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Inventory (Details) (USD $)
Dec. 31, 2013
Mar. 31, 2013
May 31, 2013
Fenco [Member]
Non-core inventory [Abstract]      
Raw materials $ 14,985,000 $ 14,152,000  
Work-in-process 94,000 137,000  
Finished goods 29,845,000 19,239,000  
Non-core inventory, gross 44,924,000 33,528,000  
Less allowance for excess and obsolete inventory (1,704,000) (1,690,000)  
Total 43,220,000 31,838,000  
Inventory unreturned 7,199,000 6,981,000  
Long-term core inventory [Abstract]      
Used cores held at the Company's facilities 24,460,000 22,227,000  
Used cores expected to be returned by customers 7,075,000 5,147,000  
Remanufactured cores held in finished goods 16,965,000 15,019,000  
Remanufactured cores held at customers' locations 87,138,000 76,626,000  
Long-term core inventory - gross 135,638,000 119,019,000  
Less allowance for excess and obsolete inventory (1,121,000) (808,000)  
Total 134,517,000 118,211,000  
Long-term core inventory deposits 28,857,000 27,610,000  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Non-core inventory, deconsolidated     25,731,000
Disposal Group, Including Discontinued Operation, Inventory Unreturned     5,321,000
Disposal Group, Including Discontinued Operation, Long-term Core Inventory, Net     $ 40,471,000