Owner \| Golsen Holders
Related Party Transaction [Line Items]
Dividends on preferred stocks				0	$ 0
Immediate Family Member of Management or Principal Owner \| Cumulative Preferred Stock [Member] \| Golsen Holders
Related Party Transaction [Line Items]
Preferred stock, accumulated dividends	828,000			828,000
Jack E. Golsen [Member] \| Death Benefit Agreement [Member] \| Operating Other Expense (Income) [Member]
Related Party Transaction [Line Items]
Other Operating income from extinguishment of estimated death benefit liability			$ 1,400,000
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Principal amount of notes sold	$ 500,000			$ 500,000