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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Condensed Income Statements, Captions [Line Items] |  |
Net sales | $ 390,713 | $ 402,218
Energy and related sales, net | 1,129 | 666
Total revenues | 391,842 | 402,884
Costs of products sold | 334,913 | 345,041
Gross profit | 56,929 | 57,843
Selling, general and administrative expenses | 35,086 | 31,858
Losses on dispositions of plant, equipment and timberlands, net | 32 | 24
Operating income | 21,811 | 25,961
Other non-operating income (expense) |  |
Interest expense | (4,008) | (4,116)
Interest income | 113 | 91
Other, net | (279) | (700)
Total non-operating expense | (4,174) | (4,725)
Income before income taxes | 17,637 | 21,236
Income tax provision | 6,034 | 5,068
Net income | 11,603 | 16,168
Other comprehensive income | 7,193 | 15,742
Comprehensive income | 18,796 | 31,910
Parent Company [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 205,771 | 217,888
Energy and related sales, net | 1,129 | 666
Total revenues | 206,900 | 218,554
Costs of products sold | 183,946 | 191,959
Gross profit | 22,954 | 26,595
Selling, general and administrative expenses | 20,371 | 18,445
Losses on dispositions of plant, equipment and timberlands, net | 32 | 2
Operating income | 2,551 | 8,148
Other non-operating income (expense) |  |
Interest expense | (4,661) | (4,415)
Interest income | 149 | 181
Equity in earnings of subsidiaries | 13,617 | 12,872
Other, net | 493 | (542)
Total non-operating expense | 9,598 | 8,096
Income before income taxes | 12,149 | 16,244
Income tax provision | 546 | 76
Net income | 11,603 | 16,168
Other comprehensive income | 7,193 | 15,742
Comprehensive income | 18,796 | 31,910
Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 19,533 | 18,646
Total revenues | 19,533 | 18,646
Costs of products sold | 18,586 | 18,050
Gross profit | 947 | 596
Selling, general and administrative expenses | 74 | (185)
Operating income | 873 | 781
Other non-operating income (expense) |  |
Interest expense | (113) |
Interest income | 1,161 | 992
Equity in earnings of subsidiaries | 13,852 | 11,754
Other, net | (2,206) | 20
Total non-operating expense | 12,694 | 12,766
Income before income taxes | 13,567 | 13,547
Income tax provision | (50) | 675
Net income | 13,617 | 12,872
Other comprehensive income | 5,102 | 13,553
Comprehensive income | 18,719 | 26,425
Non Guarantors [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | 185,887 | 184,466
Total revenues | 185,887 | 184,466
Costs of products sold | 152,859 | 153,814
Gross profit | 33,028 | 30,652
Selling, general and administrative expenses | 14,641 | 13,598
Losses on dispositions of plant, equipment and timberlands, net |  | 22
Operating income | 18,387 | 17,032
Other non-operating income (expense) |  |
Interest expense | (504) | (787)
Interest income | 73 | 4
Other, net | 1,434 | (178)
Total non-operating expense | 1,003 | (961)
Income before income taxes | 19,390 | 16,071
Income tax provision | 5,538 | 4,317
Net income | 13,852 | 11,754
Other comprehensive income | 5,014 | 13,117
Comprehensive income | 18,866 | 24,871
Adjustments/ Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Net sales | (20,478) | (18,782)
Total revenues | (20,478) | (18,782)
Costs of products sold | (20,478) | (18,782)
Other non-operating income (expense) |  |
Interest expense | 1,270 | 1,086
Interest income | (1,270) | (1,086)
Equity in earnings of subsidiaries | (27,469) | (24,626)
Total non-operating expense | (27,469) | (24,626)
Income before income taxes | (27,469) | (24,626)
Net income | (27,469) | (24,626)
Other comprehensive income | (10,116) | (26,670)
Comprehensive income | $ (37,585) | $ (51,296)

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