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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%