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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

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