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Summary Of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Oct. 05, 2017
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
customer
segment
$ / shares
Dec. 31, 2016
USD ($)
customer
$ / shares
Dec. 31, 2015
USD ($)
customer
Jan. 01, 2018
USD ($)
Accounting Policies [Abstract]                          
Common stock split ratio (shares) 3                        
Common stock, par value (usd per share) | $ / shares $ 0.001 $ 0.001       $ 0.001       $ 0.001 $ 0.001    
Summary Of Significant Accounting Policies [Line Items]                          
Other-than-temporary impairment losses                   $ 0 $ 0 $ 0  
Depreciation expense                   $ 82,100,000 70,700,000 61,100,000  
Number of operating segments | segment                   1      
Impairment of goodwill                   $ 0      
System sales arrangement, free service period                   1 year      
System sales arrangement, additional period of service                   4 years      
Operating lease revenue                   $ 25,900,000 16,600,000 7,000,000  
Market-based implied volatility (period)                   1 year      
Market-based implied volatility (percent)                   100.00%      
Cash flow hedges de-designated (period)                   2 months      
Likelihood of tax benefits being realized upon ultimate settlement                   50.00%      
Total revenue   $ 892,400,000 $ 806,100,000 $ 756,200,000 $ 674,200,000 $ 756,900,000 $ 682,900,000 $ 670,100,000 $ 594,500,000 $ 3,128,900,000 2,704,400,000 2,384,400,000  
Service                   581,800,000 517,000,000 464,800,000  
Product                   2,547,100,000 2,187,400,000 1,919,600,000  
Operating expenses                   1,139,500,000 944,900,000 837,900,000  
Retained earnings   61,400,000       $ 1,574,900,000       61,400,000 1,574,900,000    
Excess tax benefits related to share-based compensation arrangements   $ 19,900,000 $ 19,700,000 $ 30,600,000 $ 32,600,000         $ 102,800,000 0 0  
Excess tax benefits related to share-based compensation arrangements, percent reduction                   9.40%      
Net cash provided by (used in) financing activities                   $ (1,913,100,000) 514,400,000 159,100,000  
Net cash provided by operating activities                   1,143,900,000 1,087,000,000 806,200,000  
ASU No. 2014-09                          
Summary Of Significant Accounting Policies [Line Items]                          
Product                   9,000,000 6,000,000    
ASU No. 2014-09 | Pro forma                          
Summary Of Significant Accounting Policies [Line Items]                          
Total revenue                   9,000,000 2,000,000    
Service                   (9,000,000) (6,000,000)    
Operating expenses                   $ (1,000,000) (2,000,000)    
ASU 2016-16                          
Summary Of Significant Accounting Policies [Line Items]                          
Deferred tax assets                         $ 390,000,000
ASU 2016-16 | Retained Earnings                          
Summary Of Significant Accounting Policies [Line Items]                          
Catch-up adjustment to retained earnings                         $ 390,000,000
ASU No. 2016-09                          
Summary Of Significant Accounting Policies [Line Items]                          
Net cash provided by (used in) financing activities                     (44,100,000) (34,300,000)  
Net cash provided by operating activities                     44,100,000 34,300,000  
Enterprise-wide software                          
Summary Of Significant Accounting Policies [Line Items]                          
Property, plant and equipment, estimated useful lives                   5 years      
Internal use software                          
Summary Of Significant Accounting Policies [Line Items]                          
Capitalized computer software, gross                   $ 22,400,000 $ 11,800,000 $ 14,800,000  
Minimum                          
Summary Of Significant Accounting Policies [Line Items]                          
Estimated useful life, intangible asset                   1 year      
Sales-type leases term                   24 months      
Maximum                          
Summary Of Significant Accounting Policies [Line Items]                          
Estimated useful life, intangible asset                   9 years      
Sales-type leases term                   84 months      
Derivative, term of contract                   12 months      
Maximum | Internal use software                          
Summary Of Significant Accounting Policies [Line Items]                          
Property, plant and equipment, estimated useful lives                   5 years      
United States                          
Summary Of Significant Accounting Policies [Line Items]                          
Long-lived assets, percent                   88.00% 86.00%    
Accounts Receivable | United States                          
Summary Of Significant Accounting Policies [Line Items]                          
Concentration risk, percentage                   69.00% 73.00%    
Total Revenue                          
Summary Of Significant Accounting Policies [Line Items]                          
Number of customers representing more than 10% of total revenue | customer                   0 0 0  
Total Revenue | United States                          
Summary Of Significant Accounting Policies [Line Items]                          
Concentration risk, percentage                   73.00% 72.00% 71.00%  
Total Revenue | International                          
Summary Of Significant Accounting Policies [Line Items]                          
Concentration risk, percentage                   27.00% 28.00% 29.00%