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Discontinued Operations - Summary of Major Line Items Included in Results of Operations of Discontinued Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Net sales $ 168,287 $ 248,534 $ 261,837
Cost of products sold (exclusive of depreciation and amortization shown separately below) 130,555 192,994 205,361
Selling, general and administrative expense 11,818 16,992 17,468
Depreciation and amortization 7,722 11,852 11,496
(Gain) loss on disposal of assets   27  
Restructuring and integration expense 429 4,366 2,019
Income from operations 17,763 22,303 25,493
Interest income (expense) (181) (284) (317)
Interest and other income (expense) (84) 503 (654)
Income from discontinued operations before gain on disposal and provision for income taxes 17,498 22,522 24,522
Provision for income taxes on discontinued operations (7,461) (6,369) (6,633)
Income from discontinued operations before gain on disposal 10,037 16,153 17,889
Gain on disposal of discontinued operations 213,503    
Provision for income taxes on gain on disposal (85,852)    
Income from discontinued operations, net of tax $ 137,688 $ 16,153 $ 17,889