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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Authorized Shares
The Company maintains the 2008 A.M. Castle & Co. Omnibus Incentive Plan, amended and restated as of July 27, 2016, for the benefit of officers, directors and other key management employees. In 2016, the Company's stockholders approved an increase in the number of shares available for grants of awards under the plan of 2,000 shares. As a result, there is an aggregate amount of 5,350 authorized shares under the plan.
Schedule of Nonvested Restricted Stock Units Activity
A summary of the non-vested share and RSU activity is as follows:
 
Non-Vested Shares
 
Restricted Share Units
 
Shares
 
Weighted-Average Grant
Date Fair Value
 
Units
 
Weighted-
Average Grant
Date Fair Value
Outstanding at January 1, 2016
170

 
$
10.08

 
210

 
$
5.91

Granted
304

 
$
1.47

 
—

 
$
—

Forfeited
(125
)
 
$
1.82

 
(48
)
 
$
6.88

Vested
(85
)
 
$
7.83

 
(21
)
 
$
14.35

Outstanding at December 31, 2016
264

 
$
2.40

 
141

 
$
4.31

Expected to vest at December 31, 2016
264

 
$
2.40

 
78

 
$
4.62
Summary of award information associated with market and non-market-based performance condition awards
The status of PSUs that were awarded as part of the 2014 LTCP is summarized below as of December 31, 2016:
Plan Year
Grant Date  Fair Value
 
Estimated Number of
Performance Shares  to be Issued
2014 LTCP
 
 
 
RTSR performance condition
$
20.16

 
—

ROIC performance condition
$
14.35

 
—
Schedule of Share Based Payment Award Performance Share Valuation Assumptions
The grant date fair value of PSU awards containing the RTSR performance condition was estimated using a Monte Carlo simulation with the following assumptions:
Expected volatility
40.8
%
Risk-free interest rate
0.79
%
Expected life (in years)
2.77

Expected dividend yield
—
Schedule of Share-based Compensation, Stock Options, Activity
A summary of stock option activity under all stock-based compensation plans is as follows:
 
Shares
 
Weighted
Average
Exercise Price
 
Intrinsic
Value
 
Weighted Average
Remaining
Contractual Life
Stock options outstanding at January 1, 2016
691

 
$
4.43

 
 
 
 
Granted
1,668

 
$
1.58

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Forfeited
(124
)
 
$
5.24

 
 
 
 
Expired
—

 
$
—

 
 
 
 
Stock options outstanding at December 31, 2016
2,235

 
$
2.26

 
$
—

 
9.1 years
Stock options exercisable at December 31, 2016
211

 
$
4.82

 
$
—

 
7.8 years
Stock options vested or expected to vest as of December 31, 2016
1,726

 
$
2.46

 
$
—

 
9.0 years
Short-term Incentive Plan - 2015 [Member] | Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average grant date fair value of $2.10 per share for the options granted under the 2015 STIP was estimated using the Black-Scholes option-pricing model with the following assumptions:
Expected volatility
56.1
%
Risk-free interest rate
1.8
%
Expected life (in years)
6.0

Expected dividend yield
—
Long-Term Compensation Plans 2016 and 2015 [Member] | Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average grant date fair values of $0.90 per share and $2.05 per share for options granted under the 2016 LTCP and 2015 LTCP, respectively, were estimated using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
2016
 
2015
Expected volatility
63.8
%
 
55.7
%
Risk-free interest rate
1.3
%
 
1.8
%
Expected life (in years)
6.0

 
5.8

Expected dividend yield
—

 
—