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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
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%