Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Narrative (Details)

v3.10.0.1
Goodwill - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill [Line Items]        
Reporting unit reallocated from segment     $ 0  
Loss on goodwill impairment $ 214,400,000 $ 0 214,400,000 $ 0
MONI        
Goodwill [Line Items]        
Reporting unit reallocated from segment     313,102,000  
Loss on goodwill impairment     214,400,000  
LiveWatch        
Goodwill [Line Items]        
Reporting unit reallocated from segment     36,047,000  
Loss on goodwill impairment     $ 0  
Valuation, Income Approach | Measurement Input, Discount Rate | MONI        
Goodwill [Line Items]        
Percentage of fair value in excess of carrying amount 8.50%   8.50%  
Valuation, Income Approach | Measurement Input, Discount Rate | LiveWatch        
Goodwill [Line Items]        
Percentage of fair value in excess of carrying amount 8.50%   8.50%