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Summary of Significant Accounting Policies (Summary of Self-Insured Claims) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of Significant Accounting Policies |  |  |
Amount retained, individual claims | $ 350,000 |  |
Amount retained, aggregate claims | 1,900,000 |  |
Actuarially Determined Self-insurance Expense | 1,200,000 | $ 1,000,000 | $ 800,000
Self-insurance Claims Liability | $ 2,700,000 | $ 2,200,000 |

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- Definition Represents the self-insurance expense determined using and actuary. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of risk retained by the reporting entity for self-insured workers compensation aggregate claims annually. + References No definition available. + Details
Name: | amph_WorkersCompensationInsuranceRiskRetainedAggregateClaims
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of risk retained by the reporting entity for self-insured workers compensation individual claims annually. + References No definition available. + Details
Name: | amph_WorkersCompensationInsuranceRiskRetainedIndividualClaims
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant