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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