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Shareholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 03, 2020 | Jul. 25, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate ordinary shares repurchase | $ 9,187,800 |  |  |  |
Shares repurchase, shares | 11,200,000 | 10,300,000 | 9,500,000 |  |
Shares repurchase, value | $ 1,278,000,000.0 | $ 1,103,900,000 | $ 995,300,000 |  |
Weighted average fair value granted under options | $ 22.81 | $ 30.14 | $ 25.00 |  |
Total intrinsic value of options exercised | $ 25,400,000 | $ 297,500,000 | $ 95,700,000 |  |
Weighted average fair value of stock units granted | $ 113.3 | $ 101.2 | $ 103.5 |  |
Total fair value of restricted stock units vested | $ 47,000.0 | $ 32,300 | $ 35,800 |  |
Unrecognized compensation expense | $ 214,000,000.0 |  |  |  |
Unrecognized compensation expense expected period of recognition (in years) | 1 year 11 months 1 day |  |  |  |
Options to purchase ordinary shares reserved for issuance | 15,800 |  |  |  |
Share based compensation aggregate amount including options and units aggregate value outstanding | $ 157,600,000 |  |  |  |
Share based compensation arrangement by share based payment award options outstanding intrinsic value | $ 122,400,000 | $ 101,200,000 |  |  |
Options In The Money |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation arrangement by share based payment award options nonvested number of shares | 4,900,000 | 5,200,000 |  |  |
Options Out Of Money |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation arrangement by share based payment award options nonvested number of shares | 5,800,000 | 3,400,000 |  |  |
Share based compensation arrangement by share based payment award options outstanding intrinsic value | $ 0 | $ 0 |  |  |
Share Repurchase Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized amount under share repurchase programs per quarter |  |  |  | $ 2,000,000 | $ 2,000,000
Authorized amount under share repurchase programs |  |  |  | $ 325,000 | $ 325,000
Two Thousand Five Equity Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum period options granted to employees, officers and directors (in years) | 7 years |  |  |  |
Reserved and Authorized Shares, percent of ordinary shares issued and outstanding at year end | 10.00% |  |  |  |
Employee Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Ordinary shares issued | 1,200,000 |  |  |  |
Percentage of salary to purchase Ordinary shares |  | 15.00% |  |  |
Ordinary shares per employee, maximum |  | 1,250 |  |  |
Price of Ordinary shares purchased under ESPP, percentage of lower of fair market value of Ordinary share on subscription date of each offering period or on purchase date |  | 85.00% |  |  |
Purchase of Ordinary shares by employees | 300,000 | 300,000 | 300,000 |  |
Average price per share purchased by employees | $ 95.15 | $ 87.58 | $ 73.47 |  |
Compensation expense recognized | $ 8,000.0 | $ 6,700 | $ 6,700 |  |
US ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options to purchase ordinary shares reserved for issuance | 500,000 |  |  |  |
Number of shares available under ESPP | 800,000 |  |  |  |
Rest of the World ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options to purchase ordinary shares reserved for issuance | 1,000,000.0 |  |  |  |
Stock Options | Two Thousand Five Equity Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation arrangement by share based payment award equity instruments other than options non vested number | 1,400 | 1,300 |  |  |
Restricted Stock Units (RSUs) | Two Thousand Five Equity Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
CHKP Performance Stock Units Psu [Member] | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation arrangement by share based payment award equity instruments other than options non vested number | 100 |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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