Cost-Reduction Actions - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,600,000		$ 5,200,000	$ 0
Charges related to work-force reductions	1,800,000		900,000
Expense (benefit) for changes in estimates		$ 700,000		(2,200,000)
Cost of revenue | Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(1,000,000)	(500,000)	(4,700,000)	(3,500,000)
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,600,000	$ 1,200,000	8,600,000	$ 1,300,000
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,300,000
Lease abandonment costs and asset write-offs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort	$ 800,000		$ 4,300,000