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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 387,342 | $ 406,413 | $ 778,055 | $ 808,631
Energy and related sales, net | 981 | 2,001 | 2,110 | 2,667
Total revenues | 388,323 | 408,414 | 780,165 | 811,298
Costs of products sold | 357,887 | 365,691 | 692,800 | 710,732
Gross profit | 30,436 | 42,723 | 87,365 | 100,566
Selling, general and administrative expenses | 31,999 | 37,191 | 67,085 | 69,049
(Gains) losses on dispositions of plant, equipment and timberlands, net | (58) | 2 | (26) | 26
Operating income (loss) | (1,505) | 5,530 | 20,306 | 31,491
Other non-operating income (expense) |  |  |  |
Interest expense | (4,476) | (3,953) | (8,484) | (8,069)
Interest income | 45 | 61 | 158 | 152
Other, net | (149) | 317 | (428) | (383)
Total non-operating expense | (4,580) | (3,575) | (8,754) | (8,300)
(Loss) income before income taxes | (6,085) | 1,955 | 11,552 | 23,191
Income tax provision (benefit) | (371) | (10) | 5,663 | 5,058
Net income (loss) | (5,714) | 1,965 | 5,889 | 18,133
Other comprehensive income | 26,332 | (11,539) | 33,525 | 4,203
Comprehensive income (loss) | 20,618 | (9,574) | 39,414 | 22,336
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 191,370 | 209,269 | 397,141 | 427,157
Energy and related sales, net | 981 | 2,001 | 2,110 | 2,667
Total revenues | 192,351 | 211,270 | 399,251 | 429,824
Costs of products sold | 195,444 | 204,495 | 379,390 | 396,454
Gross profit | (3,093) | 6,775 | 19,861 | 33,370
Selling, general and administrative expenses | 16,875 | 22,622 | 37,246 | 41,067
(Gains) losses on dispositions of plant, equipment and timberlands, net | 16 | 2 | 48 | 4
Operating income (loss) | (19,984) | (15,849) | (17,433) | (7,701)
Other non-operating income (expense) |  |  |  |
Interest expense | (5,182) | (4,289) | (9,843) | (8,704)
Interest income | 142 | 169 | 291 | 350
Equity in earnings of subsidiaries | 18,801 | 16,385 | 32,418 | 29,257
Other, net | 534 | (575) | 1,027 | (1,117)
Total non-operating expense | 14,295 | 11,690 | 23,893 | 19,786
(Loss) income before income taxes | (5,689) | (4,159) | 6,460 | 12,085
Income tax provision (benefit) | 25 | (6,124) | 571 | (6,048)
Net income (loss) | (5,714) | 1,965 | 5,889 | 18,133
Other comprehensive income | 26,332 | (11,539) | 33,525 | 4,203
Comprehensive income (loss) | 20,618 | (9,574) | 39,414 | 22,336
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 23,052 | 17,561 | 42,585 | 36,207
Total revenues | 23,052 | 17,561 | 42,585 | 36,207
Costs of products sold | 22,047 | 16,711 | 40,633 | 34,761
Gross profit | 1,005 | 850 | 1,952 | 1,446
Selling, general and administrative expenses | 236 | (36) | 310 | (221)
(Gains) losses on dispositions of plant, equipment and timberlands, net | (74) |  | (74) |
Operating income (loss) | 843 | 886 | 1,716 | 1,667
Other non-operating income (expense) |  |  |  |
Interest expense | (206) |  | (319) |
Interest income | 1,237 | 1,001 | 2,398 | 1,993
Equity in earnings of subsidiaries | 19,249 | 16,071 | 33,101 | 27,825
Other, net | (2,319) | (1,421) | (4,525) | (1,401)
Total non-operating expense | 17,961 | 15,651 | 30,655 | 28,417
(Loss) income before income taxes | 18,804 | 16,537 | 32,371 | 30,084
Income tax provision (benefit) | 3 | 152 | (47) | 827
Net income (loss) | 18,801 | 16,385 | 32,418 | 29,257
Other comprehensive income | 23,964 | (13,937) | 29,066 | (384)
Comprehensive income (loss) | 42,765 | 2,448 | 61,484 | 28,873
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 194,708 | 196,675 | 380,595 | 381,141
Total revenues | 194,708 | 196,675 | 380,595 | 381,141
Costs of products sold | 162,184 | 161,577 | 315,043 | 315,391
Gross profit | 32,524 | 35,098 | 65,552 | 65,750
Selling, general and administrative expenses | 14,888 | 14,605 | 29,529 | 28,203
(Gains) losses on dispositions of plant, equipment and timberlands, net |  |  |  | 22
Operating income (loss) | 17,636 | 20,493 | 36,023 | 37,525
Other non-operating income (expense) |  |  |  |
Interest expense | (437) | (814) | (941) | (1,601)
Interest income | 15 | 41 | 88 | 45
Other, net | 1,636 | 2,313 | 3,070 | 2,135
Total non-operating expense | 1,214 | 1,540 | 2,217 | 579
(Loss) income before income taxes | 18,850 | 22,033 | 38,240 | 38,104
Income tax provision (benefit) | (399) | 5,962 | 5,139 | 10,279
Net income (loss) | 19,249 | 16,071 | 33,101 | 27,825
Other comprehensive income | 23,371 | (13,490) | 28,385 | (373)
Comprehensive income (loss) | 42,620 | 2,581 | 61,486 | 27,452
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | (21,788) | (17,092) | (42,266) | (35,874)
Total revenues | (21,788) | (17,092) | (42,266) | (35,874)
Costs of products sold | (21,788) | (17,092) | (42,266) | (35,874)
Other non-operating income (expense) |  |  |  |
Interest expense | 1,349 | 1,150 | 2,619 | 2,236
Interest income | (1,349) | (1,150) | (2,619) | (2,236)
Equity in earnings of subsidiaries | (38,050) | (32,456) | (65,519) | (57,082)
Total non-operating expense | (38,050) | (32,456) | (65,519) | (57,082)
(Loss) income before income taxes | (38,050) | (32,456) | (65,519) | (57,082)
Net income (loss) | (38,050) | (32,456) | (65,519) | (57,082)
Other comprehensive income | (47,335) | 27,427 | (57,451) | 757
Comprehensive income (loss) | $ (85,385) | $ (5,029) | $ (122,970) | $ (56,325)

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