Amendment fee.

No definition available.

Name:	aimc_AmendmentFee
Namespace Prefix:	aimc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Coupon interest rate.

+ References

No definition available.

+ Details

Name:	aimc_CouponInterestRate
Namespace Prefix:	aimc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument interest rate.

+ References

No definition available.

+ Details

Name:	aimc_DebtInstrumentInterestRate
Namespace Prefix:	aimc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate mortgage.

+ References

No definition available.

+ Details

Name:	aimc_InterestRateMortgage
Namespace Prefix:	aimc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility additional borrowing capacity.

+ References

No definition available.

+ Details

Name:	aimc_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	aimc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Principal amount of notes.

+ References

No definition available.

+ Details

Name:	aimc_PrincipalAmountOfNotes
Namespace Prefix:	aimc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Redemption of debt.

+ References

No definition available.

+ Details

Name:	aimc_RedemptionOfDebt
Namespace Prefix:	aimc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Surrender of notes for conversion end date.

+ References

No definition available.

+ Details

Name:	aimc_SurrenderOfNotesForConversionEndDate
Namespace Prefix:	aimc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

+ References

+ Details

Name:	us-gaap_BankOverdrafts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans.

+ References

+ Details

Name:	us-gaap_ConstructionLoan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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(22))
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
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-SubTopic 10
-Section 50
-Paragraph 7
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-SubTopic 10
-Section 50
-Paragraph 3
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

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

- Definition

Amount of the required periodic payments applied to interest.

+ References

+ Details

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

- Definition

End date of debt instrument redemption period, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodEndDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 50
-Section 40
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of mortgage loan on real estate that was renewed or extended.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateRenewedAndExtendedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementGeographicalAxis=country_SK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=aimc_MulticurrencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=aimc_HeidelbergGermanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=aimc_EsslingenGermanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=aimc_AngersFranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aimc_A2015CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Balance Type:
Period Type:

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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
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Period Type:

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Long-Term Debt - Additional Information (Detail)						1 Months Ended		3 Months Ended	12 Months Ended
Long-Term Debt - Additional Information (Detail)	Dec. 31, 2016 USD ($) shares	Dec. 12, 2016 USD ($)	Oct. 21, 2016 USD ($)	Oct. 22, 2015 USD ($)	Sep. 01, 2011 USD ($)	Jan. 31, 2017 USD ($) shares	Mar. 31, 2011	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)	Dec. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)
Debt Instrument [Line Items]
Loss on extinguishment of convertible debt									$ 1,797,000	$ 1,989,000
Carrying amount of financial instruments	$ 325,969,000								275,587,000	325,969,000
Borrowings under overdraft agreements	0								$ 0	0
Zlate Moravce, Slovakia [Member]
Debt Instrument [Line Items]
Interest rate									1.95%
Description about maturity date of debt instrument									The loan is due in installments through 2020
Loan amount principal outstanding	2,600,000								$ 2,300,000	$ 2,600,000			€ 1,900,000	€ 2,500,000
Line of Credit [Member] \| Multicurrency [Member]
Debt Instrument [Line Items]
Availability under credit facility agreement			$ 250,000,000
Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Mar. 01, 2031
Coupon interest rate					2.75%
Proceeds from the offering					$ 81,300,000
Notes redemption date									Jan. 12, 2017	Jan. 12, 2017
Percentage of convertible notes redeemable										100.00%
Surrender of notes for conversion end date									Jan. 09, 2017	Jan. 09, 2017
Conversion of notes into shares (in shares)		0.390809
Principal amount of notes		$ 1,000
Conversion of notes into shares, amount	$ 39,300,000					$ 44,700,000
Conversion of notes into shares (in shares) \| shares	1,500,000					1,700,000				1,500,000
Loss on extinguishment of convertible debt	$ 1,900,000							$ 1,800,000		$ (1,900,000)
Carrying amount of financial instruments	42,900,000									42,900,000
Redemption of debt						$ 900,000
Mortgages [Member] \| Heidelberg Germany [Member]
Debt Instrument [Line Items]
Interest rate									1.79%
New mortgage amount	1,400,000								$ 1,400,000	1,400,000	$ 1,700,000		1,100,000	1,300,000		€ 1,500,000
Description about maturity date of debt instrument									The mortgage has an interest rate of 1.79% which is payable in monthly installments through August 2023
Mortgages [Member] \| Esslingen Germany [Member]
Debt Instrument [Line Items]
Construction loan	6,300,000								$ 7,100,000	6,300,000	$ 6,700,000		6,000,000	6,000,000		6,000,000
Mortgage interest rate											2.50%	2.50%
Monthly installments											$ 100,000	€ 100,000
Mortgages [Member] \| Angers France [Member]
Debt Instrument [Line Items]
Interest rate									1.85%
Construction loan	2,000,000								$ 2,000,000	2,000,000	$ 2,300,000		€ 1,700,000	€ 1,900,000		€ 2,000,000
Capital Leases [Member]
Debt Instrument [Line Items]
Principal amount of debt									200,000						$ 400,000
2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amendment fee included in other non-current assets			600,000
2015 Credit Agreement [Member] \| Line of Credit [Member] \| 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Availability under credit facility agreement				$ 350,000,000											$ 425,000,000
Debt instrument, maturity date				Oct. 22, 2020
Credit facility additional borrowing capacity			$ 75,000,000						150,000,000
Outstanding on revolving credit facility									262,900,000
Amount available under credit facility									158,600,000
2015 Credit Agreement [Member] \| Line of Credit [Member] \| 2015 Revolving Credit Facility [Member] \| Minimum [Member] \| Eurodollar Loan [Member]
Debt Instrument [Line Items]
Applicable margins for loans				1.25%
2015 Credit Agreement [Member] \| Line of Credit [Member] \| 2015 Revolving Credit Facility [Member] \| Minimum [Member] \| ABR Based Loans [Member]
Debt Instrument [Line Items]
Applicable margins for loans				0.25%
2015 Credit Agreement [Member] \| Line of Credit [Member] \| 2015 Revolving Credit Facility [Member] \| Maximum [Member] \| Eurodollar Loan [Member]
Debt Instrument [Line Items]
Applicable margins for loans				2.00%
2015 Credit Agreement [Member] \| Line of Credit [Member] \| 2015 Revolving Credit Facility [Member] \| Maximum [Member] \| ABR Based Loans [Member]
Debt Instrument [Line Items]
Applicable margins for loans				1.00%
2015 Credit Agreement [Member] \| Line of Credit [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit outstanding	$ 4,100,000								3,500,000	$ 4,100,000
2015 Credit Agreement [Member] \| Domestic Line of Credit [Member] \| 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding on revolving credit facility									$ 242,000,000
Interest rate									3.07%
2015 Credit Agreement [Member] \| Foreign Line of Credit [Member] \| 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding on revolving credit facility									$ 20,900,000
Interest rate									1.57%