Employee Benefits and Share-Based Compensation - 401(k) Plan (Details) - Other Postretirement Benefit Plan - Omnicell Plan - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employee contribution	50.00%
Maximum amount of employer contribution	$ 3,000
401(k) contributions	$ 4,600,000	$ 3,800,000	$ 1,900,000

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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Balance Type:	debit
Period Type:	duration