Leases - Schedule of Capital Item (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital Leased Assets [Line Items]      
Depreciation Expense $ 4,904 $ 4,776 $ 1,081
Buildings [Member] | Georgetown Facility [Member]      
Capital Leased Assets [Line Items]      
Cost 4,881 4,844  
Accumulated Depreciation 512 127  
Depreciation Expense 385 158  
Interest Expense 670 468  
Land, Buildings and Improvements [Member] | Winona Facility [Member]      
Capital Leased Assets [Line Items]      
Cost 1,700 1,700  
Accumulated Depreciation 424 367  
Depreciation Expense 57 56  
Other Property Plant And Equipment [Member]      
Capital Leased Assets [Line Items]      
Cost 1,166 2,240  
Accumulated Depreciation   87  
Depreciation Expense   19  
Interest Expense 33 71  
Property, Plant or Equipment Capital Lease [Member]      
Capital Leased Assets [Line Items]      
Cost 7,747 8,784  
Accumulated Depreciation 936 581  
Depreciation Expense 442 233  
Interest Expense $ 703 $ 539