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Basis of Presentation and Summary of Significant Accounting Policies - Subscriber System Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2021 | Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Revenue from Contract with Customer, Term of Customer Relationship | 15 years |
Gross carrying amount | $ 5,148,559 | $ 4,815,286
Accumulated depreciation | (2,386,962) | (2,152,058)
Subscriber system assets, net | $ 2,761,597 | $ 2,663,228

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- Definition Aggregate accumulated depreciation of long-lived security system assets. + References No definition available. + Details
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- Definition Gross amount of long-lived, company owned, security system assets. + References No definition available. + Details
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