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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended | 77 Months Ended |  |  |  |  |
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Jan. 16, 2018 $ / shares | Dec. 31, 2017 USD ($) IncentivePlan | Dec. 31, 2017 USD ($) Customer IncentivePlan | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2017 USD ($) IncentivePlan | Feb. 14, 2018 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2008 USD ($) | Jan. 13, 1995 USD ($)
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash, uninsured amount |  | $ 83,700,000 | $ 83,700,000 |  |  | $ 83,700,000 |  |  |  |  |
Bonds payable, carrying amount |  | 26,700,000 | 26,700,000 |  |  | 26,700,000 |  |  |  | $ 50,000,000 | $ 20,000,000
Bonds payable, fair value |  | 26,700,000 | $ 26,700,000 |  |  | 26,700,000 |  |  |  |  |
Number of single customer comprising more than 10% of revenue | Customer |  |  | 2 | 3 | 3 |  |  |  |  |  |
Allowance for doubtful accounts |  | 0 | $ 0 | $ 0 |  | 0 |  |  |  |  |
Period of warranty for product defects |  |  | 90 days to five years |  |  |  |  |  |  |  |
Liability for warranty obligations |  | $ 9,724,000 | $ 9,724,000 | 8,548,000 | $ 8,739,000 | $ 9,724,000 |  |  | $ 8,415,000 |  |
Number of stock incentive plans | IncentivePlan |  | 2 | 2 |  |  | 2 |  |  |  |  |
Stock-based compensation expense |  |  | $ 7,433,000 | 6,695,000 | 6,712,000 |  |  |  |  |  |
Total compensation cost related to non-vested stock options, market-based PSUs, RSUs and restricted stock not yet recognized |  | $ 17,100,000 | $ 17,100,000 |  |  | $ 17,100,000 |  |  |  |  |
Recognition period of unvested compensation expense |  |  | 2 years 10 months 24 days |  |  |  |  |  |  |  |
Impairment losses recognized on long-lived assets |  |  | $ 0 | 0 | 0 |  |  |  |  |  |
Impairment losses recognized on goodwill and other intangible assets |  |  |  |  |  | 0 |  |  |  |  |
Research and development costs |  |  | $ 130,434,000 | 124,804,000 | 129,876,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Percentage of sales taxes collected from customers |  |  | 1.00% |  |  |  |  |  |  |  |
Dividend payments |  |  | $ 17,400,000 | 17,600,000 | $ 18,400,000 |  |  |  |  |  |
Retained earnings |  | 922,178,000 | 922,178,000 | 921,942,000 |  | 922,178,000 |  |  |  |  |
ASU 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in additional paid in capital |  |  |  |  |  |  |  | $ 100,000 |  |  |
Retained earnings |  |  |  |  |  |  |  | 100,000 |  |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock dividends per share declared | $ / shares | $ 0.09 |  |  |  |  |  |  |  |  |  |
Dividend declaration date | Jan. 16, 2018 |  |  |  |  |  |  |  |  |  |
Dividend record date | Jan. 31, 2018 |  |  |  |  |  |  |  |  |  |
Dividend payment date | Feb. 14, 2018 |  |  |  |  |  |  |  |  |  |
Ex-dividend date | Jan. 30, 2018 |  |  |  |  |  |  |  |  |  |
Quarterly dividend payable subsequent to balance sheet date |  |  |  |  |  |  | $ 4,400,000 |  |  |  |
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 | 11,400,000 | 10,700,000 |  | 11,400,000 |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-current deferred costs related to other assets |  | 2,800,000 | 2,800,000 | $ 900,000 |  | 2,800,000 |  |  |  |  |
Performance-Based PSUs [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 0 |  |  |  |  |  |  |  |
Recognition period of unvested compensation expense |  |  | 3 years |  |  |  |  |  |  |  |
Unrecognized compensation expense related to other than options |  | $ 11,400,000 | $ 11,400,000 |  |  | $ 11,400,000 |  |  |  |  |
Non-qualified Stock Options and RSUs [Member] | ASU 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in deferred tax assets |  |  |  |  |  |  |  | $ 10,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  | 9 months |  |  |  |  |  |  |  |
Maintenance contract period |  |  | 1 year |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization, estimated useful lives |  |  | 14 years |  |  |  |  |  |  |  |
Maintenance contract period |  |  | 5 years |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of accounts receivable accounted by each customers |  |  | 63.80% | 63.30% |  |  |  |  |  |  |

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