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Nature of Operations and Summary of Significant Accounting Policies (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 07, 2013
segment
Jan. 03, 2012
subsidiary
Jun. 30, 2015
USD ($)
Jun. 30, 2010
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
segment
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2001
USD ($)
Sep. 30, 2015
Mar. 31, 2014
Accounting Policies [Line Items]                      
Number of subsidiaries distributed to company | subsidiary   3                  
Number of reportable segments | segment 3       2 2          
Proceeds from grantors (in dollars)                 $ 26,000    
USDA grant         $ 1,949 $ 2,486          
Deferred credit balance         1,042 1,125          
Lawrenceburg reimbursement         411 488          
Shipping and handling revenue (in dollars)         17,652 14,061 $ 12,292        
Research and development expense (in dollars)         748 1,622 2,472        
Debt instrument, fair value disclosure (in dollars)         34,603 10,297          
Long-term debt, less current maturities         7,579 7,286          
Pension Benefit Plan [Member]                      
Accounting Policies [Line Items]                      
Benefit obligations         0 2,016 $ 2,190 $ 2,690      
Employer contributions     $ 741   741 0          
Short And Long-term Debt [Member]                      
Accounting Policies [Line Items]                      
Long-term debt, less current maturities         $ 34,096 10,283          
Reimbursment [Member]                      
Accounting Policies [Line Items]                      
Proceeds from grantors (in dollars)               $ 1,250      
Reimbursment of Maintenance Costs [Member]                      
Accounting Policies [Line Items]                      
Deferred revenue and credits (in dollars)           1,236          
Reimbursement of System Control Costs [Member]                      
Accounting Policies [Line Items]                      
Deferred revenue and credits (in dollars)           $ 488          
Minimum [Member] | Building and Improvements [Member]                      
Accounting Policies [Line Items]                      
Useful life         20 years            
Minimum [Member] | Transportation Equipment Assets [Member]                      
Accounting Policies [Line Items]                      
Useful life         5 years            
Minimum [Member] | Machinery Equipment [Member]                      
Accounting Policies [Line Items]                      
Useful life         10 years            
Maximum [Member] | Building and Improvements [Member]                      
Accounting Policies [Line Items]                      
Useful life         40 years            
Maximum [Member] | Transportation Equipment Assets [Member]                      
Accounting Policies [Line Items]                      
Useful life         6 years            
Maximum [Member] | Machinery Equipment [Member]                      
Accounting Policies [Line Items]                      
Useful life         12 years            
ICP [Member]                      
Accounting Policies [Line Items]                      
Equity method ownership percentage (percent)         30.00%         30.00% 30.00%
Ownership percentage sold (percent)       50.00%       20.00%