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Operating Segment Results - (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net sales $ 464,290 $ 489,270 $ 498,738
Cost of sales (exclusive of depreciation and amortization shown separately below) 394,812 419,175 421,105
Selling, General and Administrative Expense 49,481 47,436 49,635
Depreciation expense 31,579 31,953 31,404
Segment Reporting, Other Segment Item, Amount 15,966 12,510 17,686
Operating Income (Loss) (27,548) (21,804) (21,092)
Depreciation and amortization 45,302 46,120 47,231
Expenditures for long-lived assets 18,314 20,496 17,952
Assets 456,893 510,885  
Investment in joint venture 34,971 32,701  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (45,434) (53,671) (31,069)
Operating Segments | Mobile Solutions      
Segment Reporting Information [Line Items]      
Net sales 283,944 303,335 293,536
Cost of sales (exclusive of depreciation and amortization shown separately below) 251,847 271,110 253,906
Selling, General and Administrative Expense 14,672 14,471 13,559
Depreciation expense 26,027 25,803 24,839
Segment Reporting, Other Segment Item, Amount 9,476 3,700 3,397
Operating Income (Loss) (18,078) (11,749) (2,165)
Depreciation and amortization 29,381 29,156 28,192
Expenditures for long-lived assets 13,438 15,387 14,590
Assets 294,204 329,610  
Operating Segments | Power Solutions      
Segment Reporting Information [Line Items]      
Net sales 180,545 185,948 205,204
Cost of sales (exclusive of depreciation and amortization shown separately below) 143,197 148,096 167,206
Selling, General and Administrative Expense 12,987 13,104 15,147
Depreciation expense 3,994 4,504 5,009
Segment Reporting, Other Segment Item, Amount 7,256 9,148 14,306
Operating Income (Loss) 13,111 11,096 3,536
Depreciation and amortization 14,363 15,318 17,483
Expenditures for long-lived assets 3,252 3,643 2,401
Assets 124,460 147,155  
Corporate, Non-Segment      
Segment Reporting Information [Line Items]      
Depreciation and amortization 1,558 1,646 1,556
Expenditures for long-lived assets 1,624 1,466 961
Assets 38,229 34,120  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net sales (199) (13) (2)
Cost of sales (exclusive of depreciation and amortization shown separately below) (232) (31) (7)
Selling, General and Administrative Expense 21,822 19,861 20,929
Depreciation expense 1,558 1,646 1,556
Segment Reporting, Other Segment Item, Amount (766) (338) (17)
Operating Income (Loss) $ (22,581) $ (21,151) $ (22,463)