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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Condensed Income Statements, Captions [Line Items]        
Net sales $ 406,413 $ 410,803 $ 808,631 $ 828,272
Energy and related sales, net 2,001 715 2,667 2,783
Total revenues 408,414 411,518 811,298 831,055
Costs of products sold 365,691 378,685 710,732 746,114
Gross profit 42,723 32,833 100,566 84,941
Selling, general and administrative expenses 37,191 29,137 69,049 60,409
(Gains) losses on dispositions of plant, equipment and timberlands, net 2 (111) 26 (2,765)
Operating income (loss) 5,530 3,807 31,491 27,297
Other non-operating income (expense)        
Interest expense (3,953) (4,352) (8,069) (8,860)
Interest income 61 77 152 142
Other, net 317 215 (383) 28
Total non-operating expense (3,575) (4,060) (8,300) (8,690)
Total non-operating expense (3,575) (4,060) (8,300) (8,690)
Income (loss) before income taxes 1,955 (253) 23,191 18,607
Income tax (benefit) provision (10) (3,101) 5,058 1,834
Net income 1,965 2,848 18,133 16,773
Other comprehensive income (loss) (11,539) 17,087 4,203 (18,198)
Comprehensive income (loss) (9,574) 19,935 22,336 (1,425)
Adjustments/ Eliminations [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales (17,092) (19,563) (35,874) (40,218)
Total revenues (17,092) (19,563) (35,874) (40,218)
Costs of products sold (17,092) (19,563) (35,874) (40,218)
Other non-operating income (expense)        
Interest expense 1,150 6,626 2,236 13,329
Interest income (1,150) (6,625) (2,236) (13,327)
Equity in earnings of subsidiaries (32,456) (28,783) (57,082) (56,061)
Other, net       (2)
Total non-operating expense (32,456) (28,782) (57,082) (56,061)
Total non-operating expense (32,456) (28,782) (57,082) (56,061)
Income (loss) before income taxes (32,456) (28,782) (57,082) (56,061)
Net income (32,456) (28,782) (57,082) (56,061)
Other comprehensive income (loss) 27,427 (3,722) 757 (4,020)
Comprehensive income (loss) (5,029) (32,504) (56,325) (60,081)
Parent Company [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 209,269 212,920 427,157 432,796
Energy and related sales, net 2,001 715 2,667 2,783
Total revenues 211,270 213,635 429,824 435,579
Costs of products sold 204,495 212,472 396,454 416,154
Gross profit 6,775 1,163 33,370 19,425
Selling, general and administrative expenses 22,622 15,661 41,067 32,843
(Gains) losses on dispositions of plant, equipment and timberlands, net 2 (51) 4 (1,522)
Operating income (loss) (15,849) (14,447) (7,701) (11,896)
Other non-operating income (expense)        
Interest expense (4,289) (4,608) (8,704) (9,425)
Interest income 169 169 350 331
Equity in earnings of subsidiaries 16,385 17,478 29,257 34,562
Other, net (575) (746) (1,117) (1,460)
Total non-operating expense 11,690 12,293 19,786 24,008
Total non-operating expense 11,690 12,293 19,786 24,008
Income (loss) before income taxes (4,159) (2,154) 12,085 12,112
Income tax (benefit) provision (6,124) (5,002) (6,048) (4,661)
Net income 1,965 2,848 18,133 16,773
Other comprehensive income (loss) (11,539) 17,087 4,203 (18,198)
Comprehensive income (loss) (9,574) 19,935 22,336 (1,425)
Guarantors [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 17,561 22,667 36,207 42,817
Total revenues 17,561 22,667 36,207 42,817
Costs of products sold 16,711 21,921 34,761 41,255
Gross profit 850 746 1,446 1,562
Selling, general and administrative expenses (36) 458 (221) 955
(Gains) losses on dispositions of plant, equipment and timberlands, net       (1,183)
Operating income (loss) 886 288 1,667 1,790
Other non-operating income (expense)        
Interest income 1,001 6,498 1,993 13,097
Equity in earnings of subsidiaries 16,071 11,305 27,825 21,499
Other, net (1,421) (29) (1,401) (159)
Total non-operating expense 15,651 17,774 28,417 34,437
Total non-operating expense 15,651 17,774 28,417 34,437
Income (loss) before income taxes 16,537 18,062 30,084 36,227
Income tax (benefit) provision 152 584 827 1,665
Net income 16,385 17,478 29,257 34,562
Other comprehensive income (loss) (13,937) 13,680 (384) (24,870)
Comprehensive income (loss) 2,448 31,158 28,873 9,692
Non Guarantors [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales 196,675 194,779 381,141 392,877
Total revenues 196,675 194,779 381,141 392,877
Costs of products sold 161,577 163,855 315,391 328,923
Gross profit 35,098 30,924 65,750 63,954
Selling, general and administrative expenses 14,605 13,018 28,203 26,611
(Gains) losses on dispositions of plant, equipment and timberlands, net   (60) 22 (60)
Operating income (loss) 20,493 17,966 37,525 37,403
Other non-operating income (expense)        
Interest expense (814) (6,370) (1,601) (12,764)
Interest income 41 36 45 41
Other, net 2,313 990 2,135 1,649
Total non-operating expense 1,540 (5,344) 579 (11,074)
Total non-operating expense 1,540 (5,344) 579 (11,074)
Income (loss) before income taxes 22,033 12,622 38,104 26,329
Income tax (benefit) provision 5,962 1,317 10,279 4,830
Net income 16,071 11,305 27,825 21,499
Other comprehensive income (loss) (13,490) (9,958) (373) 28,890
Comprehensive income (loss) $ 2,581 $ 1,347 $ 27,452 $ 50,389