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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) Segment shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Jan. 01, 2019 USD ($) | Jan. 01, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating segments | Segment | 1 |  |  |  |
Goodwill impairment losses | $ 0 | $ 0 | $ 0 |  |
Deferred revenue | 1,386,700,000 | 1,338,000,000.0 |  |  |
Revenue expected to be recognized from remaining performance obligations | 1,560,300 | 1,557,600 |  |  |
Revenue expected to be recognized from remaining performance obligations, 2019 | 1,087,300 |  |  |  |
Provision for estimated sales returns, rebates, stock rotations, and other customer rights | $ 4,600,000 | 8,500,000 |  |  |
Maximum percentage of annual compensation contributed by employees towards employee benefit plan | 50.00% |  |  |  |
Maximum amount contributed by employees toward employee benefit plan | $ 19,000 |  |  |  |
Additional amount contributed by employees aged 50 and over towards employee benefit plan | $ 6,000 |  |  |  |
Percentage of employee contributions contributed by employer towards employee benefit plan | 50.00% |  |  |  |
Maximum percentage of employee's eligible compensation | 6.00% |  |  |  |
Contributions by employer | $ 4,100,000 | 4,200,000 | 3,600,000 |  |
Minimum percentage of tax benefit realized upon settlement | 50.00% |  |  |  |
Advertising expenses | $ 5,200,000 | 3,100,000 | $ 1,800,000 |  |
Allowance for doubtful accounts | $ 800,000 | $ 1,000,000.0 |  |  |
Anti-dilutive shares excluded from computation of earnings per share amount | shares | 4,900,000 | 3,200,000 | 1,600,000 |  |
Operating lease ROU assets | $ 28,900,000 |  |  |  |
Lease liabilities |  | $ 29,200,000 |  |  |
Rent expenses | 11,100,000 | 8,200,000 | $ 11,100,000 |  |
Manufacturing partner and supplier liabilities |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Significant costs associated with exposure | 0 | 0 |  |  |
Other Long Term Assets |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred commission | 20,200,000 | 22,600,000 |  |  |
Amortisation of contracted capitalised costs | 13,100,000 | 11,200,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease ROU assets |  |  |  | $ 27,700,000 |
Lease liabilities |  |  |  | $ 27,700,000 |
Accounting Standards Update 2016-09 | Retained earnings | Forfeitures |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings |  |  |  |  | $ 2,100,000
Accounting Standards Update 2016-09 | Retained earnings | Income Tax Accounting |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings |  |  |  |  | $ 86,100,000
Security Subscriptions and Software Updates and Maintenance |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue | 1,069,900,000 | 878,500 |  |  |
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, notional amount | 342,300,000 | 337,500,000 |  |  |
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, notional amount | 38,200,000 | 112,100,000 |  |  |
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, net gain (loss) | 16,700,000 | (33,300,000) | 25,100,000 |  |
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative, net gain (loss) | $ 1,300,000 | $ (4,600,000) | $ 4,700,000 |  |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives of intangible assets | 8 years |  |  |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives of intangible assets | 20 years |  |  |  |

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