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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

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
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