Goodwill and other intangible assets, net - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 121,978	$ 142,674
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	85,686	100,869
Trade names
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	17,280	19,626
Patents
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	6,351	7,673
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	6,453	8,070
Developed technology
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	5,793	5,980
Other
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 415	$ 456