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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Income and Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Condensed Income Statements, Captions [Line Items] |  |
Net sales | $ 455,721 | $ 405,189
Energy and related sales, net | 5,262 | 1,101
Total revenues | 460,983 | 406,290
Costs of products sold | 405,943 | 348,915
Gross profit | 55,040 | 57,375
Selling, general and administrative expenses | 33,551 | 33,487
(Gains) losses on dispositions of plant, equipment and timberlands, net | (809) | (73)
Operating income | 22,298 | 23,961
Other non-operating income (expense) |  |
Interest expense | (4,812) | (3,841)
Interest income | 61 | 102
Other, net | 211 | 247
Total non-operating expense | (4,540) | (3,492)
Income before income taxes | 17,758 | 20,469
Income tax provision (benefit) | 3,110 | 4,840
Net income | 14,648 | 15,629
Other comprehensive income (loss) | 2,965 | (7,689)
Comprehensive income (loss) | 17,613 | 7,940
Adjustments/ Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | (18) | (5)
Energy and related sales, net |  |
Total revenues | (18) | (5)
Costs of products sold | (18) | (5)
Gross profit |  |
Selling, general and administrative expenses |  |
(Gains) losses on dispositions of plant, equipment and timberlands, net |  |
Operating income |  |
Other non-operating income (expense) |  |
Interest expense | 2,658 | 1,689
Interest income | (2,658) | (1,689)
Other, net | (22,499) | (12,445)
Total non-operating expense | (22,499) | (12,445)
Income before income taxes | (22,499) | (12,445)
Income tax provision (benefit) |  |
Net income | (22,499) | (12,445)
Other comprehensive income (loss) | (886) | 12,586
Comprehensive income (loss) | (23,385) | 141
Parent Company [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 225,831 | 227,116
Energy and related sales, net | 5,262 | 1,101
Total revenues | 231,093 | 228,217
Costs of products sold | 216,716 | 198,947
Gross profit | 14,377 | 29,270
Selling, general and administrative expenses | 17,793 | 21,128
(Gains) losses on dispositions of plant, equipment and timberlands, net | (812) | (73)
Operating income | (2,604) | 8,215
Other non-operating income (expense) |  |
Interest expense | (4,739) | (4,716)
Interest income | 153 | 84
Other, net | 21,618 | 11,956
Total non-operating expense | 17,032 | 7,324
Income before income taxes | 14,428 | 15,539
Income tax provision (benefit) | (220) | (90)
Net income | 14,648 | 15,629
Other comprehensive income (loss) | 2,965 | (7,689)
Comprehensive income (loss) | 17,613 | 7,940
Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 18 | 6
Energy and related sales, net |  |
Total revenues | 18 | 6
Costs of products sold | 17 | 5
Gross profit | 1 | 1
Selling, general and administrative expenses | 13 | 14
(Gains) losses on dispositions of plant, equipment and timberlands, net |  |
Operating income | (12) | (13)
Other non-operating income (expense) |  |
Interest expense |  |
Interest income | 2,559 | 1,689
Other, net | 10 | (4)
Total non-operating expense | 2,569 | 1,685
Income before income taxes | 2,557 | 1,672
Income tax provision (benefit) | 913 | 675
Net income | 1,644 | 997
Other comprehensive income (loss) | 1 | (4,608)
Comprehensive income (loss) | 1,645 | (3,611)
Non Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 229,890 | 178,072
Energy and related sales, net |  |
Total revenues | 229,890 | 178,072
Costs of products sold | 189,228 | 149,968
Gross profit | 40,662 | 28,104
Selling, general and administrative expenses | 15,745 | 12,345
(Gains) losses on dispositions of plant, equipment and timberlands, net | 3 |
Operating income | 24,914 | 15,759
Other non-operating income (expense) |  |
Interest expense | (2,731) | (814)
Interest income | 7 | 18
Other, net | 1,082 | 740
Total non-operating expense | (1,642) | (56)
Income before income taxes | 23,272 | 15,703
Income tax provision (benefit) | 2,417 | 4,255
Net income | 20,855 | 11,448
Other comprehensive income (loss) | 885 | (7,978)
Comprehensive income (loss) | $ 21,740 | $ 3,470

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