Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Federal income tax rate	35.00%	35.00%	35.00%
Valuation allowances	$ 4,066,000	$ 3,773,000
Research and development, tax credit	1,100,000	1,500,000	$ 1,800,000
Investment tax credits	2,200,000
Unremitted earnings, reinvested	399,900,000	338,600,000
Deferred tax liability	0
Gross unrecognized tax benefits	14,200,000	$ 12,200,000	$ 14,900,000	$ 14,900,000
Unrecognized tax benefits that would impact effective tax rate	11,300,000
Minimum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	0
Maximum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	900,000
United States - Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 15,500,000
Net operating loss carryforwards expiration year	2036
Tax credit carryforwards	$ 2,900,000
Tax credit carryforwards expiration year	2035
United States - State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 77,800,000
Tax credit carryforwards	$ 200,000
Tax credit carryforwards expiration year	2017
United States - State [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration year	2017
United States - State [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration year	2036
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 4,800,000
Net operating loss carryforwards expiration year	2019
Tax credit carryforwards	$ 800,000
Tax credit carryforwards expiration year	2030