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Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 502,181 [1],[2] $ 498,231
Accumulated Amortization (387,578) [1] (367,531)
Foreign Currency Translation Adjustment (5,109) (5,218)
Net Carrying Amount 109,494 125,482
Developed technology    
Finite-Lived Intangible Assets    
Gross Carrying Amount 337,198 [1],[2] 336,308
Accumulated Amortization (265,951) [1] (252,080)
Foreign Currency Translation Adjustment (4,035) (4,079)
Net Carrying Amount 67,212 80,149
Customer Relationships    
Finite-Lived Intangible Assets    
Gross Carrying Amount 100,313 [1],[2] 97,153
Accumulated Amortization (87,496) [1] (83,448)
Foreign Currency Translation Adjustment (285) (340)
Net Carrying Amount 12,532 13,365
Trademarks and tradenames    
Finite-Lived Intangible Assets    
Gross Carrying Amount 64,670 [1],[2] 64,420
Accumulated Amortization (34,131) [1] (31,653)
Foreign Currency Translation Adjustment (789) (799)
Net Carrying Amount $ 29,750 31,968
Non-compete Agreements    
Finite-Lived Intangible Assets    
Gross Carrying Amount   320
Accumulated Amortization   (320)
Backlog    
Finite-Lived Intangible Assets    
Gross Carrying Amount   30
Accumulated Amortization   $ (30)
[1] $0.7 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[2] Includes $4.6 million of intangible assets from Lemsys acquisition.