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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jan. 23, 2019 $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Customer IncentivePlan | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) | Feb. 21, 2019 USD ($) | Jan. 01, 2019 | Jan. 01, 2018 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2008 USD ($) | Jan. 13, 1995 USD ($)
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash, uninsured amount |  |  |  | $ 102,200,000 |  |  |  |  |  |  |  |
Bonds payable, carrying amount |  |  |  | 25,600,000 |  |  |  |  |  |  | $ 50,000,000.0 | $ 20,000,000.0
Bonds payable, fair value |  |  |  | $ 25,400,000 |  |  |  |  |  |  |  |
Number of single customer comprising more than 10% of account receivable | Customer |  |  |  | 3 | 2 |  |  |  |  |  |  |
Allowance for doubtful accounts |  |  | $ 0 | $ 128,000 | $ 0 |  |  |  |  |  |  |
Impairment losses recognized on long-lived assets or intangible assets |  |  |  | 0 | 0 | $ 0 |  |  |  |  |  |
Impairment losses recognized on goodwill |  |  |  | $ 0 | 0 | 0 |  |  |  |  |  |
Period of warranty for product defects |  |  |  | 90 days to five years |  |  |  |  |  |  |  |
Liability for warranty obligations |  |  | 9,724,000 | $ 8,623,000 | 9,724,000 | 8,548,000 |  |  |  | $ 8,739,000 |  |
Pension liability |  |  | 8,269,000 | $ 13,078,000 | 8,269,000 |  |  |  |  |  |  |
Number of stock incentive plans | IncentivePlan |  |  |  | 2 |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 7,155,000 | 7,433,000 | 6,695,000 |  |  |  |  |  |
Total compensation cost related to non-vested stock options, market-based PSUs, RSUs and restricted stock not yet recognized |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |
Recognition period of unvested compensation expense |  |  |  | 2 years 10 months 24 days |  |  |  |  |  |  |  |
Research and development costs |  |  |  | $ 124,547,000 | 130,666,000 | 124,909,000 |  |  |  |  |  |
Tax cuts and jobs act, incomplete accounting, estimated income tax expense |  |  | 11,900,000 |  |  |  |  |  |  |  |  |
Tax cuts and jobs act, incomplete accounting, estimated write-down of deferred tax assets |  |  | 9,200,000 |  |  |  |  |  |  |  |  |
Tax cuts and jobs act, incomplete accounting, change in tax rate estimate income tax expense related to unrepatriated foreign earnings |  |  | 2,700,000 |  |  |  |  |  |  |  |  |
Tax cuts and jobs act, complete accounting, income tax expense (benefit) |  | $ (4,000,000.0) |  |  |  |  |  |  |  |  |  |
Dividend payments |  |  |  | 17,300,000 | 17,400,000 | 17,600,000 |  |  |  |  |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends per share declared | $ / shares | $ 0.09 |  |  |  |  |  |  |  |  |  |  |
Dividend declaration date | Jan. 23, 2019 |  |  |  |  |  |  |  |  |  |  |
Dividend record date | Feb. 07, 2019 |  |  |  |  |  |  |  |  |  |  |
Dividend payment date | Feb. 21, 2019 |  |  |  |  |  |  |  |  |  |  |
Ex-dividend date | Feb. 06, 2019 |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend payable subsequent to balance sheet date |  |  |  |  |  |  | $ 4,300,000 |  |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current deferred costs related to prepaid and other assets |  |  | 11,400,000 | 2,400,000 | 11,400,000 |  |  |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-current deferred costs related to other assets |  |  | $ 2,800,000 | 800,000 | 2,800,000 |  |  |  |  |  |  |
ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net unrealized gains from accumulated other comprehensive income to opening retained earnings |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |
ASU 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassified from cost of sales, selling, general and administrative expenses, and research and development expense to other income (expense), net |  |  |  |  | 400,000 | $ 200,000 |  |  |  |  |  |
2017 Performance-Based PSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | 0 | $ 0 |  |  |  |  |  |  |
Unrecognized compensation expense related to other than options |  |  |  | $ 9,100,000 |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  |  | 2 years |  |  |  |  |  |  |  |
Maintenance contract period |  |  |  | 1 month |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  |  | 14 years |  |  |  |  |  |  |  |
Maintenance contract period |  |  |  | 5 years |  |  |  |  |  |  |  |
Maximum [Member] | Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset as percentage on total assets |  |  |  |  |  |  |  | 3.00% |  |  |  |
Operating lease, right-of-use asset as percentage on total assets |  |  |  |  |  |  |  | 3.00% |  |  |  |
Maximum [Member] | Accounting Policy under Topic 605 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invoiced sales tax as percentage on total revenues. |  |  |  | 1.00% |  |  |  |  |  |  |  |
Building and Land Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 5 years |  |  |  |  |  |  |  |
Building and Land Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 39 years |  |  |  |  |  |  |  |
Office Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |  |  |  |  |  |
Office Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 7 years |  |  |  |  |  |  |  |
Engineering Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |  |  |  |  |  |
Engineering Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 7 years |  |  |  |  |  |  |  |
Computer Software [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 3 years |  |  |  |  |  |  |  |
Computer Software [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 5 years |  |  |  |  |  |  |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of accounts receivable accounted by each customers |  |  |  | 45.80% | 63.80% |  |  |  |  |  |  |

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