Annual report pursuant to Section 13 and 15(d)

Goodwill - Narrative (Details)

v3.19.1
Goodwill - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2018
Goodwill [Line Items]              
Loss on goodwill impairment       $ 563,549 $ 0 $ 0  
Reporting unit reallocated from segment       0      
MONI              
Goodwill [Line Items]              
Loss on goodwill impairment     $ 214,400 214,400      
Reporting unit reallocated from segment $ 313,102     313,102      
LiveWatch              
Goodwill [Line Items]              
Loss on goodwill impairment       0      
Reporting unit reallocated from segment $ 36,047     36,047      
Brinks Home Security              
Goodwill [Line Items]              
Loss on goodwill impairment   $ 349,149   349,149      
Reporting unit reallocated from segment       $ (349,149)      
Valuation, Income Approach | Measurement Input, Discount Rate | MONI              
Goodwill [Line Items]              
Percentage of fair value in excess of carrying amount             8.50%
Valuation, Income Approach | Measurement Input, Discount Rate | LiveWatch              
Goodwill [Line Items]              
Percentage of fair value in excess of carrying amount             8.50%
Valuation, Income Approach | Measurement Input, Discount Rate | Brinks Home Security              
Goodwill [Line Items]              
Percentage of fair value in excess of carrying amount   8.50%   8.50%