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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 410,803 | $ 445,341 | $ 828,272 | $ 901,062
Energy and related sales, net | 715 | 790 | 2,783 | 6,052
Total revenues | 411,518 | 446,131 | 831,055 | 907,114
Costs of products sold | 378,685 | 404,694 | 746,114 | 810,637
Gross profit | 32,833 | 41,437 | 84,941 | 96,477
Selling, general and administrative expenses | 29,137 | 32,314 | 60,409 | 65,865
Gains on dispositions of plant, equipment and timberlands, net | (111) | (1,482) | (2,765) | (2,291)
Operating income | 3,807 | 10,605 | 27,297 | 32,903
Other non-operating income (expense) |  |  |  |
Interest expense | (4,352) | (4,762) | (8,860) | (9,574)
Interest income | 77 | 52 | 142 | 113
Other, net | 215 | 61 | 28 | 272
Total non-operating expense | (4,060) | (4,649) | (8,690) | (9,189)
Income (loss) before income taxes | (253) | 5,956 | 18,607 | 23,714
Income tax provision (benefit) | (3,101) | 1,287 | 1,834 | 4,397
Net income | 2,848 | 4,669 | 16,773 | 19,317
Other comprehensive income (loss) | 17,087 | 3,026 | (18,198) | 5,991
Comprehensive income (loss) | 19,935 | 7,695 | (1,425) | 25,308
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  | (5) |  | (21)
Total revenues |  | (5) |  | (21)
Costs of products sold |  | (5) |  | (21)
Other non-operating income (expense) |  |  |  |
Interest expense | 6,626 | 2,809 | 13,329 | 5,465
Interest income | (6,626) | (2,809) | (13,328) | (5,465)
Equity in earnings of subsidiaries | (29,640) | (34,503) | (55,478) | (77,464)
Other, net |  | (1) | (1) |
Total non-operating expense | (29,640) | (34,504) | (55,478) | (77,464)
Income (loss) before income taxes | (29,640) | (34,504) | (55,478) | (77,464)
Net income | (29,640) | (34,504) | (55,478) | (77,464)
Other comprehensive income (loss) | (3,722) | (548) | (4,020) | (1,434)
Comprehensive income (loss) | (33,362) | (35,052) | (59,498) | (78,898)
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 212,920 | 217,864 | 432,796 | 443,695
Energy and related sales, net | 715 | 790 | 2,783 | 6,052
Total revenues | 213,635 | 218,654 | 435,579 | 449,747
Costs of products sold | 213,316 | 215,756 | 415,835 | 432,472
Gross profit | 319 | 2,898 | 19,744 | 17,275
Selling, general and administrative expenses | 15,661 | 16,555 | 32,843 | 34,347
Gains on dispositions of plant, equipment and timberlands, net | (51) | (162) | (1,522) | (974)
Operating income | (15,291) | (13,495) | (11,577) | (16,098)
Other non-operating income (expense) |  |  |  |
Interest expense | (4,608) | (4,756) | (9,425) | (9,494)
Interest income | 169 | 164 | 332 | 316
Equity in earnings of subsidiaries | 17,879 | 19,021 | 34,242 | 41,520
Other, net | (745) | (338) | (1,460) | (1,220)
Total non-operating expense | 12,695 | 14,091 | 23,689 | 31,122
Income (loss) before income taxes | (2,596) | 596 | 12,112 | 15,024
Income tax provision (benefit) | (5,444) | (4,073) | (4,661) | (4,293)
Net income | 2,848 | 4,669 | 16,773 | 19,317
Other comprehensive income (loss) | 17,087 | 3,026 | (18,198) | 5,991
Comprehensive income (loss) | 19,935 | 7,695 | (1,425) | 25,308
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales |  | 4 |  | 21
Total revenues |  | 4 |  | 21
Costs of products sold |  | 4 |  | 21
Selling, general and administrative expenses | 15 | 143 | 205 | 156
Gains on dispositions of plant, equipment and timberlands, net |  | (1,316) | (1,183) | (1,317)
Operating income | (15) | 1,173 | 978 | 1,161
Other non-operating income (expense) |  |  |  |
Interest income | 6,498 | 2,656 | 13,097 | 5,214
Equity in earnings of subsidiaries | 11,761 | 15,482 | 21,236 | 35,944
Other, net | (20) | 11 | (146) | 21
Total non-operating expense | 18,239 | 18,149 | 34,187 | 41,179
Income (loss) before income taxes | 18,224 | 19,322 | 35,165 | 42,340
Income tax provision (benefit) | 445 | 715 | 1,349 | 1,628
Net income | 17,779 | 18,607 | 33,816 | 40,712
Other comprehensive income (loss) | 13,680 | (550) | (24,870) | (549)
Comprehensive income (loss) | 31,459 | 18,057 | 8,946 | 40,163
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 197,883 | 227,478 | 395,476 | 457,367
Total revenues | 197,883 | 227,478 | 395,476 | 457,367
Costs of products sold | 165,369 | 188,939 | 330,279 | 378,165
Gross profit | 32,514 | 38,539 | 65,197 | 79,202
Selling, general and administrative expenses | 13,461 | 15,616 | 27,361 | 31,362
Gains on dispositions of plant, equipment and timberlands, net | (60) | (4) | (60) |
Operating income | 19,113 | 22,927 | 37,896 | 47,840
Other non-operating income (expense) |  |  |  |
Interest expense | (6,370) | (2,815) | (12,764) | (5,545)
Interest income | 36 | 41 | 41 | 48
Other, net | 980 | 389 | 1,635 | 1,471
Total non-operating expense | (5,354) | (2,385) | (11,088) | (4,026)
Income (loss) before income taxes | 13,759 | 20,542 | 26,808 | 43,814
Income tax provision (benefit) | 1,898 | 4,645 | 5,146 | 7,062
Net income | 11,861 | 15,897 | 21,662 | 36,752
Other comprehensive income (loss) | (9,958) | 1,098 | 28,890 | 1,983
Comprehensive income (loss) | $ 1,903 | $ 16,995 | $ 50,552 | $ 38,735

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