Cost-Reduction Actions - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,600,000	$ 0
Charges related to work-force reductions	(900,000)
Expense (benefit) for changes in estimates		(2,900,000)
Cost of Revenue | Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,700,000)	(3,000,000)
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,000,000	100,000
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,300,000
Lease abandonment and asset write-offs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort		$ 3,500,000