Annual report pursuant to Section 13 and 15(d)

Goodwill - Narrative (Details)

v3.20.4
Goodwill - Narrative (Details) - USD ($)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Goodwill [Line Items]        
Goodwill impairment $ 0 $ 0 $ 81,943 $ 563,549
Valuation Technique, Discounted Cash Flow | Brinks Home Security | COVID-19 Pandemic        
Goodwill [Line Items]        
Goodwill impairment     $ 81,943