Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Narrative (Details)

v3.10.0.1
Goodwill - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill [Line Items]            
Loss on goodwill impairment   $ 0   $ 0 $ 214,400 $ 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  
MONI | Measurement Input, Discount Rate | Valuation, Income Approach            
Goodwill [Line Items]            
Percentage of fair value in excess of carrying amount   8.50%     8.50%  
LiveWatch            
Goodwill [Line Items]            
Loss on goodwill impairment         $ 0  
Reporting unit reallocated from segment $ 36,047       $ 36,047  
LiveWatch | Measurement Input, Discount Rate | Valuation, Income Approach            
Goodwill [Line Items]            
Percentage of fair value in excess of carrying amount   8.50%     8.50%