Commitments and Contingencies (Details) (USD $)	3 Months Ended
Mar. 31, 2014 Y
Business Combination, Contingent Consideration Arrangements [Abstract]
Contractual Obligation Term	15
Contractual Obligation Lease Square Footage	110,000
Contractual Obligation Annual Rental Payment	$ 2,300,000
Contractual Obligation Annual Rental Payment Increase	1.90%
Contractual Obligation Maximum Tenant Allowance	$ 4,400,000

- Definition

The approximate amount of annual rental obligations stated in the executed lease for the Company's future corporate headquarters expecetd to commence in 2015.

+ References

No definition available.

+ Details

Name:	amsg_ContractualObligationAnnualRentalPayment
Namespace Prefix:	amsg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fixed percentage amount of the annual rent increase stated in the executed lease for the Company's future corporate headquarters expected to commence in 2015.

+ References

No definition available.

+ Details

Name:	amsg_ContractualObligationAnnualRentalPaymentIncrease
Namespace Prefix:	amsg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated rental square footage stated in the executed lease for the Company's future corporate headquarters expected to commence in 2015.

+ References

No definition available.

+ Details

Name:	amsg_ContractualObligationLeaseSquareFootage
Namespace Prefix:	amsg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum allowable amount of tenant improvement allowances stated in the executed lease for the Company's future corporate headquarters expected to commence in 2015.

+ References

No definition available.

+ Details

Name:	amsg_ContractualObligationMaximumTenantAllowance
Namespace Prefix:	amsg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of years in the initial term of the executed lease for the Company's future corporate headquarters expected to commence in 2015.

+ References

No definition available.

+ Details

Name:	amsg_ContractualObligationTerm
Namespace Prefix:	amsg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration