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Financial Results by Quarter (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Financial Information [Line Items]                      
Net sales $ 466,391 $ 501,125 $ 494,627 $ 465,830 $ 345,557 $ 352,927 $ 343,860 $ 330,621 $ 1,927,973 $ 1,372,965 $ 1,250,069
Costs and expenses:                      
Cost of sales (405,325) (448,927) (433,358) (414,920) (281,883) (303,542) (286,415) (301,964) (1,702,530) (1,173,804) (1,052,151)
Selling, general and administrative expenses (28,343) (26,815) (27,476) (27,364) (41,270) (20,886) (20,145) (18,093) (109,998) (100,394) (71,125)
Total operating costs and expenses (433,668) (475,742) (460,834) (442,284) (323,153) (324,428) (306,560) (320,057) (1,812,528) (1,274,198) (1,123,276)
Income from operations 32,723 25,383 33,793 23,546 22,404 28,499 37,300 10,564 115,445 98,767 297,440
Net earnings $ 11,502 $ 8,645 $ 13,923 $ 5,604 $ 37,786 $ 14,988 $ 20,568 $ 458 $ 39,674 $ 73,800 $ 182,464
Net earnings per common share                      
Basic $ 0.51 $ 0.38 $ 0.60 $ 0.25 $ 1.65 $ 0.65 $ 0.90 $ 0.02 $ 1.73 $ 3.22 $ 8.03
Diluted $ 0.48 $ 0.37 $ 0.59 $ 0.24 $ 1.60 $ 0.64 $ 0.87 $ 0.02 $ 1.66 $ 3.12 $ 7.75