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Relationships Customer Relationships [Member] Debt issuance costs Payment (Reimbursement) Of Debt Issuance Costs Payment (Reimbursement) Of Debt Issuance Costs Other (expense) income Disposal Group, Including Discontinued Operation, Non Operating Income (Expense) Disposal Group, Including Discontinued Operation, Non Operating Income (Expense) Entity Address, City or Town Entity Address, City or Town Change in fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value, Revaluation Amount Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value, Revaluation Amount Pension liabilities, accrued postretirement benefits and employee benefits Increase Decrease In Pension Postretirement And Accrued Employee Benefits Increase Decrease In Pension Postretirement And Accrued Employee Benefits Babcock & Wilcox Enterprises, Inc. Babcock & Wilcox Enterprises, Inc. [Member] Babcock & Wilcox Enterprises, Inc. 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Riley Securities, Inc. B. Riley Securities, Inc. [Member] B. Riley Securities, Inc. 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