Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2017
Unrecognized Tax Benefits Summary [Line Items]
Valuation allowance	$ 6,300,000
Statutory rate	21.00%	21.00%	35.00%
Income tax effects provisional amount				$ 16,600,000
Income tax effects adjustment to provisional amounts		$ 3,900,000
Operating Loss Carryforwards	$ 12,200,000
Tax credit carryforward, amount	26,000,000
Unremitted earnings of foreign subsidiaries	227,000,000
Unrecognized tax benefits that would favorably impact effective tax rate	2,600,000
Unrecognized tax benefits, income tax penalties and interest accrued	3,900,000	$ 3,300,000	$ 2,400,000	$ 2,400,000
Decrease in unrecognized tax benefits in next twelve months	$ 0
Earliest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2020
State tax credit carryforwards, expiration year	2021
Open tax year	2014
Earliest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2015
Earliest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2017
Latest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2038
State tax credit carryforwards, expiration year	2026
Open tax year	2018
Latest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2017
Latest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2018