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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2020 USD ($) Segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment | 1 |  |  |
Goodwill impairment losses | $ 0 | $ 0 | $ 0 |
Deferred revenue | 1,481,900,000 | 1,386,700,000 |  |
Revenue expected to be recognized from remaining performance obligations | 1,679.8 | 1,560.3 |  |
Revenue expected to be recognized from remaining performance obligations, 2019 | 1,190.6 |  |  |
Provision for estimated sales returns, rebates, stock rotations, and other customer rights | $ 6,900,000 | 4,600,000 |  |
Percentage of employee contributions contributed by employer towards employee benefit plan | 50.00% |  |  |
Maximum percentage of employee's eligible compensation | 6.00% |  |  |
Minimum percentage of tax benefit realized upon settlement | 50.00% |  |  |
Advertising expenses | $ 3,700,000 | $ 5,200,000 | $ 3,100,000 |
Anti-dilutive shares excluded from computation of earnings per share amount | shares | 6,200,000 | 4,900,000 | 3,200,000 |
Trade receivables, net | $ 540,800,000 | $ 495,800,000 |  |
Right of use assets | 29,700,000 |  |  | $ 27,700,000
Lease liabilities | $ 30,700,000 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other Accrued Liabilities, Current |  |  |
Rent expenses | $ 13,100,000 | 11,100,000 | $ 8,200,000 |
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 | 18,100,000 | 20,200,000 |  |
Amortisation of contracted capitalised costs | 15,300,000 | 13,100,000 | 11,200,000 |
Accounting Standards Update 2016-02 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Lease liabilities |  |  |  | $ 27,700,000
Security Subscriptions and Software Updates and Maintenance |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue | 1,011,900,000 | 980,200 |  |
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, notional amount | 396,200,000 | 342,300,000 |  |
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, notional amount | 37,700,000 | 38,200,000 |  |
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, net gain (loss) | 24,800,000 | 16,700,000 | (33,300,000) |
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, net gain (loss) | $ 5,900,000 | $ 1,300,000 | $ (4,600,000) |
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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