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Summary Of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |
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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% |

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