Long-term Debt and Capital Lease Obligations Long-term and short-term debt (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014	Aug. 05, 2014	Aug. 04, 2014
Debt, Long-term and Short-term, Combined Amount [Abstract]
Short-term debt	$ 1,633,000	$ 602,000
Less portion due within one year	19,927,000	19,592,000
Long-term debt	237,325,000	296,282,000
Total debt	258,885,000	316,476,000
Current portion of capital lease	447,000	486,000
Long-term portion of capital lease	120,000	288,000
Capital lease facility	567,000	774,000
CoSine Communications, Inc. (CoSine) | Foreign Debt
Debt, Long-term and Short-term, Combined Amount [Abstract]
Short-term debt	798,000	0
HNH | Foreign Debt
Debt, Long-term and Short-term, Combined Amount [Abstract]
Short-term debt	835,000	602,000
Parent Company
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	257,252,000	315,874,000
Less portion due within one year	19,927,000	19,592,000
Long-term debt	237,325,000	296,282,000
Loans Payable | CoSine Communications, Inc. (CoSine) | Senior Notes
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	2,877,000	0
Loans Payable | CoSine Communications, Inc. (CoSine) | Revolving Credit Facility
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	23,737,000	0
Loans Payable | Steel Excel Inc. | Senior Notes
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	72,678,000	79,285,000
Loans Payable | HNH | Revolving Credit Facility
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	81,900,000	193,375,000	$ 40,000,000	$ 110,000,000
Loans Payable | Parent Company | Revolving Credit Facility
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	66,881,000	33,788,000
Other Domestic Debt | Parent Company
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	7,839,000	8,014,000
Foreign Line of Credit | Parent Company
Debt, Long-term and Short-term, Combined Amount [Abstract]
Total - Long-term debt - non - related parties	$ 1,340,000	$ 1,412,000