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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 209,855 | $ 210,120 | $ 636,806 | $ 591,035
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold | $ 179,983 | $ 172,745 | $ 537,073 | $ 485,783
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 29,872 | $ 37,375 | $ 99,733 | $ 105,252
Selling, general and administrative expenses | 25,799 | 27,083 | 81,915 | 81,530
(Gains) losses on dispositions of plant, equipment and timberlands, net | (249) | (93) | (1,939) | (168)
Operating income (loss) | 4,322 | 10,385 | 19,757 | 23,890
Other non-operating income (expense) |  |  |  |
Interest expense | (3,965) | (3,324) | (11,237) | (10,025)
Interest income | 147 | 51 | 227 | 209
Other, net | 2,253 | (387) | 1,131 | (558)
Total non-operating expense | (1,565) | (3,660) | (9,879) | (10,374)
Income (loss) before income taxes | 2,757 | 6,725 | 9,878 | 13,516
Income tax provision (benefit) | 3,462 | 1,680 | 7,037 | 4,429
Income (loss) from continuing operations | (705) | 5,045 | 2,841 | 9,087
Discontinued operations: |  |  |  |
Income (loss) before income taxes | (114,656) | 9,661 | (128,714) | 14,422
Income tax provision (benefit) | (19,530) | 2,601 | (28,361) | 5,515
Income (loss) from discontinued operations | (95,126) | 7,060 | (100,353) | 8,907
Net income (loss) | (95,831) | 12,105 | (97,512) | 17,994
Other comprehensive income (loss) | 19,971 | 17,330 | 8,338 | 50,855
Comprehensive income (loss) | (75,860) | 29,435 | (89,174) | 68,849
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ (29,340) | $ (21,799) | $ (79,435) | $ (64,064)
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold | $ (29,340) | $ (21,799) | $ (79,435) | $ (64,064)
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Other non-operating income (expense) |  |  |  |
Interest expense | $ 1,549 | $ 1,430 | $ 4,526 | $ 4,049
Interest income | (1,549) | (1,430) | (4,526) | (4,049)
Equity in earnings of subsidiaries | (24,000) | (35,976) | (95,166) | (101,495)
Total non-operating expense | (24,000) | (35,976) | (95,166) | (101,495)
Income (loss) before income taxes | (24,000) | (35,976) | (95,166) | (101,495)
Income (loss) from continuing operations | (24,000) | (35,976) | (95,166) | (101,495)
Discontinued operations: |  |  |  |
Net income (loss) | (24,000) | (35,976) | (95,166) | (101,495)
Other comprehensive income (loss) | 4,954 | (29,771) | 38,619 | (87,222)
Comprehensive income (loss) | $ (19,046) | $ (65,747) | $ (56,547) | $ (188,717)
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold | $ 945 | $ 1,596 | $ 4,254 | $ 1,223
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ (945) | $ (1,596) | $ (4,254) | $ (1,223)
Selling, general and administrative expenses | 10,557 | 12,414 | 35,457 | 37,022
(Gains) losses on dispositions of plant, equipment and timberlands, net |  | 1 | (17) |
Operating income (loss) | (11,502) | (14,011) | (39,694) | (38,245)
Other non-operating income (expense) |  |  |  |
Interest expense | (4,439) | (4,018) | (12,773) | (12,078)
Interest income | 134 | 160 | 413 | 451
Equity in earnings of subsidiaries | 13,217 | 17,880 | 49,421 | 50,298
Other, net | 341 | 589 | (1,634) | 1,873
Total non-operating expense | 9,253 | 14,611 | 35,427 | 40,544
Income (loss) before income taxes | (2,249) | 600 | (4,267) | 2,299
Income tax provision (benefit) | (1,544) | (4,445) | (7,108) | (6,788)
Income (loss) from continuing operations | (705) | 5,045 | 2,841 | 9,087
Discontinued operations: |  |  |  |
Income (loss) before income taxes | (114,656) | 9,661 | (128,714) | 14,422
Income tax provision (benefit) | (19,530) | 2,601 | (28,361) | 5,515
Income (loss) from discontinued operations | (95,126) | 7,060 | (100,353) | 8,907
Net income (loss) | (95,831) | 12,105 | (97,512) | 17,994
Other comprehensive income (loss) | 19,971 | 17,330 | 8,338 | 50,855
Comprehensive income (loss) | (75,860) | 29,435 | (89,174) | 68,849
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 35,285 | $ 20,588 | $ 87,617 | $ 63,173
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold | $ 32,727 | $ 19,525 | $ 82,089 | $ 60,158
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 2,558 | $ 1,063 | $ 5,528 | $ 3,015
Selling, general and administrative expenses | 43 | 536 | 1,716 | 846
(Gains) losses on dispositions of plant, equipment and timberlands, net | (249) | (114) | (1,929) | (188)
Operating income (loss) | 2,764 | 641 | 5,741 | 2,357
Other non-operating income (expense) |  |  |  |
Interest expense | (629) | (300) | (1,670) | (619)
Interest income | 1,528 | 1,316 | 4,219 | 3,714
Equity in earnings of subsidiaries | 10,783 | 18,096 | 45,745 | 51,197
Other, net | 1,077 | (1,920) | (1,657) | (6,445)
Total non-operating expense | 12,759 | 17,192 | 46,637 | 47,847
Income (loss) before income taxes | 15,523 | 17,833 | 52,378 | 50,204
Income tax provision (benefit) | 2,349 | (47) | 3,022 | (94)
Income (loss) from continuing operations | 13,174 | 17,880 | 49,356 | 50,298
Discontinued operations: |  |  |  |
Net income (loss) | 13,174 | 17,880 | 49,356 | 50,298
Other comprehensive income (loss) | (1,767) | 14,812 | (19,318) | 43,878
Comprehensive income (loss) | 11,407 | 32,692 | 30,038 | 94,176
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 203,910 | $ 211,331 | $ 628,624 | $ 591,926
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold | $ 175,651 | $ 173,423 | $ 530,165 | $ 488,466
Type of Cost, Good or Service [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit (loss) | $ 28,259 | $ 37,908 | $ 98,459 | $ 103,460
Selling, general and administrative expenses | 15,199 | 14,133 | 44,742 | 43,662
(Gains) losses on dispositions of plant, equipment and timberlands, net |  | 20 | 7 | 20
Operating income (loss) | 13,060 | 23,755 | 53,710 | 59,778
Other non-operating income (expense) |  |  |  |
Interest expense | (446) | (436) | (1,320) | (1,377)
Interest income | 34 | 5 | 121 | 93
Other, net | 835 | 944 | 4,422 | 4,014
Total non-operating expense | 423 | 513 | 3,223 | 2,730
Income (loss) before income taxes | 13,483 | 24,268 | 56,933 | 62,508
Income tax provision (benefit) | 2,657 | 6,172 | 11,123 | 11,311
Income (loss) from continuing operations | 10,826 | 18,096 | 45,810 | 51,197
Discontinued operations: |  |  |  |
Net income (loss) | 10,826 | 18,096 | 45,810 | 51,197
Other comprehensive income (loss) | (3,187) | 14,959 | (19,301) | 43,344
Comprehensive income (loss) | $ 7,639 | $ 33,055 | $ 26,509 | $ 94,541

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