Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 112,034	$ 111,291	$ 111,803	$ 103,979	$ 103,603	$ 100,013	$ 101,360	$ 94,496	$ 439,107	$ 399,472	$ 286,776
Gross profit	69,917	69,339	70,240	64,778	63,946	62,737	65,755	58,048	274,274	250,486	172,370
Net income/(loss)	1,576	8,283	8,300	11,685	10,393	16,001	10,444	5,036	52,751	49,814	(1,763)
Net income/(loss) attributable to BioTelemetry, Inc.	$ 1,576	$ 8,283	$ 8,300	$ 11,685	$ 10,393	$ 16,001	$ 10,444	$ 5,982	$ 29,844	$ 42,820	$ (15,956)
Basic net income/(loss) per share attributable to BioTelemetry, Inc.	$ 0.05	$ 0.24	$ 0.25	$ 0.35	$ 0.31	$ 0.48	$ 0.32	$ 0.18	$ 0.88	$ 1.31	$ (0.53)
Diluted net income/(loss) per share attributable to BioTelemetry, Inc.	$ 0.04	$ 0.23	$ 0.23	$ 0.32	$ 0.29	$ 0.45	$ 0.29	$ 0.17	$ 0.82	$ 1.20	$ (0.53)