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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)