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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Income and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Condensed Income Statements, Captions [Line Items]    
Net sales $ 455,721 $ 405,189
Energy and related sales, net 5,262 1,101
Total revenues 460,983 406,290
Costs of products sold 405,943 348,915
Gross profit 55,040 57,375
Selling, general and administrative expenses 33,551 33,487
(Gains) losses on dispositions of plant, equipment and timberlands, net (809) (73)
Operating income 22,298 23,961
Other non-operating income (expense)    
Interest expense (4,812) (3,841)
Interest income 61 102
Other, net 211 247
Total non-operating expense (4,540) (3,492)
Income before income taxes 17,758 20,469
Income tax provision (benefit) 3,110 4,840
Net income 14,648 15,629
Other comprehensive income (loss) 2,965 (7,689)
Comprehensive income (loss) 17,613 7,940
Adjustments/ Eliminations [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales (18) (5)
Energy and related sales, net      
Total revenues (18) (5)
Costs of products sold (18) (5)
Gross profit      
Selling, general and administrative expenses      
(Gains) losses on dispositions of plant, equipment and timberlands, net      
Operating income      
Other non-operating income (expense)    
Interest expense 2,658 1,689
Interest income (2,658) (1,689)
Other, net (22,499) (12,445)
Total non-operating expense (22,499) (12,445)
Income before income taxes (22,499) (12,445)
Income tax provision (benefit)      
Net income (22,499) (12,445)
Other comprehensive income (loss) (886) 12,586
Comprehensive income (loss) (23,385) 141
Parent Company [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 225,831 227,116
Energy and related sales, net 5,262 1,101
Total revenues 231,093 228,217
Costs of products sold 216,716 198,947
Gross profit 14,377 29,270
Selling, general and administrative expenses 17,793 21,128
(Gains) losses on dispositions of plant, equipment and timberlands, net (812) (73)
Operating income (2,604) 8,215
Other non-operating income (expense)    
Interest expense (4,739) (4,716)
Interest income 153 84
Other, net 21,618 11,956
Total non-operating expense 17,032 7,324
Income before income taxes 14,428 15,539
Income tax provision (benefit) (220) (90)
Net income 14,648 15,629
Other comprehensive income (loss) 2,965 (7,689)
Comprehensive income (loss) 17,613 7,940
Guarantors [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 18 6
Energy and related sales, net      
Total revenues 18 6
Costs of products sold 17 5
Gross profit 1 1
Selling, general and administrative expenses 13 14
(Gains) losses on dispositions of plant, equipment and timberlands, net      
Operating income (12) (13)
Other non-operating income (expense)    
Interest expense      
Interest income 2,559 1,689
Other, net 10 (4)
Total non-operating expense 2,569 1,685
Income before income taxes 2,557 1,672
Income tax provision (benefit) 913 675
Net income 1,644 997
Other comprehensive income (loss) 1 (4,608)
Comprehensive income (loss) 1,645 (3,611)
Non Guarantors [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 229,890 178,072
Energy and related sales, net      
Total revenues 229,890 178,072
Costs of products sold 189,228 149,968
Gross profit 40,662 28,104
Selling, general and administrative expenses 15,745 12,345
(Gains) losses on dispositions of plant, equipment and timberlands, net 3   
Operating income 24,914 15,759
Other non-operating income (expense)    
Interest expense (2,731) (814)
Interest income 7 18
Other, net 1,082 740
Total non-operating expense (1,642) (56)
Income before income taxes 23,272 15,703
Income tax provision (benefit) 2,417 4,255
Net income 20,855 11,448
Other comprehensive income (loss) 885 (7,978)
Comprehensive income (loss) $ 21,740 $ 3,470