Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Income tax benefit from new interpretation of tax law		$ 600
Long-term net deferred tax assets	$ 9,800	13,100
Long-term net deferred tax liabilities	100	200
Valuation allowance	$ 2,193	1,534	$ 1,565	$ 2,200
Operating loss carryforwards, expired	2020
Operating loss carryforwards related to a prior acquisition	$ 3,500
U.S. federal and state capital loss carryforwards	3,400
Deferred tax assets, Capital loss carryforwards expires in 2018	400
Deferred tax assets, Capital loss carryforwards expires in 2020	1,600
Deferred tax assets, Capital loss carryforwards expires in 2021	1,400
Net tax deficiencies from tax deductions less than book deductions resulting from employee stock option exercises	100	200
Undistributed earnings of company's foreign subsidiaries	27,800
Unrecognized tax benefits	1,774	1,910	2,136	$ 2,012
Unrecognized tax benefits will be recognized within next twelve months	1,100
Accrued interest and penalties related to uncertain tax positions	100	$ 200	$ 200
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	700
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 20,400