Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Net operating loss carry-forwards			$ 300
Operating loss carryforwards, expiration date			2025
Tax credit carry-forwards			$ 4,300
Tax credit carry-forwards deferred tax asset			3,408	$ 4,027
Tax credit carry-forwards, valuation allowance			2,200
Undistributed earnings and profits			$ 52,200
Provisional estimate of one-time deemed repatriation transition tax	$ 3,300	$ 300
Deferred tax asset provisional write-down income tax expense benefit	700
Tax benefit from remeasurement of deferred tax assets and liabilities	1,200				$ 500
Effective income tax rate from remeasurement of deferred tax assets and liabilities			21.00%	21.00%	21.00%	35.00%
Unrecognized tax benefits	$ 7,419	$ 7,113	$ 12,804	$ 11,239	$ 7,113	$ 7,419
Unrecognized tax benefits which, if recognized, would affect the effective tax rate			11,900	10,200
Accrued interest and penalties recognized related to unrecognized tax benefits			400	500	$ 500
Accrued interest and penalties			2,000	$ 1,700
Reasonably possible amount of decrease in unrecognized tax benefit over the next twelve months			$ 3,900
Earliest Tax Year
Income Taxes [Line Items]
Tax credit carry-forwards, expiration dates			2021
Latest Tax Year
Income Taxes [Line Items]
Tax credit carry-forwards, expiration dates			2030
NOL expires in 2025
Income Taxes [Line Items]
Net operating loss carry-forwards			$ 200