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Acquisitions - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Mar. 26, 2018 USD ($) ft² T | Oct. 03, 2016 USD ($) Customer T | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 BRL (R$) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2017 BRL (R$) | Dec. 31, 2016 BRL (R$) | Oct. 03, 2016 BRL (R$) Customer T
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid from cash on hand |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,852,000 |  | $ 4,339,000 |  | $ 23,510,000 |  |  |  |  |
Goodwill |  |  |  | $ 22,954,000 |  |  |  | $ 25,118,000 |  |  |  | $ 25,308,000 |  | 22,954,000 |  | 25,118,000 |  | 25,308,000 |  |  |  |  |
Net sales |  |  |  | 466,659,000 | $ 507,997,000 | $ 519,866,000 | $ 499,335,000 | 473,823,000 | $ 487,814,000 | $ 495,101,000 | $ 468,269,000 |  |  | 1,993,857,000 | [1] | 1,925,007,000 | [1] | 1,766,166,000 | [1] |  |  |  |
Net income |  |  |  | 26,946,000 | $ 22,168,000 | $ 32,925,000 | $ 30,723,000 | 9,884,000 | $ 21,899,000 | $ 27,882,000 | 31,913,000 |  |  | $ 112,762,000 |  | 91,578,000 |  | 86,191,000 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,328,000 |  | 109,960,000 |  | 74,961,000 |  |  |  |  |
Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 17,054,000 |  |  |  | $ 19,160,000 |  |  |  | 19,491,000 |  | 17,054,000 |  | 19,160,000 |  | 19,491,000 |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,385,932,000 |  | $ 1,297,555,000 |  | 1,181,563,000 |  |  |  |  |
2018 Acquisition [Member] | BASF Mexicana, S.A. DE C.V. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  | $ 22,852,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Acquisition [Member] | BASF Mexicana, S.A. DE C.V. [Member] | Surfactants [Member] | Ecatepec, Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental inventory and related value-added taxes |  |  |  | 1,377,000 |  |  |  |  |  |  |  |  |  | 1,377,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  | 22,852,000 |  |  |  |  |  |  |  |  |  | 22,852,000 |  |  |  |  |  |  |  |  |
Payment of incremental inventory and related value-added taxes |  |  |  | 1,377,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets identified related to acquisition |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | Tebras And PBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | $ 32,442,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 14,207,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  |  | 7,354,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | Tebras And PBC [Member] | Before purchase accounting adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 14,327,000 |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | Tebras And PBC [Member] | After purchase accounting adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 14,207,000 |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisition [Member] | Tebras And PBC [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,000,000 |  |  |
2016 Acquisition [Member] | Tebras And PBC [Member] | Brazil [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
2016 Acquisition [Member] | 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
Paid from cash on hand |  |  |  |  |  |  |  |  |  |  |  | 21,812,000 | R$ 70,000,000 |  |  |  |  |  |  |  |  |  |
Original purchase price of acquisitions |  |  | $ 29,075,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 93,309,000
Deposited in escrow |  |  |  |  |  |  |  |  |  |  |  | 2,804,000 |  |  |  |  |  | 2,804,000 |  |  |  | R$ 9,000,000 |
Unpaid working capital adjustments |  |  |  |  |  |  |  |  |  |  |  | $ 4,459,000 |  |  |  |  |  | $ 4,459,000 |  |  |  | R$ 14,309,000 |
Working capital adjustment amount paid |  |  |  |  |  |  |  |  |  |  | 4,339,000 |  |  |  |  |  |  |  |  |  | R$ 13,925,000 |  |
Adjusted purchase price of the acquisitions |  |  |  |  |  |  |  |  |  |  | $ 28,955,000 |  |  |  |  |  |  |  |  |  | R$ 92,925,000 |  |
2016 Acquisition [Member] | Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | Customer |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.

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