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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |
Net sales | $ 402,218 | $ 417,469
Energy and related sales, net | 666 | 2,068
Total revenues | 402,884 | 419,537
Costs of products sold | 345,041 | 367,429
Gross profit | 57,843 | 52,108
Selling, general and administrative expenses | 31,858 | 31,272
Losses (gains) on dispositions of plant, equipment and timberlands, net | 24 | (2,654)
Operating income | 25,961 | 23,490
Other non-operating income (expense) |  |
Interest expense | (4,116) | (4,508)
Interest income | 91 | 65
Other, net | (700) | (187)
Total non-operating expense | (4,725) | (4,630)
Income before income taxes | 21,236 | 18,860
Income tax provision | 5,068 | 4,935
Net income | 16,168 | 13,925
Other comprehensive income | 15,742 | (35,285)
Comprehensive income | 31,910 | (21,360)
Adjustments/ Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | (18,782) | (20,655)
Total revenues | (18,782) | (20,655)
Costs of products sold | (18,782) | (20,655)
Other non-operating income (expense) |  |
Interest expense | 1,086 | 6,703
Interest income | (1,086) | (6,702)
Equity in earnings of subsidiaries | (24,626) | (27,278)
Other, net |  | (1)
Total non-operating expense | (24,626) | (27,278)
Income before income taxes | (24,626) | (27,278)
Net income | (24,626) | (27,278)
Other comprehensive income | (26,670) | (298)
Comprehensive income | (51,296) | (27,576)
Parent Company [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 217,888 | 219,876
Energy and related sales, net | 666 | 2,068
Total revenues | 218,554 | 221,944
Costs of products sold | 191,959 | 203,682
Gross profit | 26,595 | 18,262
Selling, general and administrative expenses | 18,445 | 17,182
Losses (gains) on dispositions of plant, equipment and timberlands, net | 2 | (1,471)
Operating income | 8,148 | 2,551
Other non-operating income (expense) |  |
Interest expense | (4,415) | (4,817)
Interest income | 181 | 163
Equity in earnings of subsidiaries | 12,872 | 17,084
Other, net | (542) | (715)
Total non-operating expense | 8,096 | 11,715
Income before income taxes | 16,244 | 14,266
Income tax provision | 76 | 341
Net income | 16,168 | 13,925
Other comprehensive income | 15,742 | (35,285)
Comprehensive income | 31,910 | (21,360)
Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 18,646 | 20,150
Total revenues | 18,646 | 20,150
Costs of products sold | 18,050 | 19,334
Gross profit | 596 | 816
Selling, general and administrative expenses | (185) | 497
Losses (gains) on dispositions of plant, equipment and timberlands, net |  | (1,183)
Operating income | 781 | 1,502
Other non-operating income (expense) |  |
Interest income | 992 | 6,599
Equity in earnings of subsidiaries | 11,754 | 10,194
Other, net | 20 | (130)
Total non-operating expense | 12,766 | 16,663
Income before income taxes | 13,547 | 18,165
Income tax provision | 675 | 1,081
Net income | 12,872 | 17,084
Other comprehensive income | 13,553 | (38,550)
Comprehensive income | 26,425 | (21,466)
Non Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 184,466 | 198,098
Total revenues | 184,466 | 198,098
Costs of products sold | 153,814 | 165,068
Gross profit | 30,652 | 33,030
Selling, general and administrative expenses | 13,598 | 13,593
Losses (gains) on dispositions of plant, equipment and timberlands, net | 22 |
Operating income | 17,032 | 19,437
Other non-operating income (expense) |  |
Interest expense | (787) | (6,394)
Interest income | 4 | 5
Other, net | (178) | 659
Total non-operating expense | (961) | (5,730)
Income before income taxes | 16,071 | 13,707
Income tax provision | 4,317 | 3,513
Net income | 11,754 | 10,194
Other comprehensive income | 13,117 | 38,848
Comprehensive income | $ 24,871 | $ 49,042

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