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BUSINESS SEGMENT INFORMATION - Summarized Financial Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
segments
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Number of Reportable Segments 4    
Revenues $ 180,202 $ 161,448  
Restructuring charges 397 0  
Operating income (loss) 8,053 5,734  
Depreciation, depletion and amortization 16,059 14,426  
Total assets 1,407,147 943,015 946,685
Capital expenditures 3,050 5,301  
Coal Segment
     
Segment Reporting Information [Line Items]      
Revenues 158,190 142,112  
Restructuring charges 0    
Operating income (loss) 13,447 13,472  
Depreciation, depletion and amortization 13,459 11,801  
Total assets 697,916 711,128  
Capital expenditures 3,053 5,010  
Power Segment
     
Segment Reporting Information [Line Items]      
Revenues 22,012 19,336  
Restructuring charges 397    
Operating income (loss) 1,744 (1,003)  
Depreciation, depletion and amortization 2,524 2,531  
Total assets 167,998 186,309  
Capital expenditures 35 134  
Heritage Segment
     
Segment Reporting Information [Line Items]      
Revenues 0 0  
Restructuring charges 0    
Operating income (loss) (3,830) (4,175)  
Depreciation, depletion and amortization 0 0  
Total assets 15,622 15,877  
Capital expenditures 0 0  
Corporate Segment
     
Segment Reporting Information [Line Items]      
Revenues 0 0  
Restructuring charges 0    
Operating income (loss) (3,308) (2,560)  
Depreciation, depletion and amortization 76 94  
Total assets 525,611 29,701  
Capital expenditures $ (38) $ 157