Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Contingency [Line Items]
Pretax income	$ 10,141,000	$ 11,784,000	$ 20,427,000	$ 30,193,000
Income tax expense (benefit)	3,614,000	$ 3,141,000	8,775,000	$ 10,654,000
Pension, restructuring and other non recurring costs			10,200,000
Offsetting of income tax			5,000,000.0
Decrease in valuation allowance			(6,200,000)
Gross unrecognized tax benefits	34,700,000		34,700,000		$ 30,500,000
Unrecognized tax benefits that would impact effective tax rate	23,900,000		23,900,000
Minimum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	0		0
Maximum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	$ 7,000,000.0		7,000,000.0
Pension, Restructuring, and Other Non-Recurring Costs [Member]
Income Tax Contingency [Line Items]
Income tax expense (benefit)			$ 0