Label	Element	Value
Parent [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ 986,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss) Due to Settlements, Net of Tax	atus_OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIPensionandOtherPostretirementBenefitPlansforNetGainLossDuetoSettlementsNetofTax	10,748,000
AOCI Attributable to Parent [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	986,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss) Due to Settlements, Net of Tax	atus_OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIPensionandOtherPostretirementBenefitPlansforNetGainLossDuetoSettlementsNetofTax	$ 10,748,000