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Restructuring - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Total Costs Incurred $ 10,311us-gaap_RestructuringAndRelatedCostCostIncurredToDate1  
Restructuring Reserve [Roll Forward]    
Accrued Balance at December 31, 2014 531us-gaap_RestructuringReserve  
Expensed (60)us-gaap_RestructuringCharges 776us-gaap_RestructuringCharges
Paid and Other (135)us-gaap_PaymentsForRestructuring  
Accrued Balance at March 31, 2015 336us-gaap_RestructuringReserve  
Social Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Total Costs Incurred 9,390us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringCostAndReserveAxis
= atec_SocialPlanMember
 
Restructuring Reserve [Roll Forward]    
Accrued Balance at December 31, 2014 531us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= atec_SocialPlanMember
 
Expensed (60)us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= atec_SocialPlanMember
 
Paid and Other (135)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= atec_SocialPlanMember
 
Accrued Balance at March 31, 2015 336us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= atec_SocialPlanMember
 
Other Restructuring [Member]    
Restructuring Cost and Reserve [Line Items]    
Total Costs Incurred 921us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
 
Restructuring Reserve [Roll Forward]    
Accrued Balance at December 31, 2014 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
 
Expensed 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
 
Paid and Other 0us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
 
Accrued Balance at March 31, 2015 $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember