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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Condensed Income Statements, Captions [Line Items]        
Net sales $ 413,325 $ 405,301 $ 1,191,380 $ 1,213,932
Energy and related sales, net 1,236 1,346 3,346 4,013
Total revenues 414,561 406,647 1,194,726 1,217,945
Costs of products sold 359,826 345,477 1,052,626 1,056,209
Gross profit 54,735 61,170 142,100 161,736
Selling, general and administrative expenses 33,399 35,747 100,484 104,796
(Gains) losses on dispositions of plant, equipment and timberlands, net (24) 5 (50) 31
Operating income 21,360 25,418 41,666 56,909
Other non-operating income (expense)        
Interest expense (4,547) (3,895) (13,031) (11,964)
Interest income 51 52 209 204
Other, net (478) (573) (906) (956)
Total non-operating expense (4,974) (4,416) (13,728) (12,716)
Income before income taxes 16,386 21,002 27,938 44,193
Income tax provision (benefit) 4,281 1,401 9,944 6,459
Net income 12,105 19,601 17,994 37,734
Other comprehensive income (loss) 17,330 (69) 50,855 4,134
Comprehensive income 29,435 19,532 68,849 41,868
Parent Company [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 203,205 211,761 600,346 638,918
Energy and related sales, net 1,236 1,346 3,346 4,013
Total revenues 204,441 213,107 603,692 642,931
Costs of products sold 188,677 186,297 568,067 582,751
Gross profit 15,764 26,810 35,625 60,180
Selling, general and administrative expenses 18,730 21,048 55,976 62,115
(Gains) losses on dispositions of plant, equipment and timberlands, net 70 7 118 11
Operating income (3,036) 5,755 (20,469) (1,946)
Other non-operating income (expense)        
Interest expense (5,241) (4,332) (15,084) (13,036)
Interest income 160 173 451 523
Equity in earnings of subsidiaries 17,880 17,228 50,298 46,485
Other, net 498 (670) 1,525 (1,787)
Total non-operating expense 13,297 12,399 37,190 32,185
Income before income taxes 10,261 18,154 16,721 30,239
Income tax provision (benefit) (1,844) (1,447) (1,273) (7,495)
Net income 12,105 19,601 17,994 37,734
Other comprehensive income (loss) 17,330 (69) 50,855 4,134
Comprehensive income 29,435 19,532 68,849 41,868
Guarantors [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 20,588 18,086 63,173 54,293
Total revenues 20,588 18,086 63,173 54,293
Costs of products sold 19,525 16,732 60,158 51,493
Gross profit 1,063 1,354 3,015 2,800
Selling, general and administrative expenses 536 (25) 846 (246)
(Gains) losses on dispositions of plant, equipment and timberlands, net (114)   (188)  
Operating income 641 1,379 2,357 3,046
Other non-operating income (expense)        
Interest expense (300) (1) (619) (1)
Interest income 1,316 1,063 3,714 3,056
Equity in earnings of subsidiaries 18,096 16,225 51,197 44,050
Other, net (1,920) (819) (6,445) (2,220)
Total non-operating expense 17,192 16,468 47,847 44,885
Income before income taxes 17,833 17,847 50,204 47,931
Income tax provision (benefit) (47) 619 (94) 1,446
Net income 17,880 17,228 50,298 46,485
Other comprehensive income (loss) 14,812 (2,307) 43,878 (2,691)
Comprehensive income 32,692 14,921 94,176 43,794
Non Guarantors [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 211,331 192,214 591,926 573,355
Total revenues 211,331 192,214 591,926 573,355
Costs of products sold 173,423 159,208 488,466 474,599
Gross profit 37,908 33,006 103,460 98,756
Selling, general and administrative expenses 14,133 14,724 43,662 42,927
(Gains) losses on dispositions of plant, equipment and timberlands, net 20 (2) 20 20
Operating income 23,755 18,284 59,778 55,809
Other non-operating income (expense)        
Interest expense (436) (751) (1,377) (2,352)
Interest income 5 5 93 50
Other, net 944 916 4,014 3,051
Total non-operating expense 513 170 2,730 749
Income before income taxes 24,268 18,454 62,508 56,558
Income tax provision (benefit) 6,172 2,229 11,311 12,508
Net income 18,096 16,225 51,197 44,050
Other comprehensive income (loss) 14,959 (2,462) 43,344 (2,835)
Comprehensive income 33,055 13,763 94,541 41,215
Adjustments/ Eliminations [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales (21,799) (16,760) (64,065) (52,634)
Total revenues (21,799) (16,760) (64,065) (52,634)
Costs of products sold (21,799) (16,760) (64,065) (52,634)
Other non-operating income (expense)        
Interest expense 1,430 1,189 4,049 3,425
Interest income (1,430) (1,189) (4,049) (3,425)
Equity in earnings of subsidiaries (35,976) (33,453) (101,495) (90,535)
Total non-operating expense (35,976) (33,453) (101,495) (90,535)
Income before income taxes (35,976) (33,453) (101,495) (90,535)
Net income (35,976) (33,453) (101,495) (90,535)
Other comprehensive income (loss) (29,771) 4,769 (87,222) 5,526
Comprehensive income $ (65,747) $ (28,684) $ (188,717) $ (85,009)