Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Net deferred tax asset	$ 28,571	$ 24,134
Valuation allowance	(12,546)	(13,118)
Alternative minimum tax credit carryforward	800
Undistributed earnings	41,200
Cash held by foreign subsidiaries	34,800
Unrecognized tax benefits liability	628	489	$ 27	$ 189
Accrued interest and penalties are included in the unrecognized tax benefits	200	$ 100
Interest and penalties estimated to be released in 12 months	$ 200
Minimum
Income Tax Disclosure [Line Items]
Federal research and development tax credit carryforward expiration year	2028
Maximum
Income Tax Disclosure [Line Items]
Federal research and development tax credit carryforward expiration year	2035
Research And Development
Income Tax Disclosure [Line Items]
Tax credits carried forward	$ 1,500
China and India
Income Tax Disclosure [Line Items]
Release of valuation allowance	3,100
United Kingdom
Income Tax Disclosure [Line Items]
Release of valuation allowance	1,300
Belgium and Luxemburg
Income Tax Disclosure [Line Items]
Valuation allowance	(2,600)
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	61,900
Domestic Tax Authority
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	14,500
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Valuation allowance	(300)
Net operating loss carryforwards	$ 61,600