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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, 2019 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Revenue from Contract with Customer, Term of Customer Relationship | 15 years |
Gross carrying amount | $ 4,599,997 | $ 4,304,279
Accumulated depreciation | (1,670,485) | (1,396,578)
Subscriber system assets, net | $ 2,929,512 | $ 2,907,701

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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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