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Leases (Future Min Schedule - Additional) (Details)
 12 Months Ended
Dec. 31, 2014
Minimum [Member]  
Capital Lease Interest Rate Range [Line Items]  
Capital lease interest rates 2.70%amsg_CapitalLeaseInterestRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Capital Lease Interest Rate Range [Line Items]  
Capital lease interest rates 11.80%amsg_CapitalLeaseInterestRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember