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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Income Statements, Captions [Line Items]    
Net sales $ 402,218 $ 417,469
Energy and related sales, net 666 2,068
Total revenues 402,884 419,537
Costs of products sold 345,041 367,429
Gross profit 57,843 52,108
Selling, general and administrative expenses 31,858 31,272
Losses (gains) on dispositions of plant, equipment and timberlands, net 24 (2,654)
Operating income 25,961 23,490
Other non-operating income (expense)    
Interest expense (4,116) (4,508)
Interest income 91 65
Other, net (700) (187)
Total non-operating expense (4,725) (4,630)
Income before income taxes 21,236 18,860
Income tax provision 5,068 4,935
Net income 16,168 13,925
Other comprehensive income 15,742 (35,285)
Comprehensive income 31,910 (21,360)
Adjustments/ Eliminations [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales (18,782) (20,655)
Total revenues (18,782) (20,655)
Costs of products sold (18,782) (20,655)
Other non-operating income (expense)    
Interest expense 1,086 6,703
Interest income (1,086) (6,702)
Equity in earnings of subsidiaries (24,626) (27,278)
Other, net   (1)
Total non-operating expense (24,626) (27,278)
Income before income taxes (24,626) (27,278)
Net income (24,626) (27,278)
Other comprehensive income (26,670) (298)
Comprehensive income (51,296) (27,576)
Parent Company [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 217,888 219,876
Energy and related sales, net 666 2,068
Total revenues 218,554 221,944
Costs of products sold 191,959 203,682
Gross profit 26,595 18,262
Selling, general and administrative expenses 18,445 17,182
Losses (gains) on dispositions of plant, equipment and timberlands, net 2 (1,471)
Operating income 8,148 2,551
Other non-operating income (expense)    
Interest expense (4,415) (4,817)
Interest income 181 163
Equity in earnings of subsidiaries 12,872 17,084
Other, net (542) (715)
Total non-operating expense 8,096 11,715
Income before income taxes 16,244 14,266
Income tax provision 76 341
Net income 16,168 13,925
Other comprehensive income 15,742 (35,285)
Comprehensive income 31,910 (21,360)
Guarantors [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 18,646 20,150
Total revenues 18,646 20,150
Costs of products sold 18,050 19,334
Gross profit 596 816
Selling, general and administrative expenses (185) 497
Losses (gains) on dispositions of plant, equipment and timberlands, net   (1,183)
Operating income 781 1,502
Other non-operating income (expense)    
Interest income 992 6,599
Equity in earnings of subsidiaries 11,754 10,194
Other, net 20 (130)
Total non-operating expense 12,766 16,663
Income before income taxes 13,547 18,165
Income tax provision 675 1,081
Net income 12,872 17,084
Other comprehensive income 13,553 (38,550)
Comprehensive income 26,425 (21,466)
Non Guarantors [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 184,466 198,098
Total revenues 184,466 198,098
Costs of products sold 153,814 165,068
Gross profit 30,652 33,030
Selling, general and administrative expenses 13,598 13,593
Losses (gains) on dispositions of plant, equipment and timberlands, net 22  
Operating income 17,032 19,437
Other non-operating income (expense)    
Interest expense (787) (6,394)
Interest income 4 5
Other, net (178) 659
Total non-operating expense (961) (5,730)
Income before income taxes 16,071 13,707
Income tax provision 4,317 3,513
Net income 11,754 10,194
Other comprehensive income 13,117 38,848
Comprehensive income $ 24,871 $ 49,042