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Description of Business and Summary of Significant Accounting Policies - Subscriber System Assets and Depreciation Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Gross carrying amount | $ 5,499,703 | $ 4,815,286 |
Accumulated depreciation | (2,632,175) | (2,152,058) |
Subscriber system assets, net | 2,867,528 | 2,663,228 |
Depreciation of subscriber system assets | 506,568 | 501,669 | $ 558,111
Amortization of deferred subscriber acquisition costs | $ 126,089 | $ 96,823 | $ 80,128

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- Definition Aggregate accumulated depreciation of long-lived security system assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Subscriber System Assets, Amortization Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Subscriber System Assets, Depreciation Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Gross amount of long-lived, company owned, security system assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition adt_SubscriberSystemAssetsNet + References No definition available. + Details
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Namespace Prefix: | adt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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