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Reorganization - Schedule of Rolls Forward of Activity in Reorganization Accrual (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost And Reserve [Line Items]      
Accrual Beginning Balance $ 481 $ 118  
Additions 1,026 4,433 $ 1,817
Cash payments (1,507) (3,595)  
Non-cash charge   (475)  
Accrual Ending Balance   481 118
Workforce Reduction [Member]      
Restructuring Cost And Reserve [Line Items]      
Accrual Beginning Balance 41 118  
Additions 1,022 3,173  
Cash payments (1,063) (3,250)  
Accrual Ending Balance   41 $ 118
Subsidiary Liquidation [Member]      
Restructuring Cost And Reserve [Line Items]      
Accrual Beginning Balance 7    
Additions   334  
Cash payments (7) (9)  
Non-cash charge   (318)  
Accrual Ending Balance   7  
Products Group Reorganization [Member]      
Restructuring Cost And Reserve [Line Items]      
Accrual Beginning Balance 433    
Additions 4 926  
Cash payments $ (437) (336)  
Non-cash charge   (157)  
Accrual Ending Balance   $ 433