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Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Acquired Intangible Assets by Major Class [Line Items]    
Gross Carrying Amount $ 60,340 $ 60,340
Accumulated Amortization (45,409) (43,028)
Net Amount 14,931 17,312
Trademarks $ 300 300
Licenses    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives 2120 days  
Gross Carrying Amount $ 20,130 20,130
Accumulated Amortization (19,694) (19,383)
Net Amount $ 436 747
Product lines    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives 3781 days  
Gross Carrying Amount $ 33,858 33,858
Accumulated Amortization (19,363) (17,293)
Net Amount $ 14,495 16,565
Customer relationships    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives 1788 days  
Gross Carrying Amount $ 3,152 3,152
Accumulated Amortization (3,152) (3,152)
Net Amount $ 0 0
Trade names    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives 1825 days  
Gross Carrying Amount $ 3,000 3,000
Accumulated Amortization (3,000) (3,000)
Net Amount $ 0 0
Non-compete agreements    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives 1825 days  
Gross Carrying Amount $ 200 200
Accumulated Amortization (200) (200)
Net Amount $ 0 $ 0