Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 85,352	$ 85,478
Accumulated Amortization	(82,563)	(81,017)
Total future amortization expense	$ 2,789	4,461
Developed Core Technology
Finite-Lived Intangible Assets [Line Items]
Useful Life	3 months 18 days
Gross Carrying Amount	$ 31,707	31,707
Accumulated Amortization	(31,642)	(30,757)
Total future amortization expense	$ 65	950
Customer relationships/contracts
Finite-Lived Intangible Assets [Line Items]
Useful Life	10 months 24 days
Gross Carrying Amount	$ 44,497	44,577
Accumulated Amortization	(41,773)	(41,092)
Total future amortization expense	2,724	3,485
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	594	609
Accumulated Amortization	(594)	(583)
Total future amortization expense	0	26
Maintenance Agreements and Related Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,500	5,500
Accumulated Amortization	(5,500)	(5,500)
Total future amortization expense	0	0
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,054	3,085
Accumulated Amortization	(3,054)	(3,085)
Total future amortization expense	$ 0	$ 0