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Debt - Narrative (Details)
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended 16 Months Ended 25 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Day
subsidiary
$ / shares
Sep. 30, 2018
USD ($)
May 31, 2020
Sep. 30, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
CNY (¥)
Jun. 01, 2018
USD ($)
Aug. 31, 2017
USD ($)
Debt Instrument [Line Items]                          
Number of subsidiaries | subsidiary       4                  
Noncash interest paid in kind       $ 11,810,000 $ 9,755,000                
Unamortized debt issuance costs $ 322,000   $ 422,000 322,000     $ 322,000 $ 422,000 $ 322,000        
Short-term borrowings 4,028,000   5,498,000 4,028,000     4,028,000 5,498,000 4,028,000        
5.00% / 7.00% Second Lien Notes due August 31, 2022                          
Debt Instrument [Line Items]                          
Noncash interest paid in kind               12,217,000 21,881,000        
5.00% / 7.00% Second Lien Notes due August 31, 2022 $ 190,325,000   180,894,000 $ 190,325,000     $ 190,325,000 180,894,000 $ 190,325,000        
Debt repurchase price (as a percent)       100.00%                  
5.00% / 7.00% Second Lien Notes due August 31, 2022 | Minimum                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 5.00%     5.00%     5.00%   5.00% 5.00% 5.00%    
5.00% / 7.00% Second Lien Notes due August 31, 2022 | Maximum                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 7.00%     7.00%     7.00%   7.00% 7.00% 7.00%    
Second Lien Notes                          
Debt Instrument [Line Items]                          
Debt conversion price (in dollars per share) | $ / shares $ 3.77     $ 3.77     $ 3.77   $ 3.77        
A.M. Castle & Co. 2017 Management Incentive Plan | Second Lien Notes                          
Debt Instrument [Line Items]                          
5.00% / 7.00% Second Lien Notes due August 31, 2022                         $ 2,400,000
Line of Credit | Revolving A Credit Facility | LIBOR                          
Debt Instrument [Line Items]                          
Interest rate margin (as a percent)       3.00%                  
Line of Credit | Revolving B Credit Facility                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 12.00%     12.00%     12.00%   12.00% 12.00% 12.00%    
Noncash interest paid in kind $ 744,000 $ 558,000 1,375,000 $ 2,145,000 738,000   $ 3,521,000            
Line of credit 25,021,000   22,875,000 25,021,000     25,021,000 22,875,000 $ 25,021,000        
Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022                          
Debt Instrument [Line Items]                          
Line of credit 107,500,000   108,488,000 107,500,000     $ 107,500,000 108,488,000 $ 107,500,000        
Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022 | Scenario, Forecast                          
Debt Instrument [Line Items]                          
Early redemption fee (as a percent)           0.25%              
Convertible Debt | 5.00% / 7.00% Second Lien Notes due August 31, 2022                          
Debt Instrument [Line Items]                          
Noncash interest paid in kind $ 3,277,000 $ 3,058,000   $ 9,664,000 $ 9,017,000                
Aggregate principal amount                         164,902,000
Debt term       5 years                  
Debt conversion price (in dollars per share) | $ / shares $ 3.77     $ 3.77     $ 3.77   $ 3.77        
Number of trading days in observation period | Day       20                  
Principal amount for conversion price calculation $ 1.00     $ 1.00     $ 1.00   $ 1.00        
Threshold percentage of acquisition of stock by person or group 50.00%     50.00%     50.00%   50.00% 50.00% 50.00%    
Percentage aggregate principal holder consent required to release lien 66.66%     66.66%     66.66%   66.66% 66.66% 66.66%    
Convertible Debt | 5.00% / 7.00% Second Lien Notes due August 31, 2022 | Minimum                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 5.00%     5.00%     5.00%   5.00% 5.00% 5.00%    
Convertible Debt | 5.00% / 7.00% Second Lien Notes due August 31, 2022 | Maximum                          
Debt Instrument [Line Items]                          
Stated interest rate (as a percent) 7.00%     7.00%     7.00%   7.00% 7.00% 7.00%    
Foreign Line of Credit                          
Debt Instrument [Line Items]                          
Line of credit capacity | €                   € 6,500,000      
Eligible accounts receivable (as a percent)       100.00%                  
Factoring fee (as a percent)       0.16%                  
Line of credit $ 3,236,000   $ 5,498,000 $ 3,236,000     $ 3,236,000 $ 5,498,000 $ 3,236,000        
Foreign Line of Credit | LIBOR                          
Debt Instrument [Line Items]                          
Interest rate margin (as a percent)       1.00%                  
Foreign Line of Credit | Euribor                          
Debt Instrument [Line Items]                          
Interest rate margin (as a percent)       1.00%                  
Revolving Credit Facility | Line of Credit | Revolving B Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit capacity                       $ 25,000,000  
Revolving Credit Facility | Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022                          
Debt Instrument [Line Items]                          
Line of credit capacity                         $ 125,000,000
Commitment fee on unused capacity (as a percent)       0.25%                  
Average daily revolving facility threshold       50.00%                  
Interest rate during period (as a percent) 5.29% 5.21%   5.47% 4.74%                
Fixed charge ratio 1.0     1.0     1.0   1.0 1.0 1.0    
Covenant borrowing threshold (less than)       $ 12,500,000                  
Revolving Credit Facility | Line of Credit | Floating rate Revolving A Credit Facility due February 28, 2022 | Maximum                          
Debt Instrument [Line Items]                          
Commitment fee on unused capacity (as a percent)       0.375%                  
Line of Credit | Revolving Credit Facility | Chinese Local Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit capacity | ¥                     ¥ 25,000,000    
Stated interest rate (as a percent) 4.79%     4.79%     4.79%   4.79% 4.79% 4.79%    
Short-term borrowings $ 792,000     $ 792,000     $ 792,000   $ 792,000