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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Income Statements, Captions [Line Items]    
Net sales $ 410,647 $ 390,713
Energy and related sales, net 1,428 1,129
Total revenues 412,075 391,842
Costs of products sold 363,169 336,213
Gross profit 48,906 55,629
Selling, general and administrative expenses 37,063 34,877
(Gains) losses on dispositions of plant, equipment and timberlands, net (1,554) 32
Operating income 13,397 20,720
Other non-operating income (expense)    
Interest expense (5,195) (4,008)
Interest income 54 113
Other, net 229 812
Total non-operating expense (4,912) (3,083)
Income before income taxes 8,485 17,637
Income tax provision (benefit) 2,769 6,034
Net income 5,716 11,603
Other comprehensive income 14,020 7,193
Comprehensive income 19,736 18,796
Adjustments/ Eliminations [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales (24,940) (20,478)
Total revenues (24,940) (20,478)
Costs of products sold (24,940) (20,478)
Other non-operating income (expense)    
Interest expense 1,370 1,270
Interest income (1,370) (1,270)
Equity in earnings of subsidiaries (43,488) (27,469)
Total non-operating expense (43,488) (27,469)
Income before income taxes (43,488) (27,469)
Net income (43,488) (27,469)
Other comprehensive income (23,071) (10,116)
Comprehensive income (66,559) (37,585)
Parent Company [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 199,439 205,771
Energy and related sales, net 1,428 1,129
Total revenues 200,867 206,900
Costs of products sold 191,165 185,246
Gross profit 9,702 21,654
Selling, general and administrative expenses 20,437 20,162
(Gains) losses on dispositions of plant, equipment and timberlands, net (438) 32
Operating income (10,297) 1,460
Other non-operating income (expense)    
Interest expense (5,682) (4,661)
Interest income 146 149
Equity in earnings of subsidiaries 21,233 13,617
Other, net (2,413) 1,584
Total non-operating expense 13,284 10,689
Income before income taxes 2,987 12,149
Income tax provision (benefit) (2,729) 546
Net income 5,716 11,603
Other comprehensive income 14,020 7,193
Comprehensive income 19,736 18,796
Guarantors [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 20,013 19,533
Total revenues 20,013 19,533
Costs of products sold 18,265 18,586
Gross profit 1,748 947
Selling, general and administrative expenses 2,005 74
(Gains) losses on dispositions of plant, equipment and timberlands, net (1,115)  
Operating income 858 873
Other non-operating income (expense)    
Interest expense (455) (113)
Interest income 1,244 1,161
Equity in earnings of subsidiaries 22,255 13,852
Other, net (3,263) (2,206)
Total non-operating expense 19,781 12,694
Income before income taxes 20,639 13,567
Income tax provision (benefit) (594) (50)
Net income 21,233 13,617
Other comprehensive income 11,036 5,102
Comprehensive income 32,269 18,719
Non Guarantors [Member]    
Condensed Income Statements, Captions [Line Items]    
Net sales 216,135 185,887
Total revenues 216,135 185,887
Costs of products sold 178,679 152,859
Gross profit 37,456 33,028
Selling, general and administrative expenses 14,621 14,641
(Gains) losses on dispositions of plant, equipment and timberlands, net (1)  
Operating income 22,836 18,387
Other non-operating income (expense)    
Interest expense (428) (504)
Interest income 34 73
Other, net 5,905 1,434
Total non-operating expense 5,511 1,003
Income before income taxes 28,347 19,390
Income tax provision (benefit) 6,092 5,538
Net income 22,255 13,852
Other comprehensive income 12,035 5,014
Comprehensive income $ 34,290 $ 18,866