Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended
Dec. 27, 2012 sqft Y	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation term	15
Lease square footage	110,000
Annual rental obligation		$ 2.3
Annual increase to annual rental obligation		1.90%
Allowance for certain interior tenant improvements		$ 4.4

- Definition

The approximate amount of annual rental obligations stated in the executed lease for the Company's future corporate headquarters expected 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:	num:areaItemType
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:	credit
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_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration