Segment and Geographical Information - Financial Performance of Reporting Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total cost of revenues	$ 414,979	$ 394,077	$ 378,823
Gross profit	372,330	318,637	317,085
Operating expenses	327,938	307,492	295,680
Income from operations	44,392	11,145	21,405
Automation and Analytics
Segment Reporting Information [Line Items]
Gross profit		278,498	285,944
Medication Adherence
Segment Reporting Information [Line Items]
Gross profit		40,139	31,141
Operating Segments
Segment Reporting Information [Line Items]
Revenues	787,309	712,714	695,908
Total cost of revenues	414,979	394,077	378,823
Gross profit	372,330	318,637	317,085
Operating expenses	229,733	226,592	211,715
Income from operations	142,597	92,045	105,370
Operating Segments | Automation and Analytics
Segment Reporting Information [Line Items]
Revenues	655,679	586,941	596,911
Total cost of revenues	319,257	308,443	310,967
Gross profit	336,422	278,498	285,944
Operating expenses	188,303	184,857	186,872
Income from operations	148,119	93,641	99,072
Operating Segments | Medication Adherence
Segment Reporting Information [Line Items]
Revenues	131,630	125,773	98,997
Total cost of revenues	95,722	85,634	67,856
Gross profit	35,908	40,139	31,141
Operating expenses	41,430	41,735	24,843
Income from operations	(5,522)	(1,596)	6,298
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating expenses	98,205	80,900	83,965
Product revenues
Segment Reporting Information [Line Items]
Total cost of revenues	312,360	304,842	302,437
Product revenues | Operating Segments
Segment Reporting Information [Line Items]
Revenues	569,595	510,201	527,727
Total cost of revenues	312,360	304,842	302,437
Product revenues | Operating Segments | Automation and Analytics
Segment Reporting Information [Line Items]
Revenues	462,379	407,427	433,524
Total cost of revenues	231,003	230,003	239,062
Product revenues | Operating Segments | Medication Adherence
Segment Reporting Information [Line Items]
Revenues	107,216	102,774	94,203
Total cost of revenues	81,357	74,839	63,375
Service
Segment Reporting Information [Line Items]
Total cost of revenues	102,619	89,235	76,386
Service | Operating Segments
Segment Reporting Information [Line Items]
Revenues	217,714	202,513	168,181
Total cost of revenues	102,619	89,235	76,386
Service | Operating Segments | Automation and Analytics
Segment Reporting Information [Line Items]
Revenues	193,300	179,514	163,387
Total cost of revenues	88,254	78,440	71,905
Service | Operating Segments | Medication Adherence
Segment Reporting Information [Line Items]
Revenues	24,414	22,999	4,794
Total cost of revenues	$ 14,365	$ 10,795	$ 4,481