Other Intangible Assets (Schedule of Intangible Asset by Class) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Finite-Lived Intangible Assets and Indefinite-lived intangible assets [Line Items]
Gross Amount	$ 87,149	$ 64,742
Accumulated Amortization	67,863	64,716
Net	19,286	26
2019	4,516
Finite-Lived Intangible Assets, Amortization Expense, Year Two	4,516
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,631
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,136
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1,075
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	5,412
Customer relationships
Schedule of Finite-Lived Intangible Assets and Indefinite-lived intangible assets [Line Items]
Gross Amount	41,198	30,993
Accumulated Amortization	32,764	30,993
Net	8,434	0
Developed technology
Schedule of Finite-Lived Intangible Assets and Indefinite-lived intangible assets [Line Items]
Gross Amount	30,031	24,446
Accumulated Amortization	25,545	24,446
Net	4,486	0
Patents, trademarks and tradenames
Schedule of Finite-Lived Intangible Assets and Indefinite-lived intangible assets [Line Items]
Gross Amount	10,477	3,765
Accumulated Amortization	4,111	3,765
Net	6,366	0
Service contracts
Schedule of Finite-Lived Intangible Assets and Indefinite-lived intangible assets [Line Items]
Gross Amount	5,443	5,538
Accumulated Amortization	5,443	5,512
Net	$ 0	$ 26