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INVESTMENTS AND DEPOSITS (Detail) - Schedule of Condensed Balance Sheet (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Dec. 31, 2012
Patriot [Member]
Dec. 31, 2011
Patriot [Member]
Dec. 31, 2012
Big River [Member]
Dec. 31, 2011
Big River [Member]
Current assets $ 114,927 $ 127,039 $ 22,302 $ 24,972 $ 139,879 $ 139,858
Non current assets     161,319 168,518 375,803 406,522
Total assets     183,621 193,490 515,682 546,380
Current liabilities 31,459 37,241 20,201 20,966 90,865 72,798
Long-term liabilities     65,867 76,103 87,301 111,928
Total liabilities     86,068 97,069 178,166 184,726
Noncontrolling interests $ 27,931 $ 29,332     $ 29,007 $ 33,224