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Revenue Recognition (Analysis of the Chargeback Provision) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue Recognition
Beginning balance	$ 15,217	$ 11,872
Provision related to sales made in the current period	32,548	42,372
Credits issued to third parties	(36,703)	(42,909)
Ending balance	$ 11,062	$ 11,335

X

- Definition

Represents the amount the Company agrees to reimburse wholesalers for differences between the gross sales prices, at which the Company sells its products to wholesalers and the actual prices of such products at the time wholesalers resell them under the Company’s various contractual arrangements with third parties such as hospitals and group purchasing organizations.

+ References

No definition available.

+ Details

Name:	amph_RevenueRecognitionWholesalerChargebacks
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents wholesaler chargeback credits issued to third parties during the period.

+ References

No definition available.

+ Details

Name:	amph_RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the wholesaler chargeback provision related to sales made in the current period.

+ References

No definition available.

+ Details

Name:	amph_RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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