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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 16, 2016
Jun. 02, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases Disclosure [Line Items]          
Gross proceeds from sale and leaseback agreement     $ 14,244    
Sublease agreement period   5 years      
Weighted average effective interest rate of sale leaseback financing liability   2.22%      
Gain on sale of facility $ 2,000 $ 2,400      
Capital lease obligations $ 3,000 $ 5,700      
Capital lease weighted average interest rate 3.25% 3.43%      
Rent expense     4,500 $ 4,000 $ 2,900
Denton, Texas Facility [Member]          
Leases Disclosure [Line Items]          
Gross proceeds from sale and leaseback agreement   $ 5,000      
Sale leaseback transaction costs   300      
Net proceeds from sale and leaseback agreement   $ 4,700      
Lease agreement period   13 years      
Sale leaseback transaction, net carrying value     $ 12,300 $ 13,100  
Telford, Pennsylvania Facility [Member]          
Leases Disclosure [Line Items]          
Gross proceeds from sale and leaseback agreement   $ 6,000      
Sale leaseback transaction costs   400      
Net proceeds from sale and leaseback agreement   $ 5,600      
Lease agreement period   13 years      
Indianapolis, Indiana Facility [Member]          
Leases Disclosure [Line Items]          
Gross proceeds from sale and leaseback agreement $ 3,300        
Sale leaseback transaction costs 100        
Net proceeds from sale and leaseback agreement $ 3,200        
Lease agreement period 13 years