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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]                      
Net sales $ 412,852 $ 419,960 $ 410,803 $ 417,469 $ 436,261 $ 465,092 $ 445,341 $ 455,721 $ 1,661,084 $ 1,802,415 $ 1,722,615
Energy and related sales, net                 5,664 7,927 3,153
Total revenues                 1,666,748 1,810,342 1,725,768
Costs of products sold                 1,463,783 1,575,188 1,507,108
Gross profit $ 58,116 $ 59,908 $ 32,833 $ 52,108 $ 58,164 $ 80,513 $ 41,437 $ 55,040 202,965 235,154 218,660
Selling, general and administrative expenses                 127,706 133,235 133,867
Gains on dispositions of plant, equipment and timberlands, net                 (21,113) (4,861) (1,726)
Operating income                 96,372 106,780 86,519
Other non-operating income (expense)                      
Interest expense                 (17,464) (18,921) (17,965)
Interest income                 283 159 310
Other, net                 (615) (635) 337
Total other expense                 (17,796) (19,397) (17,318)
Income (loss) before income taxes                 78,576 87,383 69,201
Income tax provision (benefit)                 14,001 18,137 2,043
Net income                 64,575 69,246 67,158
Other comprehensive income                 (35,616) (79,513) 88,609
Comprehensive income (loss)                 28,959 (10,267) 155,767
Adjustments/ Eliminations [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Net sales                 (78,026) (75,917) (76,860)
Total revenues                 (78,026) (75,917) (76,860)
Costs of products sold                 (78,026) (75,917) (76,868)
Gross profit                     8
Operating income                     8
Other non-operating income (expense)                      
Interest expense                 37,542 102,755 8,990
Interest income                 (37,543) (102,756) (8,991)
Equity in earnings of subsidiaries                 (86,683) (33,325) (106,828)
Total other expense                 (86,684) (33,326) (106,829)
Income (loss) before income taxes                 (86,684) (33,326) (106,821)
Net income                 (86,684) (33,326) (106,821)
Other comprehensive income                 11,330 11,864 (11,106)
Comprehensive income (loss)                 (75,354) (21,462) (117,927)
Parent Company [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Net sales                 875,026 902,892 887,859
Energy and related sales, net                 5,664 7,927 3,153
Total revenues                 880,690 910,819 891,012
Costs of products sold                 811,329 830,710 812,173
Gross profit                 69,361 80,109 78,839
Selling, general and administrative expenses                 71,751 67,086 69,614
Gains on dispositions of plant, equipment and timberlands, net                 (19,720) (3,545) (1,390)
Operating income                 17,330 16,568 10,615
Other non-operating income (expense)                      
Interest expense                 (18,147) (19,105) (18,891)
Interest income                 673 638 627
Equity in earnings of subsidiaries                 61,946 67,590 58,354
Other, net                 (3,389) (1,366) (1,569)
Total other expense                 41,083 47,757 38,521
Income (loss) before income taxes                 58,413 64,325 49,136
Income tax provision (benefit)                 (6,162) (4,921) (18,022)
Net income                 64,575 69,246 67,158
Other comprehensive income                 (35,616) (79,513) 88,609
Comprehensive income (loss)                 28,959 (10,267) 155,767
Guarantors [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Net sales                 84,704 78,077 80,991
Total revenues                 84,704 78,077 80,991
Costs of products sold                 80,455 74,414 76,640
Gross profit                 4,249 3,663 4,351
Selling, general and administrative expenses                 821 1,765 1,952
Gains on dispositions of plant, equipment and timberlands, net                 (1,183) (1,316) (319)
Operating income                 4,611 3,214 2,718
Other non-operating income (expense)                      
Interest income                 37,127 102,241 8,662
Equity in earnings of subsidiaries                 24,737 (34,265) 48,474
Other, net                 (1,471) 317 104
Total other expense                 60,393 68,293 57,240
Income (loss) before income taxes                 65,004 71,507 59,958
Income tax provision (benefit)                 2,922 3,916 1,611
Net income                 62,082 67,591 58,347
Other comprehensive income                 (41,010) (40,704) 6,883
Comprehensive income (loss)                 21,072 26,887 65,230
Non Guarantors [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Net sales                 779,380 897,363 830,625
Total revenues                 779,380 897,363 830,625
Costs of products sold                 650,025 745,981 695,163
Gross profit                 129,355 151,382 135,462
Selling, general and administrative expenses                 55,134 64,384 62,301
Gains on dispositions of plant, equipment and timberlands, net                 (210)   (17)
Operating income                 74,431 86,998 73,178
Other non-operating income (expense)                      
Interest expense                 (36,859) (102,571) (8,064)
Interest income                 26 36 12
Other, net                 4,245 414 1,802
Total other expense                 (32,588) (102,121) (6,250)
Income (loss) before income taxes                 41,843 (15,123) 66,928
Income tax provision (benefit)                 17,241 19,142 18,454
Net income                 24,602 (34,265) 48,474
Other comprehensive income                 29,680 28,840 4,223
Comprehensive income (loss)                 $ 54,282 $ (5,425) $ 52,697