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401(k) savings plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
401(k) savings plan [Abstract]
Matching of qualified deferrals by employer, maximum	50.00%
Percentage of employee's gross salary subject to employer's matching contribution	6.00%
Matching contributions made by employer	$ 2.7	$ 2.5	$ 2.2

X

- Definition

Percentage of the employee's gross salary that is subject to employer's matching contribution.

+ References

No definition available.

+ Details

Name:	ebs_DefinedContributionPlanPercentageOfEmployeeGrossSalarySubjectToEmployerMatching
Namespace Prefix:	ebs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration