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Acquisitions - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Oct. 03, 2016 USD ($) Customer T | Jun. 15, 2015 USD ($) T | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) ft² T | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 BRL | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2017 BRL | Dec. 31, 2016 BRL | Oct. 03, 2016 BRL Customer T
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid from cash on hand |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,339,000 |  | $ 23,510,000 |  | $ 5,133,000 |  |  |  |
Goodwill |  |  |  | $ 25,118,000 |  |  |  | $ 25,308,000 |  |  |  |  | 25,118,000 |  | 25,308,000 |  | 11,265,000 |  |  |  |
Net sales |  |  |  | 473,823,000 | $ 487,814,000 | $ 495,101,000 | $ 468,269,000 | 420,636,000 |  | $ 445,030,000 | $ 454,603,000 | $ 445,897,000 | 1,925,007,000 | [1] | 1,766,166,000 | [1] | 1,776,167,000 | [1] |  |  |
Net income |  |  |  | 9,884,000 | $ 21,899,000 | $ 27,882,000 | 31,913,000 | 8,417,000 |  | $ 21,362,000 | $ 28,496,000 | $ 27,916,000 | 91,578,000 |  | 86,191,000 |  | 75,968,000 |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | $ 78,613,000 |  | 103,076,000 |  | 119,349,000 |  |  |  |
Sun Products Corporation's (SUN's) Pasadena, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |
Acquisition of land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,377,000 |  |  |  |
Acquisition of manufacturing assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,623,000 |  |  |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |
Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 109,960,000 |  | 74,961,000 |  | 63,439,000 |  |  |  |
Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 19,160,000 |  |  |  | 19,491,000 |  |  |  |  | $ 19,160,000 |  | 19,491,000 |  | 5,402,000 |  |  |  |
Tebras And PBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 14,207,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  | 7,354,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  | 5,716,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of liabilities |  | 3,487,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] | Before purchase accounting adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 14,327,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tebras And PBC [Member] | After purchase accounting adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 14,207,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tebras And PBC [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |  |  |
Tebras And PBC [Member] | Brazil [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |
Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of production facility expected to be acquired | T |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000
Original purchase price of 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 |  |  |  |  |  |  | 2,804,000 |  |  |  |  | BRL 9,000,000 |
Unpaid working capital adjustments |  |  |  |  |  |  |  | $ 4,459,000 |  |  |  |  |  |  | $ 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 |  |
Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | Customer |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200
Procter and Gamble Company [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of production facility | T |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid from cash on hand |  |  | $ 5,133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  | 6,007,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of liabilities |  |  | $ 874,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 currently expected to be acquired | ft² |  |  |  |  |  | 124,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.

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