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Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2019
Significant Accounting Policies [Line Items]
Money Market Funds, at Carrying Value	$ 11,400,000
Capitalized Computer Software, Gross	1,600,000	$ 0
Restricted Cash and Cash Equivalents	$ 500,000	3,600,000
Period for inventory write-down	24 months
Depreciation	$ 26,900,000	28,000,000	$ 27,000,000
Goodwill, Impairment Loss	0	0	0
Income tax benefit	$ 2,974,000	4,440,000	3,375,000
Buildings | Minimum
Significant Accounting Policies [Line Items]
Useful lives	20 years
Buildings | Maximum
Significant Accounting Policies [Line Items]
Useful lives	40 years
Machinery and equipment | Minimum
Significant Accounting Policies [Line Items]
Useful lives	3 years
Machinery and equipment | Maximum
Significant Accounting Policies [Line Items]
Useful lives	10 years
Accounting Standards Update 2016-09
Significant Accounting Policies [Line Items]
Income tax benefit	$ 2,500,000	8,300,000
Accounting Standards Update 2016-16
Significant Accounting Policies [Line Items]
Cumulative effect of the adoption of ASU 2016-16 (Note 1)		6,230,000
Accounting Standards Update 2016-18
Significant Accounting Policies [Line Items]
Decrease in financing cash flows		2,500,000	1,500,000
Accounting Standards Update 2017-07
Significant Accounting Policies [Line Items]
Decrease in operating income	(4,100,000)	$ (3,800,000)
Increase operating income			$ (3,500,000)
Pro Forma | Accounting Standards Update 2016-02 | Minimum
Significant Accounting Policies [Line Items]
Operating Lease, Liability	52,000,000
Operating Lease, Right-of-Use Asset	10,000,000
Pro Forma | Accounting Standards Update 2016-02 | Maximum
Significant Accounting Policies [Line Items]
Operating Lease, Liability	58,000,000
Operating Lease, Right-of-Use Asset	$ 20,000,000
Subsequent Event | Accounting Standards Update 2018-02
Significant Accounting Policies [Line Items]
Increase in Retained Earnings				$ 4,000,000
Americas | Minimum
Significant Accounting Policies [Line Items]
Sales Through Distributors	75.00%
Americas | Maximum
Significant Accounting Policies [Line Items]
Sales Through Distributors	85.00%
International | Minimum
Significant Accounting Policies [Line Items]
Sales Through Distributors	55.00%
International | Maximum
Significant Accounting Policies [Line Items]
Sales Through Distributors	65.00%

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