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Supplemental Guarantor Financial Information - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 21, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | $ 451,993,000 |  | $ 432,099,000 |  | $ 880,772,000 | $ 869,051,000 |
Cost and expenses: |  |  |  |  |  |  |
Income (loss) from operations | 15,341,000 |  | 18,381,000 |  | 29,703,000 | 29,920,000 |
Interest expense, net | (10,914,000) |  | (7,723,000) |  | (19,400,000) | (15,743,000) |
Non-operating pension and other postretirment benefit (costs) income | (1,531,000) |  | (1,187,000) |  | (2,845,000) | (2,466,000) |
Earnings (loss) before income taxes | 2,896,000 |  | 9,471,000 |  | 7,458,000 | 11,711,000 |
Income tax (provision) benefit | (3,320,000) |  | (2,510,000) |  | (4,045,000) | (2,150,000) |
Equity in income (loss) of subsidiary | 0 |  | 0 |  | 0 | 0 |
Net earnings (loss) | (424,000) | $ 3,837,000 | 6,961,000 | $ 2,600,000 | 3,413,000 | 9,561,000 |
Other comprehensive income (loss), net of tax | 1,334,000 |  | 1,336,000 |  | 2,573,000 | 2,755,000 |
Comprehensive income | 910,000 |  | 8,297,000 |  | 5,986,000 | 12,316,000 |
Cost of sales | (409,825,000) |  | (387,154,000) |  | (794,071,000) | (779,587,000) |
Selling, general and administrative expenses | (26,827,000) |  | (26,564,000) |  | (56,998,000) | (59,544,000) |
Total operating costs and expenses | (436,652,000) |  | (413,718,000) |  | (851,069,000) | (839,131,000) |
Parent Company [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | 421,457,000 |  | 433,826,000 |  | 833,852,000 | 889,003,000 |
Cost and expenses: |  |  |  |  |  |  |
Income (loss) from operations | 14,591,000 |  | 18,340,000 |  | 28,489,000 | 32,928,000 |
Interest expense, net | (10,877,000) |  | (7,627,000) |  | (19,262,000) | (15,556,000) |
Non-operating pension and other postretirment benefit (costs) income | (1,531,000) |  | (1,187,000) |  | (2,845,000) | (2,466,000) |
Earnings (loss) before income taxes | 2,183,000 |  | 9,526,000 |  | 6,382,000 | 14,906,000 |
Income tax (provision) benefit | (1,969,000) |  | (2,574,000) |  | (3,775,000) | (2,956,000) |
Equity in income (loss) of subsidiary | 1,002,000 |  | 775,000 |  | 3,487,000 | 1,176,000 |
Net earnings (loss) | 1,216,000 |  | 7,727,000 |  | 6,094,000 | 13,126,000 |
Other comprehensive income (loss), net of tax | 1,334,000 |  | 1,336,000 |  | 2,573,000 | 2,755,000 |
Comprehensive income | 2,550,000 |  | 9,063,000 |  | 8,667,000 | 15,881,000 |
Cost of sales | (385,788,000) |  | (394,260,000) |  | (758,040,000) | (807,217,000) |
Selling, general and administrative expenses | (21,078,000) |  | (21,226,000) |  | (47,323,000) | (48,858,000) |
Total operating costs and expenses | (406,866,000) |  | (415,486,000) |  | (805,363,000) | (856,075,000) |
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | 67,685,000 |  | 54,313,000 |  | 135,225,000 | 100,526,000 |
Cost and expenses: |  |  |  |  |  |  |
Income (loss) from operations | 611,000 |  | 1,057,000 |  | 4,049,000 | 1,562,000 |
Interest expense, net | (37,000) |  | (96,000) |  | (138,000) | (187,000) |
Non-operating pension and other postretirment benefit (costs) income | 0 |  | 0 |  | 0 | 0 |
Earnings (loss) before income taxes | 574,000 |  | 961,000 |  | 3,911,000 | 1,375,000 |
Income tax (provision) benefit | 428,000 |  | (186,000) |  | (424,000) | (199,000) |
Equity in income (loss) of subsidiary | 0 |  | 0 |  | 0 | 0 |
Net earnings (loss) | 1,002,000 |  | 775,000 |  | 3,487,000 | 1,176,000 |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 | 0 |
Comprehensive income | 1,002,000 |  | 775,000 |  | 3,487,000 | 1,176,000 |
Cost of sales | (61,325,000) |  | (47,918,000) |  | (121,501,000) | (88,278,000) |
Selling, general and administrative expenses | (5,749,000) |  | (5,338,000) |  | (9,675,000) | (10,686,000) |
Total operating costs and expenses | (67,074,000) |  | (53,256,000) |  | (131,176,000) | (98,964,000) |
Eliminations |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Revenues | (37,149,000) |  | (56,040,000) |  | (88,305,000) | (120,478,000) |
Cost and expenses: |  |  |  |  |  |  |
Income (loss) from operations | 139,000 |  | (1,016,000) |  | (2,835,000) | (4,570,000) |
Interest expense, net | 0 |  | 0 |  | 0 | 0 |
Non-operating pension and other postretirment benefit (costs) income | 0 |  | 0 |  | 0 | 0 |
Earnings (loss) before income taxes | 139,000 |  | (1,016,000) |  | (2,835,000) | (4,570,000) |
Income tax (provision) benefit | (1,779,000) |  | 250,000 |  | 154,000 | 1,005,000 |
Equity in income (loss) of subsidiary | (1,002,000) |  | (775,000) |  | (3,487,000) | (1,176,000) |
Net earnings (loss) | (2,642,000) |  | (1,541,000) |  | (6,168,000) | (4,741,000) |
Other comprehensive income (loss), net of tax | 0 |  | 0 |  | 0 | 0 |
Comprehensive income | (2,642,000) |  | (1,541,000) |  | (6,168,000) | (4,741,000) |
Cost of sales | 37,288,000 |  | 55,024,000 |  | 85,470,000 | 115,908,000 |
Selling, general and administrative expenses | 0 |  | 0 |  | 0 | 0 |
Total operating costs and expenses | $ 37,288,000 |  | $ 55,024,000 |  | $ 85,470,000 | $ 115,908,000 |
Senior Notes Due Twenty Twenty-Three [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 275,000,000
Cost and expenses: |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.50%

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