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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 1,304,417 $ 1,331,387 $ 2,609,121 $ 2,701,139
CSB        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 1,022,647 1,102,186 2,061,252 2,213,353
Commercial        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 281,770 229,201 547,869 487,786
Monitoring and related services        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 1,083,520 1,041,379 2,146,286 2,087,336
Monitoring and related services | CSB        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 965,233 935,957 1,916,481 1,873,989
Monitoring and related services | Commercial        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 118,287 105,422 229,805 213,347
Installation and other        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 220,897 290,008 462,835 613,803
Installation and other | CSB        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue 57,414 166,229 144,771 339,364
Installation and other | Commercial        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 163,483 $ 123,779 $ 318,064 $ 274,439