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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 229,480 | $ 209,855 | $ 215,742 | $ 211,209 | $ 209,327 | $ 210,120 | $ 195,974 | $ 184,941 | $ 866,286 | $ 800,362 | $ 761,216
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold |  |  |  |  |  |  |  |  | $ 735,879 | $ 656,773 | $ 629,467
Type of Cost, Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit | $ 30,674 | $ 29,872 | $ 33,300 | $ 36,561 | $ 38,337 | $ 37,375 | $ 35,096 | $ 32,781 | $ 130,407 | $ 143,589 | $ 131,749
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 111,721 | 110,534 | 153,153
Losses (gains) on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (3,256) | (197) | 116
Operating income (loss) |  |  |  |  |  |  |  |  | 21,942 | 33,252 | (21,520)
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (15,609) | (13,317) | (13,850)
Interest income |  |  |  |  |  |  |  |  | 559 | 237 | 206
Other, net |  |  |  |  |  |  |  |  | 383 | (705) | (7,418)
Total non-operating expense |  |  |  |  |  |  |  |  | (14,667) | (13,785) | (21,062)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 7,275 | 19,467 | (42,582)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 7,723 | 25,079 | (28,405)
Loss from continuing operations | $ (3,289) | $ (705) | $ 1,278 | $ 2,268 | $ (14,699) | $ 5,045 | $ 2,341 | $ 1,701 | (448) | (5,612) | (14,177)
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (207,242) | 19,868 | 53,388
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (30,086) | 6,342 | 17,657
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | (177,156) | 13,526 | 35,731
Net income (loss) |  |  |  |  |  |  |  |  | (177,604) | 7,914 | 21,554
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 25,533 | 63,931 | (14,120)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (152,071) | 71,845 | 7,434
Income tax provision |  |  |  |  |  |  |  |  | (30,086) | 6,342 | 17,657
Adjustments/ Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ (102,435) | $ (88,028) | $ (69,644)
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold |  |  |  |  |  |  |  |  | $ (102,435) | $ (88,028) | $ (69,644)
Type of Cost, Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 13,366 | $ 5,394 | $ 4,715
Interest income |  |  |  |  |  |  |  |  | (13,366) | (5,394) | (4,715)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (105,405) | (79,735) | (119,354)
Total non-operating expense |  |  |  |  |  |  |  |  | (105,405) | (79,735) | (119,354)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (105,405) | (79,735) | (119,354)
Loss from continuing operations |  |  |  |  |  |  |  |  | (105,405) | (79,735) |
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (105,405) | (79,735) |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 45,625 | (104,118) | 51,092
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (59,780) | $ (183,853) | $ 51,092
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold |  |  |  |  |  |  |  |  | $ 3,746 | $ 598 | $ 240
Type of Cost, Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit |  |  |  |  |  |  |  |  | $ (3,746) | $ (598) | $ (240)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 45,491 | 45,623 | 95,846
Losses (gains) on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (16) |  | 77
Operating income (loss) |  |  |  |  |  |  |  |  | (49,221) | (46,221) | (96,163)
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (23,527) | (15,939) | (15,464)
Interest income |  |  |  |  |  |  |  |  | 7,070 | 599 | 687
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 53,684 | 18,864 | 61,007
Other, net |  |  |  |  |  |  |  |  | (714) | 2,756 | (8,459)
Total non-operating expense |  |  |  |  |  |  |  |  | 36,513 | 6,280 | 37,771
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (12,708) | (39,941) | (58,392)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (12,260) | (34,329) | (44,215)
Loss from continuing operations |  |  |  |  |  |  |  |  | (448) | (5,612) | (14,177)
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (207,242) | 19,868 | 53,388
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (30,086) | 6,342 | 17,657
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | (177,156) | 13,526 | 35,731
Net income (loss) |  |  |  |  |  |  |  |  | (177,604) | 7,914 | 21,554
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 25,533 | 63,931 | (14,120)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (152,071) | 71,845 | 7,434
Income tax provision |  |  |  |  |  |  |  |  | (30,086) | 6,342 | 17,657
Guarantors [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 124,716 | $ 89,787 | $ 75,000
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold |  |  |  |  |  |  |  |  | $ 117,867 | $ 85,196 | $ 70,991
Type of Cost, Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit |  |  |  |  |  |  |  |  | $ 6,849 | $ 4,591 | $ 4,009
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,856 | 2,598 | 156
Losses (gains) on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (3,225) | (188) |
Operating income (loss) |  |  |  |  |  |  |  |  | 8,218 | 2,181 | 4,165
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (2,784) | (971) | (41)
Interest income |  |  |  |  |  |  |  |  | 6,238 | 4,947 | 4,177
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 51,721 | 60,871 | 58,347
Other, net |  |  |  |  |  |  |  |  | (6,862) | (6,776) | (3,966)
Total non-operating expense |  |  |  |  |  |  |  |  | 48,313 | 58,071 | 58,517
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 56,531 | 60,252 | 62,682
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 3,079 | 41,388 | 1,675
Loss from continuing operations |  |  |  |  |  |  |  |  | 53,452 | 18,864 | 61,007
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 53,452 | 18,864 | 61,007
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (22,411) | 52,290 | (25,916)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 31,041 | 71,154 | 35,091
Non Guarantors [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 844,005 | $ 798,603 | $ 755,860
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Costs of products sold |  |  |  |  |  |  |  |  | $ 716,701 | $ 659,007 | $ 627,880
Type of Cost, Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
Gross profit |  |  |  |  |  |  |  |  | $ 127,304 | $ 139,596 | $ 127,980
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 64,374 | 62,313 | 57,463
Losses (gains) on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (15) | (9) | 39
Operating income (loss) |  |  |  |  |  |  |  |  | 62,945 | 77,292 | 70,478
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (2,664) | (1,801) | (3,060)
Interest income |  |  |  |  |  |  |  |  | 617 | 85 | 57
Other, net |  |  |  |  |  |  |  |  | 7,959 | 3,315 | 5,007
Total non-operating expense |  |  |  |  |  |  |  |  | 5,912 | 1,599 | 2,004
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 68,857 | 78,891 | 72,482
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 16,904 | 18,020 | 14,135
Loss from continuing operations |  |  |  |  |  |  |  |  | 51,953 | 60,871 | 58,347
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 51,953 | 60,871 | 58,347
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (23,214) | 51,828 | (25,176)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 28,739 | $ 112,699 | $ 33,171

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