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Share-based Compensation - Narrative (Details)
3 Months Ended
Sep. 10, 2018
shares
Apr. 25, 2018
Sep. 01, 2017
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense | $       $ 0
PSUs outstanding (in shares) | shares       654,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense | $       $ 2,122,000
Weighted average recognition period       1 year 4 months 13 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 | 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  
Granted (in dollars per share) | $ / shares       $ 0.00
Performance share units granted | shares       0
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 | $       $ 876,000
Weighted average recognition period       1 year 5 months
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)       100.00%