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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 03, 2020 | Feb. 13, 2020 | Mar. 05, 2019 | Feb. 13, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 7,144,000 |  |
Share-based compensation expense |  |  |  |  | $ 44,697,000 | $ 34,049,000 | $ 28,885,000
Omnicell Plan | Other Postretirement Benefit Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Employer matching contribution, percent of employee contribution |  |  |  |  | 50.00% |  |
Maximum amount of employer contribution |  |  |  |  | $ 3,000 |  |
401(k) contributions |  |  |  |  | $ 5,700,000 | 5,100,000 | 4,600,000
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 3,932,000 |  |
Tax benefit realized from stock options exercised |  |  |  |  | $ (7,100,000) | $ (6,300,000) | (3,600,000)
ESPP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 1,206,000 |  |
PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Trading days used for stock price appreciation calculation |  | 20 days |  | 20 days |  |  |
PSUs | Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards granted (in shares) |  |  |  |  | 62,759 | 61,098 |
1997 Plan | ESPP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum percentage of earnings allowed for purchase of shares |  |  |  |  | 15.00% |  |
Maximum fair market value of shares |  |  |  |  | $ 25,000 |  |
Purchase price of common stock, percent |  |  |  |  | 85.00% |  |
Offering period |  |  |  |  | 24 months |  |
Purchasing period |  |  |  |  | 6 months |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 1,200,000 |  |
Weighted average period of compensation cost recognized |  |  |  |  | 1 year 3 months 18 days |  |
Shares purchased under ESPP (in shares) |  |  |  |  | 333,000 | 374,000 |
Weighted-average price (in dollars per share) |  |  |  |  | $ 48.77 | $ 41.44 |
Unrecognized compensation cost |  |  |  |  | $ 4,100,000 |  |
2009 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 5,900,000 |  |
Income tax benefit from share-based compensation |  |  |  |  | $ 10,300,000 | $ 11,000,000.0 | $ 6,500,000
2009 Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 4 years |  |
Unrecognized compensation cost of unvested stock options |  |  |  |  | $ 52,700,000 |  |
Remaining weighted-average vesting period |  |  |  |  | 7 years 8 months 12 days |  |
Weighted-average fair value per share (in dollars per share) |  |  |  |  | $ 26.48 | $ 23.54 | $ 17.22
Intrinsic value of options exercised |  |  |  |  | $ 39,800,000 | $ 32,800,000 | $ 20,100,000
Weighted average period of compensation cost recognized |  |  |  |  | 2 years 9 months 18 days |  |
2009 Plan | Stock Options | Vesting One Year from Commencement Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 1 year |  |
Percentage of award vesting |  |  |  |  | 25.00% |  |
2009 Plan | Stock Options | Vesting in Equal Monthly Installments |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 36 months |  |
2009 Plan | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 4 years |  |
Weighted average period of compensation cost recognized |  |  |  |  | 3 years 1 month 6 days |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  | $ 74.52 | $ 78.49 | $ 59.52
Fair value of awards vested |  |  |  |  | $ 11,200,000 | $ 10,600,000 | $ 7,900,000
Total unrecognized compensation cost |  |  |  |  | $ 40,500,000 |  |
Awards granted (in shares) |  |  |  |  | 343,000 |  |
2009 Plan | RSUs | Vesting One Year from Commencement Date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 1 year |  |
Percentage of award vesting |  |  |  |  | 25.00% |  |
2009 Plan | RSUs | Vesting in Equal Monthly Installments |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 3 years |  |
2009 Plan | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average period of compensation cost recognized |  |  |  |  | 4 months 24 days |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  | $ 68.11 | $ 81.86 | $ 46.60
Fair value of awards vested |  |  |  |  | $ 1,400,000 | $ 1,000,000.0 | $ 1,000,000.0
Total unrecognized compensation cost |  |  |  |  | $ 500,000 |  |
Awards granted (in shares) |  |  |  |  | 21,000 |  |
2009 Plan | PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average period of compensation cost recognized |  |  |  |  | 1 year 4 months 24 days |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  | $ 82.17 | $ 73.38 | $ 38.03
Total unrecognized compensation cost |  |  |  |  | $ 5,600,000 |  |
Awards granted (in shares) |  |  |  |  | 99,000 |  |
Fair value of awards vested |  |  |  |  | $ 3,700,000 | $ 3,500,000 | $ 3,200,000
2018 Performance Based Restricted Stock Units | PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  | 36 months |  |  |  |
Percentile rank of stockholder return |  |  | 90.00% |  |  |  |
Percentage of shares eligible for time-based vesting |  |  | 100.00% |  |  |  |
Awards eligible for vesting (in shares) |  |  | 110,432 |  |  |  |
Percentage of award vesting |  |  | 25.00% |  |  |  |
Awards vested by period end (in shares) |  |  |  |  | 67,066 |  |
2019 Performance Based Restricted Stock Units | PSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) | 36 months |  |  |  |  |  |
Percentile rank of stockholder return | 70.00% |  |  |  |  |  |
Percentage of shares eligible for time-based vesting | 100.00% |  |  |  |  |  |
Awards eligible for vesting (in shares) | 61,098 |  |  |  |  |  |
Percentage of award vesting | 25.00% |  |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  | 30,548 |  |

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