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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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