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Employee Benefits and Share-Based Compensation - 401(k) Plan (Details) - Other Postretirement Benefit Plan - Omnicell Plan - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employee contribution	50.00%
Maximum amount of employer contribution	$ 2,500
401(k) contributions	$ 3,800,000	$ 1,900,000	$ 1,800,000

X

- Definition

Defined Contribution Plan, Employer Matching Contribution, Maximum Contribution

+ References

No definition available.

+ Details

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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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- Details

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