Goodwill and other intangible assets, net - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 132,252	$ 142,674
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	93,277	100,869
Trade names
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	18,453	19,626
Patents
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	7,012	7,673
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	7,186	8,070
Developed technology
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	5,887	5,980
Other
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 437	$ 456