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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 419,960 | $ 465,092 | $ 1,248,232 | $ 1,366,154
Energy and related sales, net | 1,153 | 860 | 3,936 | 6,912
Total revenues | 421,113 | 465,952 | 1,252,168 | 1,373,066
Costs of products sold | 361,205 | 385,439 | 1,107,319 | 1,196,076
Gross profit | 59,908 | 80,513 | 144,849 | 176,990
Selling, general and administrative expenses | 39,792 | 37,886 | 100,201 | 103,751
Gains on dispositions of plant, equipment and timberlands, net | (123) | (1,590) | (2,888) | (3,881)
Operating income (loss) | 20,239 | 44,217 | 47,536 | 77,120
Other non-operating income (expense) |  |  |  |
Interest expense | (4,317) | (4,671) | (13,177) | (14,245)
Interest income | 90 | 30 | 232 | 143
Other, net | (220) | (167) | (192) | 105
Total non-operating expense | (4,447) | (4,808) | (13,137) | (13,997)
Income (loss) before income taxes | 15,792 | 39,409 | 34,399 | 63,123
Income tax provision (benefit) | 2,288 | 9,037 | 4,122 | 13,434
Net income (loss) | 13,504 | 30,372 | 30,277 | 49,689
Other comprehensive income (loss) | (3,002) | (29,577) | (21,200) | (23,586)
Comprehensive income (loss) | 10,502 | 795 | 9,077 | 26,103
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | (19,437) | (17,524) | (59,655) | (55,211)
Total revenues | (19,437) | (17,524) | (59,655) | (55,211)
Costs of products sold | (19,437) | (17,524) | (59,655) | (55,211)
Other non-operating income (expense) |  |  |  |
Interest expense | 23,230 | 90,217 | 36,559 | 95,682
Interest income | (23,231) | (90,218) | (36,559) | (95,683)
Equity in earnings of subsidiaries | (4,808) | 59,566 | (60,654) | (18,555)
Other, net |  | 5 |  | 5
Total non-operating expense | (4,809) | 59,570 | (60,654) | (18,551)
Income (loss) before income taxes | (4,809) | 59,570 | (60,654) | (18,551)
Net income (loss) | (4,809) | 59,570 | (60,654) | (18,551)
Other comprehensive income (loss) | 13,706 | 8,919 | 9,451 | 7,485
Comprehensive income (loss) | 8,897 | 68,489 | (51,203) | (11,066)
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 222,803 | 236,182 | 655,599 | 679,877
Energy and related sales, net | 1,153 | 860 | 3,936 | 6,912
Total revenues | 223,956 | 237,042 | 659,535 | 686,789
Costs of products sold | 197,906 | 197,182 | 614,060 | 629,984
Gross profit | 26,050 | 39,860 | 45,475 | 56,805
Selling, general and administrative expenses | 24,764 | 19,352 | 57,607 | 53,699
Gains on dispositions of plant, equipment and timberlands, net | (4) | (1,590) | (1,526) | (2,565)
Operating income (loss) | 1,290 | 22,098 | (10,606) | 5,671
Other non-operating income (expense) |  |  |  |
Interest expense | (4,346) | (4,790) | (13,771) | (14,284)
Interest income | 181 | 152 | 513 | 468
Equity in earnings of subsidiaries | 14,173 | 14,935 | 48,775 | 56,784
Other, net | (961) | (383) | (2,423) | (1,603)
Total non-operating expense | 9,047 | 9,914 | 33,094 | 41,365
Income (loss) before income taxes | 10,337 | 32,012 | 22,488 | 47,036
Income tax provision (benefit) | (3,167) | 1,640 | (7,789) | (2,653)
Net income (loss) | 13,504 | 30,372 | 30,277 | 49,689
Other comprehensive income (loss) | (3,002) | (29,577) | (21,200) | (23,586)
Comprehensive income (loss) | 10,502 | 795 | 9,077 | 26,103
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 19,005 | 17,735 | 61,822 | 56,138
Total revenues | 19,005 | 17,735 | 61,822 | 56,138
Costs of products sold | 17,299 | 17,019 | 58,554 | 53,491
Gross profit | 1,706 | 716 | 3,268 | 2,647
Selling, general and administrative expenses | (8) | 589 | 947 | 1,431
Gains on dispositions of plant, equipment and timberlands, net |  |  | (1,183) | (1,316)
Operating income (loss) | 1,714 | 127 | 3,504 | 2,532
Other non-operating income (expense) |  |  |  |
Interest income | 23,129 | 89,951 | 36,226 | 95,165
Equity in earnings of subsidiaries | (9,366) | (74,502) | 11,879 | (38,229)
Other, net | 23 | 9 | (136) | 30
Total non-operating expense | 13,786 | 15,458 | 47,969 | 56,966
Income (loss) before income taxes | 15,500 | 15,585 | 51,473 | 59,498
Income tax provision (benefit) | 1,270 | 1,091 | 2,586 | 2,719
Net income (loss) | 14,230 | 14,494 | 48,887 | 56,779
Other comprehensive income (loss) | (5,954) | (25,843) | (30,607) | (26,392)
Comprehensive income (loss) | 8,276 | (11,349) | 18,280 | 30,387
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 197,589 | 228,699 | 590,466 | 685,350
Total revenues | 197,589 | 228,699 | 590,466 | 685,350
Costs of products sold | 165,437 | 188,762 | 494,360 | 567,812
Gross profit | 32,152 | 39,937 | 96,106 | 117,538
Selling, general and administrative expenses | 15,036 | 17,946 | 41,647 | 48,622
Gains on dispositions of plant, equipment and timberlands, net | (119) |  | (179) |
Operating income (loss) | 17,235 | 21,991 | 54,638 | 68,916
Other non-operating income (expense) |  |  |  |
Interest expense | (23,201) | (90,098) | (35,965) | (95,643)
Interest income | 11 | 145 | 52 | 193
Other, net | 718 | 202 | 2,367 | 1,673
Total non-operating expense | (22,472) | (89,751) | (33,546) | (93,777)
Income (loss) before income taxes | (5,237) | (67,760) | 21,092 | (24,861)
Income tax provision (benefit) | 4,185 | 6,306 | 9,325 | 13,368
Net income (loss) | (9,422) | (74,066) | 11,767 | (38,229)
Other comprehensive income (loss) | (7,752) | 16,924 | 21,156 | 18,907
Comprehensive income (loss) | $ (17,174) | $ (57,142) | $ 32,923 | $ (19,322)

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