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Basis of Presentation and Summary of Significant Accounting Policies - Subscriber System Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Gross carrying amount | $ 3,891,719 | $ 3,762,905
Accumulated depreciation | (1,001,074) | (870,222)
Subscriber system assets, net | $ 2,890,645 | $ 2,892,683

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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 Subscriber System Assets, Net + 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_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration