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Share-based Compensation - Narrative (Details)
9 Months Ended
Sep. 10, 2018
shares
Apr. 25, 2018
Sep. 01, 2017
shares
Sep. 30, 2019
USD ($)
shares
Aug. 31, 2017
USD ($)
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense | $       $ 0  
PSUs outstanding (in shares) | shares       791,000  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense | $       $ 1,381,000  
Weighted average recognition period       10 months 24 days  
A.M. Castle & Co. 2017 Management Incentive Plan | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance share units granted (in shares) | shares 664,000        
A.M. Castle & Co. 2017 Management Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares convertible (in shares) | shares     638,000    
Award vesting period   1 year 3 years    
Performance share units granted (in shares) | shares       15,000  
Second Lien Notes | A.M. Castle & Co. 2017 Management Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
5.00% / 7.00% Second Lien Notes due August 31, 2022 | $         $ 2,400,000
Unrecognized compensation expense | $       $ 567,000  
Weighted average recognition period       10 months 24 days  
Vesting period       3 years  
Vesting Upon Achievement of Defined Enterprise Value          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting of share awards (as a percent)       50.00%  
Vesting Upon Achievement of the Defined Enterprise Value          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting of share awards (as a percent)       50.00%