Acquisition - Additional Information (Detail)		6 Months Ended
	Mar. 26, 2018 USD ($) ft² T	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Paid from cash on hand		$ 21,475,000	$ 4,339,000
BASF Mexicana, S.A. DE C.V. [Member] | Surfactants [Member] | Ecatepec, Mexico [Member]
Business Acquisition [Line Items]
Capacity of production facility expected to be acquired | T	50,000
Warehouse space, laboratory and office space currently expected to be acquired | ft²	124,000
Paid from cash on hand	$ 21,475,000