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Business Segments - Schedule of Financial Information for Corporation's Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net Sales | $ 108,009 | $ 96,166 | $ 325,378 | $ 317,369
Costs of products sold (excluding depreciation and amortization) | 86,656 | 76,389 | 260,741 | 256,563
Selling and administrative | 12,738 | 13,332 | 39,365 | 39,855
Depreciation and amortization | 7,091 | 4,586 | 17,095 | 13,954
Severance charge | 165 |  | 6,019 |
Income from operations | 1,123 | 1,870 | 1,895 | 6,995
Reconciliation to (loss) income before income taxes |  |  |  |
Interest expense | (3,001) | (2,976) | (8,552) | (8,750)
(Loss) income before income taxes | (1,130) | (818) | (5,308) | 845
Operating Segments |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net Sales | 108,009 | 96,166 | 325,378 | 317,369
Income from operations | 3,759 | 5,590 | 11,117 | 17,683
Operating Segments | FCEP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net Sales | 71,467 | 67,203 | 221,663 | 220,105
Costs of products sold (excluding depreciation and amortization) | 58,295 | 53,902 | 180,345 | 178,884
Selling and administrative | 6,365 | 6,516 | 19,236 | 18,602
Depreciation and amortization | 6,807 | 4,340 | 16,259 | 13,224
Severance charge | 165 |  | 6,019 |
Loss on disposal of assets | 236 | (11) | 263 | 2
Income from operations | (401) | 2,456 | (459) | 9,393
Operating Segments | ALP |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net Sales | 36,542 | 28,963 | 103,715 | 97,264
Costs of products sold (excluding depreciation and amortization) | 28,361 | 22,487 | 80,396 | 77,679
Selling and administrative | 3,737 | 3,096 | 10,907 | 10,565
Depreciation and amortization | 284 | 246 | 836 | 730
Income from operations | 4,160 | 3,134 | 11,576 | 8,290
Reconciling Item, Excluding Corporate Nonsegment |  |  |  |
Reconciliation to (loss) income before income taxes |  |  |  |
Interest expense | (3,001) | (2,976) | (8,552) | (8,750)
Other income - net | 748 | 288 | 1,349 | 2,600
Corporate Nonsegment |  |  |  |
Reconciliation to (loss) income before income taxes |  |  |  |
Corporate costs | $ (2,636) | $ (3,720) | $ (9,222) | $ (10,688)

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