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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Income tax benefit $ 22,848 $ 4,571 $ 45,209 $ 12,139
Effective tax rate 18.00% 6.40% 21.00% 5.10%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 21.00%
adt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFinancialInstrumentsSubjecttoMandatoryRedemptionPercent   14.60%    
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.40% 7.40% 1.80%  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent   4.10%    
Preferred securities, tax impact       12.10%
Share-based compensation cost, tax impact       16.40%
Prior year taxes, tax impact     (1.20%) (11.40%)