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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Subscriber System Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Accounting Policies [Abstract] |  |
Gross carrying amount | $ 7,051,746 | $ 6,878,490
Accumulated depreciation | (4,136,851) | (3,897,329)
Subscriber system assets, net | $ 2,914,895 | $ 2,981,161

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- Definition Aggregate accumulated depreciation of long-lived security system assets. + References No definition available. + Details
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Namespace Prefix: | adt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross amount of long-lived, company owned, security system assets. + 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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- Definition adt_SubscriberSystemAssetsNet + References No definition available. + Details
Name: | adt_SubscriberSystemAssetsNet
Namespace Prefix: | adt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration