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Investments and Restricted Deposits (Detail) - Schedule Of Financial Information For Equity Method Investments (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Big River [Member]
Jun. 30, 2011
Big River [Member]
Jun. 30, 2012
Big River [Member]
Jun. 30, 2011
Big River [Member]
Jun. 30, 2012
Patriot [Member]
Jun. 30, 2011
Patriot [Member]
Jun. 30, 2012
Patriot [Member]
Jun. 30, 2011
Patriot [Member]
Jul. 31, 2011
NuGen Energy [Member]
Jul. 31, 2011
NuGen Energy [Member]
Net sales and revenue $ 258,848 $ 236,478 $ 549,851 $ 478,706 $ 81,578 $ 101,650 $ 171,389 $ 189,966 $ 86,913 $ 168,051
Gross profit (loss) 8,507 8,402 22,515 31,473 (569) 4,071 1,208 9,534 6,103 14,992
Income (loss) from continuing operations 1,068 16,305 6,786 29,334 (2,209) 2,012 (2,645) 5,888 3,893 11,743
Net income (loss) $ 1,068 $ 16,305 $ 6,786 $ 29,334 $ (2,209) $ 2,012 $ (2,645) $ 5,888 $ 3,893 $ 11,743