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Guarantor Financial Statements - Condensed Consolidating Statements of Income and Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | $ 456,648 | $ 404,354 | $ 1,287,804 | $ 1,186,399
Energy and related sales - net | 1,196 | 1,867 | 2,721 | 5,358
Total revenues | 457,844 | 406,221 | 1,290,525 | 1,191,757
Costs of products sold | 391,805 | 347,029 | 1,126,271 | 1,030,717
Gross profit | 66,039 | 59,192 | 164,254 | 161,040
Selling, general and administrative expenses | 34,480 | 29,380 | 102,495 | 89,460
Gains on dispositions of plant, equipment and timberlands, net | (282) | (1,473) | (374) | (8,471)
Operating income | 31,841 | 31,285 | 62,133 | 80,051
Other non-operating income (expense) |  |  |  |
Interest expense | (4,788) | (4,152) | (13,143) | (12,580)
Interest income | 92 | 106 | 240 | 332
Other, net | (34) | (4) | 388 | 295
Total non-operating expense | (4,730) | (4,050) | (12,515) | (11,953)
Income (loss) before income taxes | 27,111 | 27,235 | 49,618 | 68,098
Income tax provision (benefit) | (7,008) | 7,136 | (1,063) | 15,689
Net income (loss) | 34,119 | 20,099 | 50,681 | 52,409
Other comprehensive income | 17,903 | 11,566 | 17,319 | 12,598
Comprehensive income (loss) | 52,022 | 31,665 | 68,000 | 65,007
Parent Company [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 225,690 | 232,620 | 669,792 | 670,536
Energy and related sales - net | 1,196 | 1,867 | 2,721 | 5,358
Total revenues | 226,886 | 234,487 | 672,513 | 675,894
Costs of products sold | 201,414 | 203,084 | 614,507 | 596,508
Gross profit | 25,472 | 31,403 | 58,006 | 79,386
Selling, general and administrative expenses | 15,716 | 16,842 | 52,640 | 51,570
Gains on dispositions of plant, equipment and timberlands, net | (3) | 16 | (17) | (506)
Operating income | 9,759 | 14,545 | 5,383 | 28,322
Other non-operating income (expense) |  |  |  |
Interest expense | (3,885) | (4,152) | (11,573) | (12,575)
Interest income | (621) | (765) | (2,031) | (2,129)
Other, net | 19,377 | 12,016 | 45,342 | 36,817
Total non-operating expense | 14,871 | 7,099 | 31,738 | 22,113
Income (loss) before income taxes | 24,630 | 21,644 | 37,121 | 50,435
Income tax provision (benefit) | (9,489) | 1,545 | (13,560) | (1,974)
Net income (loss) | 34,119 | 20,099 | 50,681 | 52,409
Other comprehensive income | 17,903 | 11,566 | 17,319 | 12,598
Comprehensive income (loss) | 52,022 | 31,665 | 68,000 | 65,007
Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 12,688 | 13,936 | 40,988 | 41,307
Energy and related sales - net |  |  |  |
Total revenues | 12,688 | 13,936 | 40,988 | 41,307
Costs of products sold | 10,907 | 12,472 | 35,843 | 37,524
Gross profit | 1,781 | 1,464 | 5,145 | 3,783
Selling, general and administrative expenses | 677 | 880 | 1,909 | 2,220
Gains on dispositions of plant, equipment and timberlands, net | (282) | (1,489) | (357) | (7,940)
Operating income | 1,386 | 2,073 | 3,593 | 9,503
Other non-operating income (expense) |  |  |  |
Interest expense |  |  |  |
Interest income | 2,344 | 1,779 | 5,697 | 5,121
Other, net | 162 | 269 | 283 | 642
Total non-operating expense | 2,506 | 2,048 | 5,980 | 5,763
Income (loss) before income taxes | 3,892 | 4,121 | 9,573 | 15,266
Income tax provision (benefit) | (364) | 1,637 | 1,210 | 6,523
Net income (loss) | 4,256 | 2,484 | 8,363 | 8,743
Other comprehensive income | 6,400 | 3,923 | 3,171 | 1,815
Comprehensive income (loss) | 10,656 | 6,407 | 11,534 | 10,558
Non Guarantors [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | 230,958 | 171,734 | 618,012 | 515,874
Energy and related sales - net |  |  |  |
Total revenues | 230,958 | 171,734 | 618,012 | 515,874
Costs of products sold | 192,209 | 145,377 | 516,747 | 437,945
Gross profit | 38,749 | 26,357 | 101,265 | 77,929
Selling, general and administrative expenses | 18,087 | 11,658 | 47,946 | 35,670
Gains on dispositions of plant, equipment and timberlands, net | 3 |  |  | (25)
Operating income | 20,659 | 14,699 | 53,319 | 42,284
Other non-operating income (expense) |  |  |  |
Interest expense | (903) |  | (1,570) | (5)
Interest income | (1,631) | (908) | (3,426) | (2,660)
Other, net | (587) | 238 | 868 | 1,099
Total non-operating expense | (3,121) | (670) | (4,128) | (1,566)
Income (loss) before income taxes | 17,538 | 14,029 | 49,191 | 40,718
Income tax provision (benefit) | 2,827 | 3,967 | 11,353 | 11,165
Net income (loss) | 14,711 | 10,062 | 37,838 | 29,553
Other comprehensive income | (219) | 5,356 | (5,078) | 1,366
Comprehensive income (loss) | 14,492 | 15,418 | 32,760 | 30,919
Adjustments/ Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Net sales | (12,688) | (13,936) | (40,988) | (41,318)
Energy and related sales - net |  |  |  |
Total revenues | (12,688) | (13,936) | (40,988) | (41,318)
Costs of products sold | (12,725) | (13,904) | (40,826) | (41,260)
Gross profit | 37 | (32) | (162) | (58)
Selling, general and administrative expenses |  |  |  |
Gains on dispositions of plant, equipment and timberlands, net |  |  |  |
Operating income | 37 | (32) | (162) | (58)
Other non-operating income (expense) |  |  |  |
Interest expense |  |  |  |
Interest income |  |  |  |
Other, net | (18,986) | (12,527) | (46,105) | (38,263)
Total non-operating expense | (18,986) | (12,527) | (46,105) | (38,263)
Income (loss) before income taxes | (18,949) | (12,559) | (46,267) | (38,321)
Income tax provision (benefit) | 18 | (13) | (66) | (25)
Net income (loss) | (18,967) | (12,546) | (46,201) | (38,296)
Other comprehensive income | (6,181) | (9,279) | 1,907 | (3,181)
Comprehensive income (loss) | $ (25,148) | $ (21,825) | $ (44,294) | $ (41,477)

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