Acquisitions - Additional Information (Detail)			6 Months Ended
	Oct. 03, 2016 USD ($)	Oct. 03, 2016 BRL	Jun. 30, 2017 USD ($)	Jun. 13, 2017 ft² T	Mar. 31, 2017 USD ($)	Mar. 31, 2017 BRL	Oct. 03, 2016 BRL
Business Acquisition [Line Items]
Paid from cash on hand			$ 4,339,000
Tebras And PBC [Member]
Business Acquisition [Line Items]
Goodwill, change in purchase price	$ 14,327,000		$ 14,207,000
Acquisition of intangible assets	7,354,000
Tebras And PBC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquisition of intangible assets	4,331,000
Amortization periods for the identifiable intangible assets at the time of acquisition			13 years
Tebras And PBC [Member] | Supply Contract [Member]
Business Acquisition [Line Items]
Acquisition of intangible assets	2,555,000
Amortization periods for the identifiable intangible assets at the time of acquisition			4 years
Tebras And PBC [Member] | Non-compete Agreements [Member]
Business Acquisition [Line Items]
Acquisition of intangible assets	468,000
Amortization periods for the identifiable intangible assets at the time of acquisition			5 years
Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member]
Business Acquisition [Line Items]
Original purchase price of the acquisitions	29,075,000						BRL 93,309,000
Paid from cash on hand	21,812,000	BRL 70,000,000
Deposited in escrow	2,804,000						9,000,000
Unpaid working capital adjustments	$ 4,459,000						BRL 14,309,000
Working capital adjustment amount paid					$ 4,339,000	BRL 13,925,000
Adjusted purchase price of the acquisitions					$ 28,955,000	BRL 92,925,000
2017 Acquisition Agreement [Member] | 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 expected to be acquired | ft²				124,000